HomeMy WebLinkAboutExhibit BEXHIBIT "B"
MIAMI DADE COUNTY FLOOD MITIGATION PROGRAM
C-4 BASIN
C-4 BASIN OPERATION PLAN
Prepared by:
South Florida Water Management District
July 2024
July 2024
C4 Basin Operation Plan
C-4 BASIN OPERATION PLAN STRUCTURE REFERENCE
Structure
ID
Structure Type
[High x Wide]
FunctionContaining
ii
Design
Capacity
(cfs)
Design Headwater and
Tailwater
[feet NAVD (feet
NGVD)]
Emergency
Back-up Power
Operation
Type
Page
Description
Notes
G-93
Two 5-foot x 10-foot
gated spillway
Flood Protection;
salinity control
2@320
Total: 640
HW = 3.0 (4.5)
TW = 1.5 (3.0)
LP gas powered
generator
Local &
Remote
3
G 119
Two 72 inch CMP
Gated culvert
Water Supply
2@100
Total: 200
HW = 2.7 (4.2)
TW = 2.2 (3.7)
N/A
Local
4
G-420
Pump station
C-4 Detention Basin
Inflow
3@223
Total: 670
N/A
Onan diesel
generator
Local &
Remote
5
G-420S
Pump station
C-4 Detention Basin
Seepage Pump
1@100
Total: 100
N/A
N/A
Local &
Remote
5
G-421
One 5-foot x 20-foot
gated spillway
C-4 Detention Basin
Outflow
N/A
N/A
N/A
Local &
Remote
5
G-422
Pump station
C-4 Detention Basin
Inflow
7@89
Total: 623
HW = N/A
TW = 8.4 (10)
Onan diesel
generator
Local &
Remote
6
G-423
Six 5-foot x 10-foot
gated box culverts
Inter -Cell flow
transfer
N/A
N/A
N/A
Local &
Remote
6
S-22
Two 15 foot x 17-
foot
gated spillway
C-2 (Snapper
Creek)
Total: 1915
HW = 2.0 (3.5)
TW = 1.2 (2.7)
LP gas powered
generator
Local &
Remote
3
S-25B
Two 11.9 foot x 22
foot
gated spillway
Flood Protection;
salinity control
2000
HW = 2.85 (4.4)
TW = 2.55 (4.1)
LP gas powered
generator
Local &
Remote
4
S-25B
Forward
Pump
Pump station
Flood Protection
600
N/A
Onan diesel
generator
Local &
Remote
4
S-26
Two 14.1 foot x 26
foot
gated spillway
Flood Protection;
salinity control
3,470
HW = 2.9 (4.4)
TW = 2.4 (2.9)
LP gas powered
generator
Local &
Remote
5
1
July 2024
C4 Basin Operation Plan
C-4 BASIN OPERATION PLAN STRUCTURE REFERENCE
Structure
ID
Structure Type
[High x Wide]
Function
Design
Capacity
(cfs)
Design Headwater and
Tailwater
[feet NAVD (feet
NGVD)]
Emergency
Back-up Power
Operation
Type
Page
Containing
Description
Notes
S-26
Forward
Pump
Pump station
Flood Protection
600
N/A
Onan diesel
generator
Local &
Remote
5
S-380
Five 72 inch CMP
Gated culvert
Seepage Reduction
and Water Supply
Total:400
N/A
LP gas powered
generator
Local &
Remote
4
cfs = cubic feet per second
cmp = corrugated metal pipe
HW = headwater
N/A = Not Applicable
NAVD = North American Vertical Datum of 1988
NGVD = National Geodetic Vertical Datum of 1929
TW = tailwater
11
July 2024
C4 Basin Operation Plan
Table of Contents
1. BACKGROUND 1
2. OBJECTIVES 1
3. SYSTEM COMPONENTS 3
3.1 C-2 Canal Structures 3
3.1.1 S-22 3
3.2 C-3 Canal Structures 3
3.2.1 G-93 3
3.3 C-4 Canal Structures 4
3.3.1 G-119 4
3.3.2 S-380 4
3.3.3 S-25B 4
3.3.4 S-25B Forward Pumps 4
3.4 C-6 Canal Structures 4
3.4.1 S-26 4
3.4.2 S-26 Forward Pumps 5
3.5 C-4 Detention Basin Structures 5
3.5.1 G-420 5
3.5.2 G-420S 5
3.5.3 G-421 5
3.5.4 G-422 5
3.5.5 G-423 5
4. OPERATING PLAN FOR C-4 BASIN 6
APPENDIX 1 - WATER CONTROL STRUCTURES INFORMATION 9
July 2024
C4 Basin Operation Plan
List of Tables
TABLE 1 STAGE MONITORING SITES 1
List of Figures
FIGURE 1: C-4 BASIN COMPONENTS 2
FIGURE 2: C-4 EMERGENCY DETENTION BASIN MONITORING STATIONS 8
ii
1. BACKGROUND
The C-4 Basin in Miami -Dade County has historically experienced frequent flooding during the wet season.
Widespread flooding during Hurricane Irene (1999) and the unnamed storm in October of 2000 prompted
the development of a series of flood mitigation projects including the installation of forward pumps at tidal
outlets, and back -pumping capability for excess runoff from local municipalities into a western detention
facility — the C-4 Emergency Detention Basin (EDB). The purpose of the C-4 Emergency Impoundment
Project is to provide a storage basin and additional structures to reduce the level of flooding in Miami -Dade
County during heavy rainfall events. With the implementation of flood mitigation projects for the C-4
Basin, it is necessary to periodically update the C-4 Basin Operation Plan (the Plan) to provide guidelines
for the District and affected municipalities so as to assist in achieving the benefits afforded by the improving
system. This plan is an update to the 2019 interim plan to take into account project components currently
in place. Installation of turning vanes in the inflow canal upstream of G420, installation of new
suction bells at G420, and removal of concrete barrier walls around the G420S seepage pump were
completed in December 2021.
2. OBJECTIVES
It is necessary to make clear that the projects implemented as part of this program will not provide the full
level of flood protection that would be ideal for the local communities, namely the ability to handle a 100
year storm frequency without flooding finished floors. Nevertheless, the projects will have the potential to
increase the current level of flood protection in the affected communities.
The objective of the Plan is to develop guidelines which will assist in achieving the benefits afforded by
the improved system. In order to do this, the system must be operated in a way that is most effective for
all communities served by the C-4. It is important that emergency components, such as the EDB, not be
operated more often than necessary since early filling of the EDB could make it unavailable for receiving
additional water if the storm event is prolonged. Additionally, the systems must be operated so as not to
adversely impact other communities along the C-4 Canal and the Miami River. Therefore, these structures
will be operated based on stages within the canal system and the EDB. Stages are monitored in real time
via telemetry at several locations, including those identified in the table below.
Table 1 Stage Monitoring Sites
Project Component
Stage Monitoring Station
Description
C-4 Canal
T5W
Near the Turnpike.
C4 Coral
Near Palmetto Expressway.
S-25B
Structure S-25B.
Emergency Detention Basin
G-420
Inflow pump station.
G-422
Inflow pump station.
C4EDBSW
Inside Emergency Detention Basin
Miami River
MRMS1
South of intersection of C-4 Canal and
Miami River.
These stage monitoring stations and others are shown on Figure 1.
1
S31
47ELD CAN,4�
G72
DReSSFI O44RYCANA4
NORTH LINE CANAL
NORTH LINE CANAL
J
z
S335 G423 n
,rmGal G420S e
G420 w1 J
1.9 G11S380 G421 E
h+� GL4 G422 cl
C-4 Detention Basin
S717 r. -
r,l
Area shown
y7
on main map ' rl
LOCATION MAP
C-4
S120
July 2024
C4 Basin Operation Plan
Legend
i Stage Mon€tor Site
• CULVERT
B FLUME
• LOCK
b PUMP
M SPILLWAY
• WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
• Sweetwater(SWE)
City of Miami (CITMIA)
West Miami (WMI)
S2513
S25A I
C-4 Summary
4 Miles
4
IMPORTANT DISCLAIM.'
Tr mac s arena actual er planning tent anly The 5e1.11M1 Marina Water
Management m t does not guaranke or mn make an representation
inlo
regarding the Inknnation contained herein. II Is not self-execullnp or
binding, anddoes not affect the interests of any persons or properties,
including any present or CAP re tight use of real property,
6 Kilometers July 2019
IT
GEOSPRTIRL
SERVICES
user Name:Iwu
Remedy Ticket 66058416 Map Produced on Dale: 1/171201910:00:29 AM Itad.SFMtd.gov1dfarca11G51G5BIZWESMIFEMA SFHAIFEMA SFHA_201Z.mvd
Figure 1: C-4 Basin Components
2
July 2024
C4 Basin Operation Plan
3. SYSTEM COMPONENTS
The C-4 Basin consists of a main canal: the C-4 Canal; associated lateral discharge canals that have an open
connection to the C-4 Canal: C-2 Canal (Snapper Creek), and the C-3 Canal (Coral Gables); and a series of
original structures with flood protection and water supply functions: G-119, S-380, S-25B, G-93 (C-3
Canal) and S-22 (C-2 Canal) all of which are shown on Figure 1.
The new structures in the system, added as part of this program, include the S-25B Forward Pump Station,
S-26 Forward Pump Station, G-420 Pump Station, G420 Seepage Pump, G-421 Outlet Spillway, G-422
Inflow Pump Station, and G-423 Inter -cell Transfer Structure.
Historically, the system discharges to the east through the C-4 Canal, which in turn discharges into the
Miami River and Biscayne Bay. Discharges from the C-4 into the Miami River are mostly through the S-
25B gated spillway structure. C-4 is open connected to C-2 and C-3. When conveyance capacity is
available, additional discharges from the C-4 Canal are routed to the ocean through the C-2 Canal (Snapper
Creek) and structure S-22, and through the C-3 Canal (Coral Gables) and structure G-93. (Reference Figure
1 for locations).
The additional components of the system are also shown in Figure 1 and include the following:
• S-25B Forward Pump Station
• S-26 Forward Pump Station
• C-4 Emergency Detention Basin Phase I which includes the G-420 Inflow Structure and G-421 Outlet
Spillway
• C-4 Emergency Detention Basin Phase II including G-422 Inflow Pump Station and G-423 Inter -Cell
Transfer Structure
3.1 C-2 Canal Structures
3.1.1 S-22
S-22 consists of two (2) 15 feet high by 17 feet wide cable operated vertical lift gates. It is designed to
provide approximately 1,905 cfs of flow capacity. The design capacity of S-22 is based on a headwater
stage of 2.0 feet NAVD (+3.5 feet NGVD) and a tailwater stage of +1.2 feet NAVD (+2.7 feet NGVD).
The discharge from the structure is controlled by an electric driven cable drum operated vertical lift gate.
The gates can either be remotely operated from the SFWMD Operation Control Center or controlled on -
site. S-22 is equipped with L.P. gas driven generator as emergency back-up power. S-22 structure details
are provided in Appendix 1.
3.2 C-3 Canal Structures
3.2.1 G-93
G-93 consists of two (2) 5 feet high by 10 feet wide cable operated vertical lift gates. It is designed to
provide approximately 640 cfs of flow capacity. The design capacity of G-93 is based on a headwater stage
of 2.9 feet NAVD (+4.5 feet NGVD) and a tailwater stage of +1.4 feet NAVD (+3.0 feet NGVD). The
discharge from the structure is controlled by two (2) stem operated vertical lift roller gates. The gates can
either be remotely operated from the SFWMD Operation Control Center or controlled on -site. G-93 is
3
July 2024
C4 Basin Operation Plan
equipped with L.P. gas driven generator as emergency back-up power. G-93 structure details are provided
in Appendix 1.
3.3 C-4 Canal Structures
3.3.1 G-119
G-119 consists of two (2) 72 inch CMP culverts with the invert elevation of the culvert barrels at -5.0 feet
NAVD (-3.5 NGVD). It is designed to provide approximately 200 cfs of flow capacity. The design capacity
of G-119 is based on a headwater stage of 2.6 feet NAVD (+4.2 feet NGVD) and a tailwater stage of +2.1
feet NAVD (+3.7 feet NGVD). Control is affected by (2) two manually operated 6.0 feet square sluice gates
mounted on a frame on the upstream or west end of the structure. G-119 does not require emergency power.
G-119 structure details are provided in Appendix 1.
3.3.2 S-380
S-380 is a five (5) 72 inch CMP culvert located in the C-4 (Tamiami) Canal. It has the design capacity of
400 cfs. Contml is affected by single stem sluice gates mounted on a frame on the upstream (west end of
the structure). The gates can either be remotely operated from the SFWMD Operation Control Center or
controlled on -site. S-380 is equipped with L.P. gas driven generator as emergency back-up power. S-380
structure details are provided in Appendix 1.
3.3.3 S-25B
S-25B consists of two (2) 11.9 feet high by 22.8 feet wide hydraulically driven cable operated vertical lift
gates. It is designed to provide approximately 2,000 cfs of flow capacity. The design capacity of S-25B is
based on a headwater stage of 2.8 feet NAVD (+4.4 feet NGVD) and a tailwater stage of +2.5 feet NAVD
(+4.1 feet NGVD). The discharge from the structure is controlled by two (2) hydraulically driven cable
operated vertical lift gates. The gates can either be remotely operated from the SFWMD Operation Control
Center or controlled on -site. S-25B is equipped with L.P. gas driven generator as emergency back-up power.
S-25B structure details are provided in Appendix 1.
3.3.4 S-25B Forward Pumps
Structure S-25B Pump is a reinforced concrete, electric pump station, with discharge controlled by three
(3) 200 cfs operated pumps. The pumps can either be remotely operated from the SFWMD Operation
Control Center or controlled on -site. This structure is operated in coordination with the adjacent S-25B
spillway. S-25B Forward Pumps are equipped with Onan diesel generator as emergency back-up power.
S-25B Forward Pumps structure details are provided in Appendix 1.
3.4 C-6 Canal Structures
3.4.1 S-26
S-26 consists of two (2) 14.1 feet high by 26 feet wide hydraulically driven cable operated vertical lift gates.
It is designed to provide approximately 3,470 cfs of flow capacity. The design capacity of S-26 is based on
a headwater stage of 2.9 feet NAVD (+4.4 feet NGVD) and a tailwater stage of +2.4 feet NAVD (+3.9 feet
NGVD). The discharge from the structure is controlled by two (2) hydraulically driven cable operated
vertical lift gates. The gates can either be remotely operated from the SFWMD Operation Control Center
4
July 2024
C4 Basin Operation Plan
or controlled on -site. S-26 is equipped with L.P. gas driven generator as emergency back-up power. S-26
structure details are provided in Appendix 1.
3.4.2 S-26 Forward Pumps
Structure S-26 Pump is a reinforced concrete, electric pump station, with discharge controlled by three (3)
200 cfs operated pumps. The pumps can either be remotely operated from the SFWMD Operation Control
Center or controlled on -site. This structure is operated in coordination with the adjacent S-26 spillway. S-
26 Forward Pumps are equipped with Onan diesel generator as emergency back-up power. S-26 Forward
Pumps structure details are provided in Appendix 1.
3.5 C-4 Detention Basin Structures
3.5.1 G-420
The G-420 is a three -unit diesel pump station with total capacity of 670 cfs. G-420 is to pump water from
C-4 into the C-4 EDB for flood control. The pumps can either be remotely operated from the SFWMD
Operation Control Center or controlled on -site. G-420 does not require backup emergency power. Pump G-
420 structure details are provided in Appendix 1.
3.5.2 G-420S
G-420S seepage pump consists of a 100-cfs submersed electric pump. G-420S seepage pump is to
recirculate water collected in the seepage collection canal. The pumps can either be remotely operated from
the SFWMD Operation Control Center or controlled on -site. G-420S does not require backup emergency
power. Pump G-420S structure details are provided in Appendix 1.
3.5.3 G-421
G-421 consists of one (1) 4 feet high by 20 feet wide cable operated vertical lift gate. G-421 is used to
release water from the EDB basin back to the C-4 after the storm event has passed. The gate can either be
remotely operated from the SFWMD Operation Control Center or controlled on -site and does not require
emergency backup power. G-421 structure details are provided in Appendix 1.
3.5.4 G-422
The G-422 is a seven -unit electric pump station with total capacity of 623 cfs. G-422 is to pump water from
C-4 Canal into the southern cell of the EDB for flood control. The pumps can either be remotely operated
from the SFWMD Operation Control Center or controlled on -site. G-422 is equipped with two 450 KW
and one 200 KW Onan diesel generator as emergency back-up power. Pump G-422 structure details are
provided in Appendix 1.
3.5.5 G-423
Structure G-423 is located at C-4 EDB. It is the control structure between northern and southern cells of C-
4 EDB. This structure is used to transfer water between the north and south cells as needed. G-423 consists
of six 5-feet high by 10-feet wide reinforced concrete box culverts approximately 30 feet long. The invert
elevation of each culvert is 3.4 feet NAVD (5.0 feet NGVD). Each culvert has a vertical lift gate (each 5-
5
July 2024
C4 Basin Operation Plan
feet high by 10-feet wide) control gate at its upstream end. The gates can either be remotely operated from
the SFWMD Operation Control Center or controlled on -site. G-423 utilizes L.P. Gas driven generator at
G-420 as emergency back-up power. G-423 structure details are provided in Appendix 1.
4. OPERATING PLAN FOR C-4 BASIN
The structure description for the new structures (G-420, G-420S, G-421, G-422 and G-423) and existing
structures (S-25, S-25A, S-25B, S-26, G-93, G-119 and S-22) is incorporated into this report as part of
Appendix 1. For more details about the operation of the existing structures please refer to the corresponding
Water Control Plan or System Operating Manual.
In the event of a storm, the system will be operated as follows:
1) Discharges in C-4 shall continue to flow in the historic manner, that is, be routed towards the east to S-
25B.
2) Consistent with past practices, discharges are also routed south and east through the C-2 (Snapper
Creek) and C-3 (Coral Gables Canal) if conveyance capacity in these systems is available. These
systems will continue to be used so long as conveyance capacity exists as this is an open connection.
3) Both S-25B and S-26 forward pumps will be operated when the water level in Canal C-4, as measured
at T5W, rises above 3.6 feet NGVD.
4) Both S-25B and S-26 forward pumping will stop when the stage in the Miami River as measured at
MRMS1 monitoring station equals or exceeds elevation 4.75 feet NGVD, or once T5W has recovered
to below 3.5 feet NGVD and is receding.
5) Once the stage at T5W stage monitoring station reaches an elevation of 4.0 feet NGVD, pumping into
the EDB begins with either all 3 pumps at G-420 (total 669 cfs) or all pumps at G-422 (total 623 cfs)
turned on. If not already opened, G-423 will be opened fully at this time as well. When T5W stage
rises above 4.2 feet NGVD29, pumping into the EDB will increase to a maximum of 1,292 cfs (G-420
with 3 pumps = 669 cfs plus G-422 with 7 pumps = 623 cfs)
NOTE: The northern cell of the C-4 EDB is intended to be mined in the future. There is no
required change in operations or restrictions on operations once mining begins. The entire
EDB will continue to be fully available before, during, and after mining operations. The
G-423 culverts may at times be closed to facilitate mining operations when conditions
allow and potentially during some rain events if conditions allow. However, there is no
requirement to keep the G-423 culverts closed. The G-423 culverts can and will be opened
at will by the SFWMD.
6) When the stage at the T5W stage monitoring station reaches an elevation of 4.00 feet NGVD29, S-380
will be partially closed to limit discharges through only one culvert barrel. Therefore, 4 of the 5 culvert
gates will be closed completely. Should the stage at T5W increase to 4.5 feet NGVD29 all gates at S-
380 will be closed until the stage at T5W recedes to 4.0 feet NGVD.
7) Flood pumping into the EDB shall continue until at least one of the following conditions occurs:
6
July 2024
C4 Basin Operation Plan
a. Stages in the EDB have reached elevation 8.0 feet NGVD and stages at T5W begin to recede below
elevation 4.2 feet NGVD (also see note below) or;
b. The stage immediately upstream of the G-420 pump station is at or below elevation 2.6 feet
NGVD29 or;
c. Stages at T5W show a receding trend evidencing that the rest of the system can handle and convey
the inflows from the C-4 to tide or;
d. The stage in the EDB has reached a maximum elevation 10.00 feet NGVD29;
NOTE: When stages in the EDB are at 8.00 feet NGVD29 (half full), the District will assess
conditions and forecast and may temporarily reduce or terminate pumping. If the stage at
T5W rises to 4.4 feet NGVD29, then pumping into the EDB will resume until T5W stages
recede or the EDB is full (elevation 10.0 feet NGVD29).
8) Once a stage between 9.5 to 9.8 feet NGVD29 has been reached in the EDB, Miami -Dade County and
the Cities of Miami, Sweetwater, and West Miami will be notified to terminate pumping until advised
by the District that conditions in the primary system have improved and they may resume pumping.
The stage for notification within the 9.5 to 9.8 feet range will be based on potential for rainfall and rate
of rise of the EDB. Resumption of pumping may be limited to a partial capacity until conditions in the
C-4 Canal improve to allow incrementally greater or full capacity.
9) The District will consider commencing discharges out of the EDB through structure G-421 once the
storm event has passed and the stage at T5W recedes below elevation 4.0 feet NGVD. The discharges
will be regulated so as to not overtax the C-4 Canal. Gate operations will be performed while
monitoring stages at T5W and C4 Coral stage monitoring stations and maintaining a maximum stage
of 4.0 feet at TSW. If the stages in the C-4 Canal allow it (T5W stage is below elevation 4.0 feet
NGVD29 and trend is receding), the gate opening may be increased, until the system is discharged
completely. Once the EDB has been emptied, the S-380 structure may be fully opened to drain the area
west of S-380 down to a stage of 4.0 feet NGVD29.
7
Monitoring
Station ID
C4EDBSW
C4GW1
G4205
Easting
840185
837606
842440
842404
842424
842411
842228
July 2024
C4 Basin Operation Plan
Northing
521399
523091
523125
523251
522972
520238
523309
C4EDBSW
Figure 2: C-4 Emergency Detention Basin Monitoring Stations
APPENDIX 1 - WATER CONTROL STRUCTURES INFORMATION
9
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
STRUCTURE S-25B SPILLWAY
The S-25B is a two -bay, reinforced concrete gated spillway located in the City of Miami immediately east of the
Northwest 42'd Avenue (Le Jeune Road) crossing of the C-4 (Tamiami) Canal, east of Miami international airport.
The structure is currently maintained by Miami Field Station.
The structure consists of two (2) 11.9 feet high by 22.8 feet wide gates with sill elevations of -7.9 feet NGVD29.
The discharge from the structure is controlled by two (2) hydraulically driven cable operated vertical lift gates. The
gates can either be remotely operated from the SFWMD Operation Control Center or controlled on -site. To
maintain flood protection for the C-4 basin, a 600 cfs pump station was added to S-25B spillway as part of the
Miami Dade County Flood Mitigation Program (SFWMD, 2000a1).
PURPOSE
Structure S-25B controls flow from the C-4 canal to the Miami Canal downstream of S-26. The structure maintains
optimum water control stages upstream in the C-4 Canal; it was designed to pass 100% of the Standard Project
Flood (SPF) for the eastern portion of the C-4 basin without exceeding upstream flood design stage and restricts
downstream flood stages and discharge velocities to non -damaging levels; and it prevents saltwater intrusion
from Miami Canal during periods of high tides.
OPERATIONS
This structure will operate to maintain an optimum headwater elevation of 2.8 feet NGVD29 but includes seasonal
variability from a low of 0.0 feet NGVD29 to a maximum of 3.0 feet NGVD29. The automatic controls on gates will
function as follows:
Normal Range
Normal operational range is from 2.0 feet NGVD29 to 3.0 feet NGVD29. During very dry conditions the
bottom of normal range may be raised by 0.5 feet (2.5 feet NGVD29) to prevent saltwater intrusion.
Low Range
Low operational range is from 1.0 feet NGVD29 to 2.0 feet NGVD29. During very wet conditions in the C-
4 Basin or when C-4 detention basin EDB is used for flood control, an operational range of 0.0 to 1.0 feet
NGVD29 may be used.
For manatee protection the minimum gate opening is 2.5 feet. The SFWMD has installed manatee sensor devices
consisting of a series of pressure sensitive plates on the bottom of the vertical lift gates which transmit a signal
used to reverse gate direction when resistance is encountered. When the sensors are enacted, the gate will pause
for 3 seconds and return to 2.5 feet. When it reaches 2.5 feet, it will fully close unless something is still under the
gate. The controls for the manatee sensor devices override those for the alternate gate operation.
SFWMD, 2000a. Flood Mitigation Projects, Miami -Dade County, Florida. SFWMD, Emergency Operations Center, Recovery
Task Force Recommendations, October 24, 2000.
Al-1
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
During severe storms and hurricanes for which the probability of inundation of the backup generator is high, S-
25B is locked open and the generator which normally auto -start during power failures are deactivated to facilitate
rapid recommissioning following the storm.
Table 1. Discharge Characteristics of Structure S-25B Spillway
DISCHARGE CHARACTERISTICS
Design Discharge
2,000 cfs (100% SPF for eastern C-4 basin)
SPF Discharge
2,000 cfs
Design Headwater Elevation
4.4 feet NGVD291
SPF Headwater Elevation
4.4 feet NGVD291
Design Tailwater Elevation
4.1 feet NGVD29
SPF Tailwater Elevation
4.1 feet NGVD29
Optimum Headwater Elevation
2.8 feet NGVD29
Optimum Tailwater Elevation
Tidal
Minimum Headwater Elevation
N/A
Minimum Tailwater Elevation
1.5 feet NGVD29 (MWVM, V.5, 1995)
Type of Discharge
Uncontrolled submerged
Generator Finished Floor Elevation
10.7 feet NGVD29
Storm Surge - MOM Elevation2
Hurricane Category 1
5.15 feet NGVD29
Hurricane Category 2
5.65 feet NGVD29
Hurricane Category 3
6.45 feet NGVD29
Hurricane Category 4
7.65 feet NGVD29
Hurricane Category 5
9.85 feet NGVD29
'Allowing for 0.3-feet head loss due to debris and vegetation, the design and SPF HW would be 4.7 feet NGVD29 (MWCM, A-
S25B-2, V.5, 1995).
2 MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with
high tide as initial condition).
Table 2. Hydraulic Description of Structure S-25B Spillway
DESCRIPTION OF STRUCTURE
Type
Fixed crest reinforced concrete gated spillway
Weir crest:
Trapezoidal
Net crest length:
44.0 feet
Crest elevation:
-7.9 feet NGVD29
Service bridge elevation:
8.7 feet NGVD29
Water level which will bypass structure:
5.7 feet NGVD29
Gates
Number:
2
Al-2
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
DESCRIPTION OF STRUCTURE
Size:
11.9 feet high by 22.8 feet wide
Type:
Vertical lift
Gate Control:
Remote and automatic on -site control
Bottom elevation of gate full open:
5.7 feet NGVD29
Top elevation of gate full closed:
4.0 feet NGVD29
Apron
Apron elevation:
-9.9 feet NGVD29
Apron length:
20.0 feet
End sill elevation:
-8.9 feet NGVD29
Riprap Length (downstream):
20 feet
Canal Description (upstream and downstream)
Bottom width:
Both 75 feet
Bottom elevation:
Both -12.0 feet NGVD29
Side Slope (V): (H):
Both 1:2
Lift Mechanism
Normal Power Source:
Commercial electricity
Emergency Power Source:
L. P. gas driven generator
Type:
Hydraulic cylinder actuated by electric motor
driven pump, with emergency hand pump;
connected to gate by steel cables
Hydraulic and Hydrologic Measurements
Water Level:
Telemetered headwater (HW) and tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Date of Transfer:
Unknown
Dewatering Facilities:
Storage:
Needles at Miami Field Station
Beams at West Palm Beach Field Station
Type:
Needle beams and vertical aluminum needles
Size and Nos (per bay):
Upstream and downstream
Number — 2 beam; needles, 5 @ 4', 1 @ 3', 1 @ 2'
wide
Size — beam needles 20' long
Manatee Protection System
Yes
Access
Access to the structure is gained by a short access
road (about 600 feet) from N.W. 21st Street just
east of Le Jeune Road in the City of Miami.
Al-3
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
STRUCTURE S-25B FORWARD PUMP STATION
The S-25B Forward Pump is a reinforced concrete, electric pump station, with discharge controlled by three (3)
200 cfs pumps. These pumps were added to the gravity structure S-25B in 2002 to maintain discharges from the
land side to the seaside of the structure when gravity capacity is limited, or the gates need to be closed due to the
threat of saltwater intrusion. The pumped water flows into the 120 feet box culvert that runs under and along the
edge of a golf course south of the S-25B spillway and discharges downstream (east) of S-25B into the C-4 canal.
The culvert is 10 feet high by 8 feet wide and consists of segmental sections with bell and spigot type connections.
The pumps can either be remotely operated from the SFWMD Operation Control Center or controlled on -site. This
structure is operated in coordination with the adjacent S-25B spillway.
PURPOSE
Operation of the S-25B Forward Pump Station allows additional discharge capacity during high tide or storm surge
events when downstream water levels are elevated.
OPERATIONS
Operation of the S-25B Forward Pump Station is an integral part of C-4 Basin Operating Plan (SFWMD, 2024) and
at least one unit will be operated to control upstream stages when all of the conditions listed below occur
concurrently:
1. The T5W gage stage exceeds 3.6 feet NGVD29. The T5W gage is located on the C-4 canal, just upstream
from its crossing under the Florida Turnpike.
2. The Miami River Stage Monitoring Station 1 (MRMS1) is less than 4.75 feet NGVD29, or T5W has not
recovered to below 3.5 feet NGVD29. The MRMS1 gage is located on the Miami Canal (C-6) just
downstream of the NW 27th Ave Bridge.
3. The headwater elevation at S-25B is above 1.0 feet NGVD29.
When S-25B spillway is discharging more than 600 cfs the pumps may be secured, or they may be run 24/7 if
the conditions warrant it. 24/7 operations are subject to the headwater low limit of 1.0 feet NGVD29.
Al-4
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
Table 3. Discharge Characteristics of S-25B Forward Pump
DISCHARGE CHARACTERISTICS
Design Discharge Capacity Total
600 cfs (3x200 cfs)
Design Discharge Capacity Per Pump
200 cfs
Design Headwater Elevation
N/A
Minimum Low Water (Headwater) Elevation
0.9 feet NGVD29
Generator Finished Floor Elevation
10.7 feet NGVD29
Storm Surge - MOM Elevation'
Hurricane Category 1
5.15 feet NGVD29
Hurricane Category 2
5.65 feet NGVD29
Hurricane Category 3
6.45 feet NGVD29
Hurricane Category 4
7.65 feet NGVD29
Hurricane Category 5
9.85 feet NGVD29
1MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high
tide as initial condition).
Table 4. Hydraulic Description of S-25B Forward Pump
DESCRIPTION OF STRUCTURE
Type
Submersible Pumps with a 54" vertical lift Impeller
Pump
Number:
3
Manufacturer:
MWI
Model:
SEA354
Impeller Size:
4.5 feet
Impeller Speed:
305 rpm
Engine Speed:
1,780 RPM
Engine horsepower:
400 HP
Intake and Discharge Pipe Diameter:
N/A (Submersible)
Discharge Pipe Length:
N/A (Submersible)
Service Bridge Elevation:
8.7 feet NGVD29
Inundation Level (Operating Floor):
N/A (Submersible)
Invert elevation
Intake Bell:
-7.33 feet NGVD29
Discharge Weir Crest:
6.0 feet NGVD29
Bottom Elevation of Inlet Bay:
-10.0 feet NGVD29
Power
Normal:
Commercial electricity during off-peak hours;
Onan diesel generator model DFEC-5002522, 450
KW during peak hours and emergencies.
Emergency:
Onan diesel generator model DFEC 450 KW
Al-5
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
DESCRIPTION OF STRUCTURE
Gate
Type:
N/A
Gate Size:
N/A
Hydraulic and Hydrology Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Pump Status:
Telemetry recorder
Rain Gauge:
No
Canal Description (upstream; downstream)
Bottom width:
Both 75 feet
Bottom elevation:
Both -12.0 feet NGVD29
Side Slope (V): (H):
Both 1:2
Manatee Protection System
Yes
Date of Transfer/Operation:
2004
ACCESS
Access to the structure is gained by a short access road
(about 600 feet) from N.W. 21st Street just east of Le
Jeune Road in the City of Miami.
Al-6
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
S31
• fi
f< 7ELO CAN4
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Dikc.ss�4
6'44��rcAMAc
NORTH LINE CANAL
NORTH LINE CANAL
2
S335 G423 `1i
Ir�li G420S Y
4U G420 it
G119 5380. G421 `; •
4= G422
C-4 Detention Basin
V I1 -" -
Area shown -�
on mein map • r1,-
,L
LOCATION MAP
S1F21
ezl
•
•
Legend
40 Stage Monitor Site
Q CULVERT
B FLUME
▪ LOCK
d PUMP
M SPILLWAY
WEIR
Primary
Secondary
Municipal Pumps
Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+_Fondrard Pumps
orwart t
Figure 1: Structure S-25B Location
Al-7
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
Figure 2: Structure S-25B- Upstream View
Al-8
•
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
Figure 3: Structure S-25B Forward Pump — Upstream and Aerial View
Al-9
Publish Date: 7/26/2024
S-25B — STRUCTURE [NAVD88 = NGVD29 -1.55 FEET]
S-25B RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Water Manager review
Water
Managers
7/24/2024
Final approval
Structure Information
Sheet Update
Z. Li
7/16/2024
Update new structural information sheet;
operation; and format.
Structure Information
Sheet Update
S. Hajimirzaie
05/02/2019
Update new structural information sheet;
operation; and format
Editorial
C. Qi
09/16/2014
Added NAVD 88 conversion factor; verified
and modified section on Manatee sensors.
Editorial
Unknown
02/28/2012
Added record of change table. Updated to be
consistent with the C4 Canal Operating Plan.
Minimum head differential before gates close
was changed from 0.3 to 0.1 feet.
Format
T. Strowd
07/26/2002
No changes
S-25BP RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Structure Information
Sheet Update
S. Hajimirzaie
05/02/2019
Update new structural information sheet;
operation; and format
Editorial and Format
J. Brecher
7/21/2015
Update format of document.
Format
T. Strowd
05/2/2002
No changes
Al-10
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
STRUCTURE S-26 SPILLWAY
S-26 is a two -bay, reinforced concrete gated spillway located in the City of Miami at the NW 36th Street crossing
of the Miami (C-6) Canal, between NW North River Drive and NW South River Drive, northeast of the Miami
International Airport. The structure is currently maintained by the Miami Field Station.
The structure consists of two (2) 14.1 feet high by 26.0 feet wide gates with sill elevations of -10.1 feet NGVD29.
The discharge from the structure is controlled by two (2) hydraulically driven cable operated vertical lift gates. The
gates can either be remotely operated from the SFWMD Operation Control Center or controlled on -site. To
maintain flood protection for the C-6 basin, a 600 cfs pump station was added to S-26 spillway as part of the Miami
Dade County Flood Mitigation Program (SFWMD, 2000a1).
PURPOSE
The S-26 is the outlet to tide for the C-6 basin. The structure maintains optimum water control stages upstream
in C-6 Canal; it was designed to pass 100% of the Standard Project Flood (SPF) without exceeding upstream flood
design stage and restricts downstream flood stages and discharge velocities to non -damaging levels; and it
prevents saltwater intrusion during periods of high tides.
OPERATIONS
This structure will operate to maintain an optimum headwater stage of 2.5 feet NGVD29 but includes seasonal
variability from a low of 1.2 feet NGVD29 to a maximum of 2.8 feet NGVD29. The automatic controls on gates will
function as follows:
Normal Range
Normal operational range is from 2.3 feet NGVD29 to 2.8 feet NGVD29. During very dry conditions normal
operational range may be raised by 0.2 feet to prevent saltwater intrusion.
Low Range
Low operational range is from 1.2 feet NGVD29 to 1.7 feet NGVD29. During very wet conditions in the C-
6 basin, or when the C-4 EDB is used for flood control, an operational range of 0.0 to 1.0 feet NGVD29
may be used.
To meet structural and stability requirements, the maximum allowable head differential on S-26 should not
exceed 5.0 feet.
For manatee protection the minimum gate opening is 2.5 feet. The SFWMD has installed manatee sensor devices
consisting of a series of pressure sensitive plates on the bottom of the vertical lift gates which transmit a signal
used to reverse gate direction when resistance is encountered. When the sensors are enacted, the gate will pause
SFWMD, 2000a. Flood Mitigation Projects, Miami -Dade County, Florida. SFWMD, Emergency Operations Center, Recovery
Task Force Recommendations, October 24, 2000.
Al-11
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
for 3 seconds and return to 2.5 feet. When it reaches 2.5 feet, it will fully close unless something is still under the
gate. The controls for the manatee sensor devices override those for the alternate gate operation.
During severe storms and hurricanes for which the probability of inundation of the backup generator is high, S-26
is locked open and the generator which normally auto -start during power failures are deactivated to facilitate
rapid recommissioning following the storm.
Table 1. Discharge Characteristics of Structure S-26 Spillway
DISCHARGE CHARACTERISTICS
Design Discharge
3,470 cfs (100% SPF)
SPF Discharge
3,470 cfs
Optimum Headwater Elevation
2.5 feet NGVD29
Design Headwater Elevation
4.4 feet NGVD29
Design Tailwater Elevation
3.9 feet NGVD29
SPF Headwater Elevation
4.4 feet NGVD29
SPF Tailwater Elevation
3.9 feet NGVD29
Optimum Tailwater Elevation
Tidal
Type of Discharge
Uncontrolled submerged
Generator Finished Floor Elevation
10.3 feet NGVD29
Storm Surge - MOM Elevation'
Hurricane Category 1
5.84 feet NGVD29
Hurricane Category 2
6.34 feet NGVD29
Hurricane Category 3
7.04 feet NGVD29
Hurricane Category 4
9.04 feet NGVD29
Hurricane Category 5
10.84 feet NGVD29
'MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high
tide as initial condition).
Table 2. Hydraulic Description of Structure S-26 Spillway
DESCRIPTION OF STRUCTURE
Type
Fixed crest reinforced concrete gated spillway
Weir crest:
Trapezoidal
Net crest length:
52.0 feet
Crest elevation:
-10.1 feet NGVD29
Service bridge elevation:
8.4 feet NGVD29
Water level which will bypass structure:
5.5 feet NGVD29
Gates
Number:
2
Size:
14.1 feet high by 26.81 feet wide
Type:
Vertical lift
Gate Control:
Remote and automatic on -site control
Bottom elevation of gate full open:
5.4 feet NGVD29
A1-12
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
DESCRIPTION OF STRUCTURE
Top elevation of gate full closed:
4.0 feet NGVD29
Apron
Apron elevation:
-11.0 feet NGVD29
Apron length:
7.9 feet
End sill elevation:
None
Riprap length (downstream):
None (down to bedrock)
Canal Description (upstream and downstream)
Bottom width:
Both 60 feet
Bottom elevation:
Both -10.0 feet NGVD29
Side Slope (V): (H):
Both 1:1
Lift Mechanism
Normal Power Source:
Commercial electricity
Emergency Power Source:
L. P. gas driven generator
Type:
Hydraulic cylinder actuated by electric motor driven
pump, with emergency hand pump; connected to gate by
steel cables
Hydraulic and Hydrologic Measurements
Water Level:
Telemetered headwater (HW) and tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Date of Transfer:
Unknown
Dewatering Facilities:
Storage:
Needles at Miami Field Station
Beams at West Palm Beach Field Station
Type:
Needle beams and vertical aluminum needles
Size and Nos (per bay):
Beam 27WF84 with ends cut down to 18", length 27' - 11"
needles 20 long
Manatee Protection System
Yes
Access
The structure is located about 150 feet northeast of NW
South River Drive just downstream from NW 36th Street,
City of Miami.
A1-13
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
STRUCTURE S-26 FORWARD PUMP STATION
5-26 Forward Pump is a reinforced concrete, electric pump station, with discharge controlled by three (3) 200 cfs
pumps. These pumps were added to the gravity structure 5-26 to maintain discharges from the land side to the
seaside of the structure when gravity capacity is limited, or the gates need to be closed due to the threat of
saltwater intrusion. The pumps can either be remotely operated from the SFWMD Operation Control Center or
controlled on -site. This structure is operated in coordination with the adjacent S-26 spillway.
PURPOSE
Operation of the S-26 Forward Pump Station allows additional discharge capacity during high tide or storm surge
events when downstream water levels are elevated. Also, when the S-25B (south of 5-26 on C-4 canal) forward
pump station is operating, and the S-26 spillway capacity is reduced, the S-26 forward pump station will be
operated to maintain upstream flood control protection.
OPERATIONS
The S-26 forward pump station will be operated to maintain an upstream flood control range of 1.0 to 1.4 feet
NGVD29. This pump station is turned on whenever all the following conditions occur concurrently:
1) The S-25B forward pumps are discharging, and;
2) The HW stage measured at the pump station is above elevation 1.4 feet NGVD29.
3) The water level in Canal C-4, as measured at T5W, rises above 3.6 feet NGVD29.
The pump station will be turned off whenever any of the following conditions occur:
1) The S-25B forward pump station is turned off, or;
2) the stage measured at the pump station recedes below elevation 1.0 feet NGVD29, or;
3) the S-26 spillway has sufficient available capacity;
4) Miami River Stage Monitoring Station 1 (MRMS1), 1.7 Miles downstream of 5-26, is greater than 4.75
feet NGVD29.
5) T5W has recovered to below 3.5 feet NGVD29 and is receding.
When S-26 spillway is discharging more than 600 cfs the pumps may be secured, or they may be run 24/7 if the
conditions warrant. 24/7 operations are subject to the headwater low limit of 1.0 feet NGVD29.
This pump station may also be used during very wet conditions in the C-6 basin or when moving water to tide
from Water Conservation Area 3A (WCA-3A).
A1-14
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
Table 3. Discharge Characteristics of S-26 Forward Pump
DISCHARGE CHARACTERISTICS
Design Discharge Capacity Total
600 cfs (3x200 cfs)
Design Discharge Capacity Per Pump
200 cfs
Design Headwater Elevation
N/A
Minimum Low Water (Headwater) Elevation
0.9 feet NGVD29 (0.0 design value)
Generator Finished Floor Elevation
8.34 feet NGVD29
Storm Surge - MOM Elevation'
Hurricane Category 1
5.84 feet NGVD29
Hurricane Category 2
6.34 feet NGVD29
Hurricane Category 3
7.04 feet NGVD29
Hurricane Category 4
9.04 feet NGVD29
Hurricane Category 5
10.84 feet NGVD29
'MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high
tide as initial condition).
A1-15
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
'111
Table 4. Hydraulic Description of S-26 Forward pump
DESCRIPTION OF STRUCTURE
Type
Submersible Pumps with a 54" vertical lift Impeller
Pump
Number:
3
Manufacturer:
MWI
Model:
SEA354
Impeller Size:
4.5 feet
Impeller Speed:
305 RPM
Engine Speed:
1,780 RPM
Engine horsepower:
400 HP
Intake and Discharge Pipe Diameter:
N/A (Submersible)
Discharge Pipe Length:
N/A (Submersible)
Service Bridge Elevation:
8.5 feet NGVD29
Inundation Level (Operating Floor):
N/A (Submersible)
Invert elevation
Intake Bell:
-7.33 feet NGVD29
Discharge Weir Crest:
6.0 feet NGVD29
Bottom Elevation of Inlet Bay:
-10.0 feet NGVD29
Power
Normal:
Commercial electricity during off-peak hours;
Onan diesel generator model DFEC-5002522, 450
KW during peak hours and emergencies.
Emergency:
Onan diesel generator model DFEC 450 KW
Gate
Type:
N/A
Gate Size:
N/A
Hydraulic and Hydrology Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Pump Status:
Telemetry recorder
Rain Gauge:
Yes (S26_R)
Canal Description (upstream; downstream)
Bottom width:
Both 60 feet
Bottom elevation:
Both -10.0 feet NGVD29
Side Slope (V): (H):
Both 1:1
Manatee Protection System
Yes
Date of Transfer/Operation:
2004
Access
The structure is located about 150 feet northeast of
NW South River Drive just downstream from NW 36th
Street, City of Miami.
A1-16
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
S335
/"G119
1
• F
{47ELD CANAL
III
C-2 EXTENSION CANAL
Dii'ESSE74`�
CANAL
NORTH LINE CANAL
NORTH LINE CANAL
z
G423 3
G420SX
G420 W
S380 421 c0i
C.4 G422
•
C-4 Detention Basin
soCAI
Area shown +
an main map - =
ti
111
LOCATION MAP
W
C4.CORAL
C7 s72o
C �
a
�.J
•
G93
522(
Legend
• Stage Monitor Site
Q CULVERT
FLUME
LOCK
PUMP
U SPILLWAY
WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
® Sweetwater (SWE)
City of Miami (CITMIA)
=% West Miami (WMI)
S26+ Foulard Pumps
.fir
Figure 1: Structure S-26 Location
A1-17
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
Figure 2: Structure S-26 Aerial View
A1-18
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
Figure 3: Downstream of the S-26 Structure Looking at the Three Forward Pumps Located Adjacent to
the S-26 Spillway Being Tested.
A1-19
Publish Date: 7/26/2024
S-26 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
S-26 RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Field Station Revisions
07/2002
No changes
Operational Revisions
01/12/2003
Review completed. Under "Water Level"
change:
• On . itc . . itc digital (� �SGS)
alog
a -Fret remote digital upstream and
downstream recorders.
Format and Fact Check
2/27/2015
QA/QC and updating the format of the
structure information sheet
Structure Information
Sheet Update
S. Hajimirzaie
05/14/2019
Update new structural information sheet
Structure Information
Sheet Update
Z. Li
7/16/2024
Update new structural information sheet;
operation; and format.
Water Manager review
Water
Managers
7/24/2024
Final approval
S-26P RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Field Station Revisions
07/2002
No changes
Structure Information
Sheet Update
G. Hwa, R.
Mierau, and
C. Neidrauer
05/05/2005
S-26 Pump
Format
J. Brecher
7/22/15
Update format of document
Structure Information
Sheet Update
S. Hajimirzaie
05/14/2019
Update new structural information sheet
A1-20
S-22 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
DESCRIPTION
S-22 is a two -bay, reinforced concrete gated spillway located in C-2 (Snapper Creek) Canal, about 7,000 feet from
the mouth of Biscayne Bay and about ten miles southwest of downtown Miami. The C-2 Canal has as an open
channel connection with C-4 Canal, west of intersection of Turnpike and Miami SW 8th Street. The structure is
currently maintained by the Miami Field Station.
The structure consists of two (2) 15.0 feet high by 17.7 feet wide gates with sill elevations of -11.0 feet NGVD29.
The discharge from the structure is controlled by an electric driven cable drum operated vertical lift gate. The
gates can either be remotely operated from the SFWMD Operation Control Center or controlled on -site. Operation
of the gate is automatically controlled so that the gate opens or closes in accordance with the operational criteria.
PURPOSE
The purpose of S-22 is to permit release of flood runoff from the tributary basin, prevent over -drainage and
saltwater intrusion during periods of high tides and from storm surges. The structure maintains optimum water
control stages upstream in C-2 Canal; it was designed to pass 100% of the Standard Project Flood (SPF) without
exceeding upstream flood design stage. The design tailwater of S-22 in 1963 had a 5-yr return frequency; it now
has a 2-yr return frequency (C-4 Watershed LOS, 2016).
OPERATIONS
This structure will operate to maintain an optimum headwater elevation of 2.9 feet NGVD29 but includes seasonal
variability from a low of 0.0 feet NGVD29 to a maximum of 3.5 feet NGVD29. The automatic controls on gates will
function as follows:
Normal Range
Normal operational range is from 2.5 feet NGVD29 to 3.5 feet NGVD29. During very dry conditions the
bottom of normal range may be raised by 0.5 feet (3.0 feet NGVD29) to prevent saltwater intrusion.
Low Range
Low operational range is from 1.5 feet NGVD29 to 2.5 feet NGVD29. During very wet conditions in the
C-4, C-3 and C-2 basins, an operational range of 0.0 to 1.0 feet NGVD29 may be used.
To prevent saltwater intrusion during periods of high tides, the automatic controls on S-22 closes the gates,
regardless of the upstream water level, whenever the differential between the head and tailwater pool elevations
fall below 0.1 feet.
For manatee protection, the minimum gate opening is 2.5 feet. The SFWMD has installed manatee sensor devices
consisting of a series of pressure sensitive plates on the bottom of the vertical lift gates which transmit a signal
used to reverse gate direction when resistance is encountered. When the sensors are enacted, the gate will pause
for 3 seconds and return to 2.5 feet. When it reaches 2.5 feet, it will fully close unless something is still under the
gate. The controls for the manatee sensor devices override those for the alternate gate operation.
A1-21
Publish Date: 1/22/2020
S-22 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
During severe storms and hurricanes for which the probability of inundation of the backup generator is high, S-22
is locked open and the generator which normally auto -start during power failures are deactivated to facilitate
rapid recommissioning following the storm.
Table 1. Discharge Characteristics of Structure S-22
DISCHARGE CHARACTERISTICS
Design Discharge
1,905 cfsl (100% SPF)
SPF Discharge
1,905 cfs
Design Headwater Elevation
3.2 feet NGVD292
Design Tailwater Elevation
2.7 feet NGVD29
Optimum Headwater Elevation
2.9 feet NGVD29
Optimum Tailwater Elevation
Tidal
Minimum Headwater Elevation
N/A
Minimum Tailwater Elevation
N/A
Type of Discharge
Uncontrolled submerged
Generator Finished Floor Elevation
9.4 feet NGVD29
Storm Surge - MOM Elevation3
Hurricane Category 1
N/A feet NGVD29
Hurricane Category 2
9.44 feet NGVD29
Hurricane Category 3
11.54 feet NGVD29
Hurricane Category 4
14.24 feet NGVD29
Hurricane Category 5
17.04 feet NGVD29
' Calculated based on head differential of 0.2 feet (0.3 feet losses due to debris)- DDM Part V Sup 14.
MVCM, V.5, 1995
MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water
with high tide as initial condition).
A1-22
Publish Date: 1/22/2020
S-22 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
Table 2. Hydraulic Description of Structure S-22
DESCRIPTION OF STRUCTURE
Type
Fixed crest, reinforced concrete gated spillway
Weir crest:
Trapezoidal
Net crest length:
34.0 feet
Crest elevation:
-11.0 feet NGVD29
Service bridge elevation:
8.5 feet NGVD29
Water level which will bypass structure:
7.5 feet NGVD29
Strive 2001 taken at SE corner of structure: 8.48 feet
NGVD29)
Gates
Number:
2
Size:
15.0 feet high by 17.7 feet wide
Type:
Vertical lift
Gate control:
Remote and automatic on -site control
Bottom elevation of gate full open
4.0 feet NGVD29
Top elevation of gate full closed
4.0 feet NGVD29
Apron
Apron elevation:
-12.0 feet NGVD29
Apron length:
20.5 feet
End sill elevation:
-11.5 feet NGVD29
Riprap Length (downstream):
20 feet
Canal Description (upstream and downstream)
Bottom width:
Both 24 feet
Bottom elevation:
Both -15 feet NGVD29
Side Slope (H): (V):
Both 1H:1V
Lift Mechanism
Normal power source:
Commercial electricity
Emergency power source:
L.P. gas driven generator
Type:
Direct drive electric motor gear, connected to gear
box and stems
Hydraulic and Hydrologic Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Rain Gauge:
N/A
Date of Transfer
June 25, 1956
Dewatering Facilities
Storage:
Needles at Miami Field Station; beams at West Palm
Beach Field Station
A1-23
Publish Date: 1/22/2020
S-22 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
DESCRIPTION OF STRUCTURE
Type:
Needle beams and vertical aluminum needles
Size and No (per bay):
Upstream and downstream
1 beam; needles, 5 @ 4', 1 @ 3' wide, 1 @ 2' wide
beam 14WF78, length 18' -10"
needles 20' long
Manatee Protection System
Yes
Access
The structure is located adjacent to Red Road (57th
Avenue), approximately 0.1 mile north of Killian
Drive (SW 111 St.), across the street from Parrot
Jungle.
S149S122
S148'
Figure 1: Structure S-22 Location. C-2 Canal open junction with C-4 Canal is shown as well.
A1-24
Publish Date: 1/22/2020
S-22 — STRUCTURE [NAVD88 = NGVD29 -1.54 FEET]
We Jener Sun
May 2001
Figure 2: Structure S-22 - Upstream View
A1-25
Publish Date: 1/22/2020
Date Revised
07/2002
01/16/2003
7/15/2015
RECORD OF CHANGES
RECORDED AS OF JANUARY 1, 2002
S-22
Field Station Revisions:
• No Changes.
Operational Revisions:
Review completed. Under "Water Level" change:
• On site analog, on site digital (USGS), and remote digital
upstream and downstream recorders.
• Gate Position Recorder: On site analog recorder on 1/1 gate and
digital remote recorder on both gates.
Format and Fact Check
• Design head water was changed from 3.5 to 3.2 feet NGVD 29
(Source: Water Control Plan)
4/8/2019 Structure Information Sheet Update:
• Update new structural information sheet.
5/02/2019 Water Managers Review
• Standardization of format/tables.
• Operational Revisions: Intermediate ranges were removed.
Gates become stationary were removed from both low/high
ranges: When the headwater elevation rises or falls to 2.9 feet,
the gates will become stationary.
• Low operational range values were added.
• For the probability of the inundation of the backup generator
during severe storms and hurricanes, this standard language
was added: During severe storms and hurricanes for which the
probability of inundation of the backup generator is high, S-22
is locked open and the generator which normally auto -start
during power failures are deactivated to facilitate rapid
recommissioning following the storm.
01/13/2020 Water Managers Approval:
• Final review and approval.
A1-26
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
DESCRIPTION
Structure G-93 is a two -bay, reinforced concrete gated spillway on the C-3 (Coral Gables) Canal, west of Southwest
57th Ave (Red Road or SR 959) in the City of Coral Gables. The C-3 Canal has an open connection to C-4 Canal just
east of the Palmetto Expressway and continues about 4.1 miles downstream of G-93 through highly urbanized
south Miami areas before discharging to Biscayne Bay at Sunrise Harbor. The original structure, G-97, was replaced
in January 1990 by G-93. The structure is currently maintained by Miami Field Station.
The structure consists of two (2) 5.0 feet high by 10.0 feet wide gates with sill elevations of -1.8 feet NGVD29. The
discharge from the structure is controlled by two (2) stem operated vertical lift roller gates. The gates can either
be remotely operated from the SFWMD Operation Control Center or controlled on -site.
PURPOSE
The structure maintains optimum upstream water control stages; it was designed to pass 40% of the Standard
Project Flood (SPF) plus a small discharge from the C-4 basin without exceeding upstream flood design stage and
restricts downstream flood stages and discharge velocities to non -damaging levels; and it prevents saltwater
intrusion during periods of high tides.
OPERATIONS
This structure, together with S-25B on the C-4 (Tamiami) Canal and S-22 on C-2 Canal, is remotely operated to
maintain the optimum headwater elevation of 2.8 feet NGVD29 insofar as possible.
Normal Range
Under the Normal Operating Range, the gate opens when the upstream water level reaches 3.0 feet
NGVD29 and closes when upstream water level falls to 2.1 feet NGVD29. To prevent excessive gate cycling,
the normal range can be set to 1.0 to 3.3 feet NGVD29.
Low Range
A low range is used under storm conditions or when Emergency Flood Control releases are required in C-
4. Under the Low Operating Range, the gate opens when the upstream water level reaches 2.3 feet
NGVD29 and closes when upstream water level falls to 1.0 feet NGVD29. During very wet conditions in
the C-4, C-3 and C-2 basins, an operational range of 0.0 to 1.0 feet NGVD29 may be used.
For manatee protection the minimum gate opening is 2.5 feet. The SFWMD has installed manatee sensor devices
consisting of a series of pressure sensitive plates on the bottom of the vertical lift gates which transmit a signal
used to reverse gate direction when resistance is encountered. When the sensors are enacted, the gate will pause
for 3 seconds and return to 2.5 feet. When it reaches 2.5 feet, it will fully close unless something is still under the
gate. The controls for the manatee sensor devices override those for the alternate gate operation.
During severe storms and hurricanes for which the probability of inundation of the backup generator is high, G-
93 is locked open and the generator which normally auto -start during power failures are deactivated to facilitate
rapid recommissioning following the storm.
A1-27
Publish Date: 1/27/2020
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Table 1. Discharge Characteristics of Structure G-93
DISCHARGE CHARACTERISTICS
Design Discharge
640 cfs (40% SPF)
SPF Discharge
1,600 cfs
Optimum Headwater Elevation
2.8 feet NGVD29
Design Headwater Elevation
4.5 feet NGVD29
Design Tailwater Elevation
3.0 feet NGVD29
SPF Headwater Elevation
N/A
SPF Tailwater Elevation
N/A
Optimum Tailwater Elevation
Tidal
Design Discharge Flow Type
Controlled submerged
Generator Finished Floor Elevation
9.5 feet NGVD29
Storm Surge - MOM Elevation'
Hurricane Category 1
N/A
Hurricane Category 2
7.06 feet NGVD29
Hurricane Category 3
9.06 feet NGVD29
Hurricane Category 4
9.56 feet NGVD29
Hurricane Category 5
10.96 feet NGVD29
'MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high
tide as initial condition).
Table 2. Hydraulic Description of Structure G-93
DESCRIPTION OF STRUCTURE
Type
Fixed crest reinforced concrete gated spillway
Weir crest:
Trapezoidal
Net crest length:
20.0 feet
Crest elevation:
-1.8 feet NGVD29
Service bridge elevation:
7.6 feet NGVD29
Water level which will bypass structure:
6.0 feet NGVD29
Maximum permissible head:
Unknown
Gates
Number:
2
Size:
5.0 feet high by 10.0 feet wide
Type:
Single stem vertical lift
Gate Control:
Remote and automatic on -site control
Bottom elevation of gate full open:
6.7 feet NGVD29
Top elevation of gate full closed:
3.2 feet NGVD29
Apron
Apron elevation:
-5.5 feet NGVD29
Apron length:
19.5 feet
End sill elevation:
No End Sill
Riprap Length (downstream):
None
A1-28
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
DESCRIPTION OF STRUCTURE
Canal Description (upstream and downstream)
Bottom width:
Both 25 feet
Bottom elevation:
Both -5.5 feet NGVD29
Side Slope (V): (H):
Both 1:2.5
Lift Mechanism
Normal Power Source:
Commercial electricity
Emergency Power Source:
L. P. gas driven generator
Type:
Hydraulic cylinder actuated by electric motor driven
pump, with emergency hand pump; connected to gate by
steel cables
Hydraulic and Hydrologic Measurements
Water Level:
Telemetered headwater (HW) and tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Date of Transfer:
Unknown
Dewatering Facilities:
Storage:
Needles at Miami Field Station
Beams at West Palm Beach Field Station
Type:
Galvanized beams
Size and Nos (per bay):
Two W8 X 24 beams, each 10' 10" long
Manatee Protection System
Yes (installed in 2002)
Access
The structure is in the Coral Gables Wayside Park, 5710
SW 35th St, Coral Gables.
A1-29
Publish Date: 1/27/2020
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
S31 ri
S335
7G119 $380
Area shown -;
L.
on main map
,. •• (,4IELD CANAL
G72
DrQss74
sC NA
A L
NORTH LINE CANAL
NORTH LINE CANAL
2
G423 U
G4205
G420
'b G421
G422
C-4 Detention Basin
Legend
I Stage Monitor Site
▪ CULVERT
B FLUME
▪ LOCK
PUMP
IA SPILLWAY
WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+ Fot4ard Pumps
L.
Figure 1: Structure G-93 Location
A1-30
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Figure 2: Structure G-93 on the C-3 (Coral Gables) Canal, the Coral Gables Wayside Park. G-93 controls are located
in the Coral Gables Wayside Park's historical towers (U.S. National Register of Historic Places 1989)
A1-31
G-93 — STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Type
Date
Reason for Change
Field Station
Revisions
07/2002
No changes
Operational
Revisions
12/26/2002
Review Completed - no changes as of 11/18/97
Survey
01/22/2008
NGVD88 conversion factor was added.
Verification of
Component
upgrade
4/30/2012
RACU Replacement Project: Motorola ACE3640 RTU replaced the RACU and a
Solar Power was added. All other site Parameters remained unchanged. (Verified:
Site Registration Form)
Fact check
02/03/2015
Added confirmation of the information
Fact check
02/03/2015
Removed reference to G-93 being manually operated including the statement
"An automatic device has not been installed due to the possibility of injury to
manatees." As MPS installed in 2002. And "During storm events, the gates will
be opened." Since that was due to the need for a crane to be mobilized and now
the structure is automated.
Structure
Information
Sheet Update
08/07/2019
Water Managers Review:
• Update new structural information sheet (format change)
• Standardization of format/tables.
• Added under Description:
"The structure consists of two (2) 5.0 feet high by 10.0 feet wide gates
with sill elevations of -1.8 feet NGVD29. The discharge from the
structure is controlled by two (2) stem operated vertical lift roller
gates. The gates can either be remotely operated from the SFWMD
Operation Control Center or controlled on -site."
• Operation:
Normal and low ranges are added.
Manatee protection paragraph is added.
Backup generator paragraph is added.
Water
Managers
Approval
01/13/2020
Final review and approval.
A1-32
G-119 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
DESCRIPTION
The structure G-119 is a double-barreled, cast in place (CIP) concrete box culvert located in the C-4 (Tamiami)
Canal, about 0.25 mile east of the Krome Avenue crossing of the Tamiami Canal, 19 miles west of Miami. The
original structure was replaced in 2015 by Miami -Dade County Park & Recreation during the widening of access
roadway to the Trail Glades Shooting Range facility.
Control is affected by (2) two manually operated 6.0 feet square sluice gates mounted on a frame on the upstream
or west end of the structure. The structure is currently maintained by the Miami Field Station.
PURPOSE
This structure permits supplemental deliveries from Water Conservation Area 3A (WCA-3A) for water supply
needs in eastern Miami -Dade County via the L-30 or L-29 Canals. It can also be used to discharge limited quantities
of excess water from WCA-3A or from the L-31N, L-29, and L-30 drainage basins east and south of WCA-3B when
capacity is available in the C-4 Canal.
OPERATION
This structure is operated to make supplemental deliveries to East Miami -Dade County. Such releases may be
initiated when the headwater stage at either S-25B, S-22 or G-93 falls below the optimum stage of 2.0 feet
NGVD29 during dry periods. The structure may also be used to make flood releases when downstream conditions
will not be aggravated. The structure may also be used to deliver water to Biscayne Bay Coastal Wetlands (BBCW)
if water is available upstream, however this is an inefficient delivery method to BBCW.
Table 1. Discharge Characteristics of Control Structure G-119
DISCHARGE CHARACTERISTICS
Design Discharge
200 cfs'
Optimum Headwater
N/A
Design Headwater Elevation
4.2 feet NGVD29
Design Tailwater Elevation
3.7 feet NGVD29
Design Discharge Flow Type
Controlled Submerged
1 %SPF not provided because the structure is not designed for a specific SPF flood flow. Maximum breakpoint flow
of 355 cfs occurred in January 1995.
Table 2. Description of Control Structure G-119
DESCRIPTION OF STRUCTURE
Type
Cast in Place (CIP) Concrete Gated Box Culvert
Barrels
Number:
2
Size:
6.0 feet diameter
Length:
60.0 feet
Invert Elevation:
-3.5 feet NGVD29
Service Bridge Elevation:
11.20 feet NGVD29
Water Level Which Will Bypass Structure:
10.0 feet NGVD29
A1-33
Publish Date: 1/27/2020
G-119 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
DESCRIPTION OF STRUCTURE
Headwall Top Elevation:
4.9 feet NGVD29
Gates
Number:
2
Size:
6.0 feet high and 6.0 feet wide
Type:
Stainless Steel sluice gate
Gate Control:
Local control
Bottom elevation of gate full open:
9.5 feet NGVD29
Top elevation of gate full closed:
-3.0 feet NGVD29
Stop Logs
Number Per Culvert:
N/A
Size:
N/A
Elevation of Control Weir:
N/A
Canal Description (upstream; downstream)
Bottom width:
Both 40 feet
Bottom elevation:
Both -13.0 feet NGVD29
Side Slope (V): (H):
1:1
Lift Mechanism
Normal Power Source:
No power
Emergency Power Source:
N/A
Type:
Vertical lift
Hydraulic and Hydrology Measurements
Water Level:
Upstream and downstream staff gauges
Gate Position Recorder:
None
Rain Gauge:
N/A
Date of Transfer:
2015
Dewatering Facilities
Storage:
N/A
Type:
N/A
Size:
N/A
Manatee Protection System
N/A
Access
Structure located on C-4 Canal, adjacent to U.S. Highway 41
(Tamiami Trail), 0.25 Miles east of Krome Ave and 1.2 miles
East of S-336.
A1-34
Publish Date: 1/27/2020
G-119 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
S31,
4▪ 'IELD•
CANAL
NORTH LINE CANAL
NORTH LINE CANAL
S335 G423
G4205
G420 w
G119 S380 G421 v
•
G422 z
z
C-4 Detention Basin
CANAL
MTh
Figure 1: Structure G-119 Location
522(
Legend
I Stage Monitor Site
4 CULVERT
B FLUME
Dtil LOCK
PUMP
IA SPILLWAY
• WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
(= West Miami (WMI)
ntiard Pumps
A1-35
G-119 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Figure 2: Structure G-119 Upstream View (photo by S. Hajimirzaie 11/09/2019)
A1-36
Publish Date: 1/27/2020
G-119 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Type
Date
Reason for Change
Water Managers
Approval
01/13/2020
Final review and approval
Water Manager
Review
10/10/2019
• Standardization of format/tables.
• Operational Revisions:
Such releases may be initiated when the headwater
stage at either S-25B, S-22 or G-93 falls below the
optimum stage of 2.0 feet NGVD29 during dry
periods. The structure may also be used to make flood
releases when downstream conditions will not be
aggravated. The structure may also be used to deliver
water to Biscayne Bay Coastal Wetlands (BBCW) if
water is available upstream, however this is an
inefficient delivery method to BBCW.
Structure
Information Sheet
Update
8/14/2019
Update new structural information sheet
Structure
Refurbishment
8/8/2019
• The existing double -barrel, corrugated metal pipe
culvert was replaced (by Miami -Dade Parks,
Recreation and Open Spaces or PROS) in 2015 by a
double -barrel, 6 feet square reinforced -concrete,
gated box culvert.
• Control is affected by (2) two manually operated 6.0
feet square sluice gates mounted on a frame on the
upstream or west end of the structure.
Operations Revisions
01/22/2003
Review Completed. Under "Operation", change as follows:
• Such releases are initiated when the headwater
stage at either S25B or S-22 falls below the
optimum stage of 2.8 2.0 during dry periods. The
structure may also be used to make flood releases
when downstream conditions will not be
aggravated (when the stage at T-5 the junction of C-
4 and C-2 is less than 4.0 3.0).
Field Station
Revisions
07/2002
No Changes
A1-37
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
DESCRIPTION
S-380 is a five -barrel corrugated metal pipe (CMP) culvert located in the C-4 (Tamiami) Canal, approximately 2
miles east of Krome Avenue, west of Miami in western Miami -Dade County.
Control is affected by single stem sluice gates mounted on a frame on the upstream (west end of the structure).
The gates can either be remotely operated from the SFWMD Operation Control Center or controlled on -site. The
structure is currently maintained by the Miami Field Station.
PURPOSE
The purpose of S-380 is to maintain stages to create and preserve nearby wetlands as well as enhance water
supply by providing aquifer recharge. S-380 will be operated to enhance approximately 4,000 acres of wetlands
in the southern end of the adjacent Pennsuco Wetlands and enhance habitat for plants and animals by increasing
surface and subsurface storage of water. This will be accomplished by reducing seepage and drainage out of Water
Conservation Area 3B (WCA-3B). The Pennsuco Wetlands cover approximately 13,000 acres. Pennsuco is bordered
on the west and north by Krome Avenue, to the south by Tamiami Trail (US 41) and to the east by the Dade-
Broward Levee.
In addition, the structure will permit supplemental deliveries from Water Conservation Area 3A (WCA-3A) to
supply water needs in eastern Miami -Dade County via the L-30 or L-29 Canals.
OPERATION
S-380 will be operated to maintain an optimum headwater stage of 4.0 feet NGVD29. This optimum stage will
allow for seepage reduction to be extended from G-119 to 5-380 (Dade-Broward Levee). Also, when supplemental
water supply deliveries from WCA-3A are made to supply water needs in eastern Dade County via the L-30 or L-
29 canals, S-380 will be opened in conjunction with G-119, and water levels may vary from the optimum.
Dry Season Criteria (December through May)
The structure will operate to maintain a stage range between 3.8 feet NGVD29 to 4.2 feet NGVD29.
Wet Season Criteria (June through November)
S-380 typically remains open during the wet season effectively maintaining the control of this reach of
canal at G-119.
When the stage at the T5W stage monitoring station reaches elevation of 4.0 feet NGVD29, S-380 will be
partially closed to limit discharges through only one culvert barrel. Therefore, 4 of the 5 culvert gates will
be closed completely. Should the stage at T5W increase to 4.5 feet NGVD29 all gates at S-380 will be
closed until the stage at T5W recedes to 4.0 feet NGVD29.
Water Supply Criteria
The structure will permit supplemental deliveries from WCA-3A to supply water needs in eastern Miami -
Dade County via the L-30 or L-29 canals.
A1-38
Publish Date: 7/26/2024
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Flood Control Criteria
During storm events, S-380 may be opened to allow for pre -storm operations to lower the C-4 canal
from G-119 to the coast. This operation will typically be necessary during the dry season because the
gates maybe closed due to the normal dry season operating criteria stated above.
Table 1. Discharge Characteristics of Control Structure S-380
DISCHARGE CHARACTERISTICS
Design Discharge
400 cfsl
Optimum Headwater
N/A
Design Headwater Elevation
N/A
Design Tailwater Elevation
N/A
Design Discharge Flow Type
Controlled Submerged
Storm Surge - MOM Elevation2
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category 4
N/A
Hurricane Category 5
11.46 feet NGVD29
1 %SPF not provided because the structure is not designed for a specific SPF flood flow.
'-MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of
Water with high tide as initial condition).
A1-39
Publish Date: 7/26/2024
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Table 2. Description of Control Structure S-380
DESCRIPTION OF STRUCTURE
Type
Gated Corrugated Metal Pipe (CMP) Culvert
Barrels
Number:
5
Size:
6.0 feet diameter
Length:
96.0 feet (94.5, 94.3, 94.8, 94.4, and 94.5 feet for culverts 1
to 5, respectively. Source: STRIVE Report 9/10/04)
Invert Elevation:
-3.0 feet NGVD29
Service Bridge Elevation:
9.8 feet NGVD29
Water Level Which Will Bypass Structure:
9.4 feet NGVD29 (STRIVE 2004, taken on top of levee at the
south end of the structure)
Headwall Top Elevation:
N/A
Gates
Number:
5
Size:
6.0 feet high by 6.0 feet wide
Type:
Stainless Steel
Gate Control:
Local and remote control
Bottom elevation of gate full open:
4.0 feet NGVD29
Top elevation of gate full closed:
3.0 feet NGVD29
Stop Logs
N/A
Canal Description (upstream; downstream)
Bottom width:
40 feet
Bottom elevation:
-13.0 feet NGVD29
Side Slope (V): (H):
1:1
Lift Mechanism
Normal Power Source:
Commercial power
Emergency Power Source:
L.P. gas driven generator
Type:
Vertical lift
Hydraulic and Hydrology Measurements
Water Level:
Upstream and downstream staff gauges and Telemetered
Headwater (HW) and Tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Rain Gauge:
N/A
Date of Transfer:
N/A
Dewatering Facilities
N/A
Manatee Protection System
Yes (450 feet downstream of the structure)
Access
Structure located on C-4 Canal, adjacent to U.S. Highway 41
(Tamiami Trail), about 2.0 Miles east of Krome Ave.
Al-40
Publish Date: 7/26/2024
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
NORTH LINE CANAL
NORTH LINE CANAL
G423 3
G42OSY
G420 w
5380_ , G421 chi
C 4 G422 O
C-4 Detention Basin
Ares shown
on main map
LOCATION MAP
C4.CORAL
_~-S12D
b I
Figure 1: S-380 Location
Legend
• Stage Monitor Ste
Q CULVERT
FLUME
Pi] LOCK
a PUMP
II SPILLWAY
• WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+,Eca Nard Pumps 4
C•5— S25
S22f
A1-41
Publish Date: 7/26/2024
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
Figure 2: A trash rake and manatee barrier exist about 450 feet downstream of the S-380.
A1-42
Publish Date: 7/26/2024
S-380 —STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
a
_ -.n�' ■It I r■ _,-
Figure 3: Structure S-380 Upstream (top) and downstream trash rake (bottom) View
A1-43
S-380— STRUCTURE [NAVD88 = NGVD29 -1.56 FEET]
RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Water Manager review
Water
Managers
7/24/2024
Final approval
Structure Information
Sheet Update
Z. Li
7/16/2024
Update new structural information sheet;
operation; and format.
A1-44
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
111111Mir �s
DESCRIPTION of G-420 INFLOW PUMP STATION
G-420 is a three -unit pump station located north of the C-4 Canal at junction of US 41 and SW 137th Ave, in Miami -
Dade County. The pump station is part of FEMA's Hazard Grant Mitigation Program funding with the objective of
implementing a series of improvements including Emergency Detention Basin (EDB) in the C-4 basin to increase
the level of flood protection. The C-4 EDB covers 831 acres and was constructed in two phases.
Construction of the G-420 and G-420S pumps was completed in March 2002. The G-420 can either be remotely
operated from the SFWMD Operation Control Center or controlled on -site. This station is currently maintained by
the Miami Field Station.
PURPOSE
This structure pumps water from C-4 Canal into the C-4 EDB for flood control.
OPERATION
The G-420 inflow pump station will be operated according to the Miami Dade County Flood Mitigation Program,
C-4 Basin Operating Plan (SFWMD, 2024).
Once the stage at T5W monitoring station (2.9 Miles east of the C-4 EDB in C-4 Canal at intersection with the C-2
Canal, west of Florida turnpike) reaches elevation of 4. 0 feet NGVD29, pumping into the EDB begins with either
all 3 pumps at G-420 (total 669 cfs) or all 7 pumps at G-422 (total 623 cfs) turned on. If not already opened, G-423
will be opened fully at this time as well. When T5W stage rises above 4.20 feet NGVD29, pumping into the EDB
will increase to a maximum of 1,292 cfs (G-420 with 3 pumps = 669 cfs plus G-422 with 7 pumps = 623 cfs).
Flood pumping into the EDB shall cease when at least one of the following conditions occurs:
1) Stages in the EDB have reached elevation 8.0 feet NGVD29 and stages at T5W begin to recede below elevation
4.2 feet NGVD29 (also see note below) or;
2) The stage immediately upstream of the G-420 pump station is at or below elevation 2.60 feet NGVD29 or;
3) Stage at T5W recedes indicating that the rest of the system can handle and convey the inflows from the C-4
to tide or;
4) The stage in the EDB has reached a maximum elevation 10.0 feet NGVD29.
Note: When stages in the EDB are at 8.00 feet NGVD29 (half full), the District will assess conditions and forecast
and may temporarily reduce or terminate pumping. If the stage at T5W rises to 4.4 feet NGVD29, then pumping
into the EDB will resume until T5W stage recedes or the EDB is full (10.0 feet NGVD29).
A1-45
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
"NNW
Table 1. Discharge Characteristics of Control Structure G-420
DISCHARGE CHARACTERISTICS
Design Discharge Capacity Total
670 cfs (3x223 cfs)
Design Discharge Capacity Per Pump
223 cfs
Design Headwater Elevation
N/A
Maximum Intake Water Elevation
5.0 feet NGVD291
Minimum Low Water (Headwater) Elevation
3.6 feet NGVD291
Generator Finished Floor Elevation
10.1 feet NGVD29
Storm Surge - MOM Elevation2
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category 4
N/A
Hurricane Category 5
10.67 feet NGVD29
'As -built, drawing sheet 2 of 20
2MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water
with high tide as initial condition).
A1-46
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
'11•Mlir
Table 2. Description of Control Structure G-420
DESCRIPTION OF STRUCTURE
Type
Diesel
Pump
Number:
3
Manufacturer:
Morrison Pump Company
Model:
Cat C-15
Impeller Size:
5.0 feet
Impeller Speed:
1,060 RPM
Engine Speed:
270 RPM
Engine Horsepower:
500 HP
Intake and Discharge Pipe Diameter:
5.0 feet
Discharge Pipe Length:
39.0 feet
Service Bridge Elevation:
10.10 feet NGVD29
Inundation Level (Operating Floor):
10.09 feet NGVD29
Invert elevation
Inlet Pipe:
-9.70 feet NGVD29
Discharge Pipe:
1.5 feet NGVD29
Bottom Elevation of Inlet Bay:
-13.28 feet NGVD29
Power
Normal:
Diesel
Emergency:
N/A
Gate
Type:
Flap gate
Gate Size:
3.5 feet diameter
Hydraulic and Hydrology Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Pump Status:
Telemetry recorder
Rain Gauge:
None
Canal Description (upstream; downstream)
(C-4 Seepage Canal; C-4 EDB)
Bottom width:
10.0 feet (Upstream)
Bottom elevation:
-7.0; 5.5 feet NGVD29
Side Slope (V): (H):
1:1 (Upstream)
Manatee Protection System
N/A
Date of Transfer/Operation:
N/A
Access
This structure can be accessed from the west side
of SW 137th Ave, 100 north of SW 8th St (SR 41). The
gate is 1.1 miles west of SW 137th Ave.
A1-47
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
11MIEr 11111s
DESCRIPTION of G-420S SEEPAGE PUMP
G-420S seepage pump is one unit, submersed electric pump located just to the northeast of G-420. Construction
of the G-420 and the G-420S pumps was completed in March 2002. The G-420S pump was replaced in April 2006.
The station can either be remotely operated from the SFWMD Operation Control Center or controlled on -site.
PURPOSE
G-420S pumps water collected in the C-4 West seepage Canal, which runs from north to south along the north
EDB levee, back into the C-4 EDB.
OPERATION
Pump can be operated to keep C-4 West seepage Canal between 4.0 to 5.0 feet NGVD29.
Table 1. Discharge Characteristics of Control Structure G-420S
DISCHARGE CHARACTERISTICS
Design Discharge
100 cfs
Design Discharge Capacity Per Pump
100 cfs
Design Headwater Elevation
10.6 feet NGVD29'
Maximum Intake Water Elevation
N/A
Minimum Low Water (Headwater) Elevation
0.9 feet NGVD292
Storm Surge - MOM Elevation3
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category 4
N/A
Hurricane Category 5
10.67 feet NGVD29
'Structure Inspection Program (SIP), pp 2, September 2008.
2As-built, drawing sheet 2 of 20.
3 MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water
with high tide as initial condition).
A1-48
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
"IIIIMIlr
Table 2. Description of Control Structure G-420S
DESCRIPTION OF STRUCTURE
Type
Horizontal Submersible Electric
Pump
Number:
1
Manufacturer:
MWI
Model:
Not available
Impeller Size:
3.5 feet
Impeller Speed:
305 RPM
Engine Speed:
1,800 RPM
Engine Horsepower:
125 HP
Intake and Discharge Pipe Diameter:
3.5 feet
Discharge Pipe Length:
42.0 feet
Service Bridge Elevation:
13.0 feet NGVD29
Inundation Level (Operating Floor):
N/A
Invert elevation
Inlet Pipe:
-3.1 feet NGVD 29
Discharge Pipe:
-3.0 feet NGVD29
Bottom Elevation of Inlet Bay:
-3.1 feet NGVD29
Power
Normal:
Commercial electricity
Emergency:
No back up power
Gate
Type:
Flap gate
Gate Size:
3.5 feet diameter
Hydraulic and Hydrology Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Pump Status:
Telemetry recorder
Rain Gauge:
None
Canal Description (upstream; downstream)
(C-4 West Seepage Canal; C-4 EDB)
Bottom width:
10.0 feet (Upstream)
Bottom elevation:
-7.0; 5.5 feet NGVD29
Side Slope (V): (H):
1:1 (Upstream)
Manatee Protection System
N/A
Date of Transfer/Operation:
2004
Access
This structure can be accessed from the west side
of SW 137th Ave, 100 north of SW 8th St (SR 41). The
gate is 1.1 miles west of SW 137th Ave.
A1-49
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
Legend
Y Stage Monitor Site
Q CULVERT
I=1 FLUME
h] LOCK
PUMP
d SPILLWAY
® WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+FJM Iard Pumps 1
NORTH LINE CANAL
NORTH LINE CANAL
J
z
S335 G423
G420S
G420 W
G119 5380._ G421 t�s
C-4 G� 4=2
z
C-4 Detention Basin
LOCATION MAP
C4.COF�iAL
•
•
G93
S22r
C•5—S25
Figure 1: Location of G-420 and G-420S pump stations on C-4 EDB northern section (EDBN)
A1-50
G-420 and G-4205— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
Monitoring
Station ID
C4EDBSW
C4GW1
G42O
G42O5
G421
G422
G423
Easting
840185
837606
842440
842404
842424
842411
842228
Northing
521399
523091
523125
523251
522972
520238
523309
C4EDBSW
Figure 2: Location of G-420 and G-420S pump stations as part of C-4 EDB. Monitoring
stations are shown. C-4 EDBN and EDBS encompass 415 and 416 acres,
respectively.
A1-51
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
Figure 3: G-420 Pump Station — Looking west
[Upstream and downstream photos]
Figure 4: G-420S Pump Station
A1-52
Publish Date: 7/26/2024
G-420 and G-420S— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
G-420 RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Corrections
Z. Li /A. Nasr
7/3/2024
Updated Operations to C-4 EDB Operating
Plan (July 2024)
Correction
A. Zuniga
11/30/2023
Structure Information Sheet Update:
• Updated type of structure from
"Electric" to "Diesel".
• Updated Normal Power from
"Commercial electricity" to
"Diesel".
• Updated Emergency Power from
"Onan Diesel generator" to "N/A".
Water Managers
Approval
1/13/2020
Final review and approval.
WM Review
9/26/2019
Structure Information Sheet Update:
• Update new structural information
sheet.
• Standardization of format/tables.
• Operational Revisions
Update format
S. Hajimirzaie
8/22/2019
C-4 EDB Permit updates
Editorial
C. Qi
9/2/2015
Updated Low Level Shutoff per Design and
As -built. Update format of the document
Fact check
S. Sylvester
2/3/2015
N/A
Verify component
upgrade
4/30/2012
RACU Replacement Project
Survey
1/22/2008
NAVD 88 conversion factor was added
A1-53
G-420 and G-4205— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET]
G-420S RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Correction
A. Zuniga
3/2/2023
Corrected design discharge based on
manufacturer's pump performance curve
Water Managers
Approval
1/13/2020
Final review and approval.
WM Review
9/26/2019
Structure Information Sheet Update:
• Update new structural information
sheet.
• Standardization of format/tables.
• Operational Revisions
Update format
S. Hajimirzaie
8/22/2019
C-4 EDB Permit updates
Format
J. Brecher
7/22/2015
Update format of document
A1-54
G-421 — STRUCTURE [NAVD88 = NGVD29 - 1.57 FEET].
DESCRIPTION
Structure G-421 is a reinforced concrete, gated spillway located at C-4 Emergency Detention Basin (EDB),
immediately south of G-420 pump station. The C-4 EDB covers 831 acres. The structure consists of one (1) 4.0 feet
high by 20.8 feet wide gate with sill elevation of 6.0 feet NGVD29. The discharge from the structure is controlled
by one (1) electronically driven cable operated vertical lift gates. The gate can either be remotely operated from
the SFWMD Operation Control Center or controlled on -site.
The G-421 was constructed in 2004 and is currently maintained by Miami Field Station.
PURPOSE
The structure is the outlet spillway of the C-4 EDB. This structure is used to release water from the detention basin
after the storm event has passed.
OPERATIONS
The G-421 will be operated according to the Miami Dade County Flood Mitigation Program, C-4 Basin Operating
Plan (SFWMD, 2024).
The District will consider commencing discharges out of the EDB through structure G-421 once the storm event
has passed and the stage at T5W recedes below elevation 4.0 feet NGVD29. The discharges will be regulated to
not exceed 4.0 feet NGVD29 at T5W. Gate operations will be performed while monitoring stages at T5W and C-4
Coral. If the stages in the C-4 Canal allow it (T5W stage is below elevation 4.0 feet NGVD29 and stage trend is
receding), the gate opening may be increased, until the EDB is completely emptied.
Table 1. Discharge Characteristics of Structure G-421
DISCHARGE CHARACTERISTICS
Design Discharge
N/A'
SPF Discharge
N/A
Design Headwater Elevation
N/A
Design Tailwater Elevation
N/A
SPF Headwater Elevation
N/A
SPF Tailwater Elevation
N/A
Type of Discharge
N/A
Storm Surge - MOM Elevation2
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category4
N/A
Hurricane Category 5
10.67 feet NGVD29
'Existing flow rating equation provides a maximum flow of 480 cfs (Uncontrolled free, Headwater 10 feet NGVD29, tailwater 3.5 feet
NGVD29). Maximum observed breakpoint flow in POR (2004-2019) is 81 cfs (Jan 16, 2013).
2MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high
tide as initial condition).
A1-55
Publish Date: 7/26/2024
G-421 — STRUCTURE [NAVD88 = NGVD29 - 1.57 FEETI
Table 2. Hydraulic Description of Structure G-421
DESCRIPTION OF STRUCTURE
Type
Fixed crest reinforced concrete gated spillway
Weir crest:
Ogee
Net crest length:
20.0 feet
Crest elevation:
6.0 feet NGVD29
Service bridge elevation:
13.06 feet NGVD29
Water level which will bypass structure:
13.0 feet NGVD29
Gates
Number:
1
Size:
4.0 feet high by 20.81 feet wide
Type:
Vertical lift
Gate Control:
Remote and automatic on -site control
Bottom elevation of gate full open:
12.0 feet NGVD29
Top elevation of gate full closed:
10.0 feet NGVD29
Apron
Apron elevation:
-3.0 feet NGVD29
Apron length:
32.0 feet
End sill elevation:
-2.0 feet NGVD29
Riprap Length (downstream):
25.0 feet
Canal Description (upstream and downstream)
(C-4 EDB; C-4 Seepage Canal)
Bottom width:
N/A; 10 feet
Bottom elevation:
5.5; -7.0 feet NGVD29
Side Slope (V): (H):
1:1
Lift Mechanism
Normal Power Source:
Commercial electricity
Emergency Power Source:
N/A
Type:
Electric driven cable drum
Hydraulic and Hydrologic Measurements
Water Level:
Telemetered headwater (HW) and tailwater (TW)
Gate Position Recorder:
Telemetered gate sensor
Date of Transfer:
N/A
Dewatering Facilities
Storage:
N/A
Type:
N/A
Size and Nos (per bay):
N/A
Manatee Protection System
N/A
Access
This structure can be accessed from the west side of
SW 137th Ave, 100 north of SW 8th St (SR 41).
A1-56
Publish Date: 7/26/2024
G-421 — STRUCTURE [NAVD88 = NGVD29 -1.57 FEET].
LINE CANAL
NORTH LINE CANAL
z
C-4 Detention Basin
Area shown
on main mop
LOCATION MAP
STY1
•
C4.CORAL
S720
Figure 1: Structure G-421 Location
Legend
40 Stage Monitor Site
Q CULVERT
B FLUME
▪ LOCK
d PUMP
▪ SPILLWAY
WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+_FondlIrard Pumps
A1-57
G-421 — STRUCTURE [NAVD88 = NGVD29 -1.57 FEET].
Figure 2: Structure G-421 — External View (Looking East)
Monitoring
Station ID
Figure 2: G-421 outlet spillway as part of C-4 EDB. Monitoring stations are shown.
A1-58
Publish Date: 7/26/2024
G-421 — STRUCTURE [NAVD88 = NGVD29 - 1.57 FEETI
RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Corrections
Z. Li /A. Nasr
7/3/2024
Updated Operations to C-4 EDB
Operating Plan (July 2024)
Water Managers
Approval
01/13/2020
Final review and approval.
WM Review
9/26/2019
Structure Information Sheet Update:
• Update new structural information
sheet.
• Standardization of format/tables.
• Operational Revisions
Structure sheet Update
S. Hajimirzaie
8/21/2019
C-4 EDB Permit updates
Fact Check
and Format
C. Qi
9/4/2015
N/A
Reformatted the tables to be consistent with
other structure information sheets
Formatting
J. Otero
2/9/2015
Initial creation under new format
A1-59
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
DESCRIPTION
The G-422 is a seven -unit, electric submersible pump located north of C-4 Canal at junction of US 41 and SW 137th
Ave, in Miami -Dade County. The pump station is part of FEMA's Hazard Grant Mitigation Program Funding with
the objective of implementing a series of improvements including an Emergency Detention Basin (EDB) in the C-4
basin to increase the level of flood protection. The C-4 EDB covers 831 acres and was constructed in two phases.
The G-422 (EDB southern cell) was installed in 2004 and can either be remotely operated from the SFWMD
Operation Control Center or controlled on -site. This structure is currently maintained by the Miami Field Station.
PURPOSE
The structure is to pump water from C-4 Canal into the southern cell of the C-4 EDB for flood control.
OPERATION
The G-422 will be operated according to the Miami Dade County Flood Mitigation Program, C-4 Basin Operating
Plan (SFWMD, 2024).
Once the stage at T5W monitoring station (2.9 Miles east of the C-4 Detention Basin in C-4 Canal at intersection
with the C-2 Canal, west of Florida turnpike) reaches elevation of 4. 0 feet NGVD29, pumping into the EDB begins
with either all 3 pumps at G-420 (total 669 cfs) or all 7 pumps at G-422 (total 623 cfs) turned on and pumping into
the EDB shall begin. If not already opened, G-423 will be opened fully at this time as well. When T5W stage rises
above 4.20 feet NGVD29, pumping into the EDB will increase to a maximum of 1,292 cfs (G-420 with 3 pumps =
669 cfs plus G-422 with 7 pumps = 623 cfs).
Flood pumping into the EDB shall cease when at least one of the following conditions occurs:
1) Stages in the EDB have reached elevation 8.0 feet NGVD29 and stages at T5W begin to recede below elevation
4.2 feet NGVD29 (also see note below) or;
2) The stage immediately upstream of the G-420 pump station is at or below elevation 2.6 feet NGVD29 or;
3) Stage at T5W recedes indicating that the rest of the system can handle and convey the inflows from the C-4
to tide or;
4) The stage in the EDB has reached a maximum elevation 10.0 feet NGVD29.
Note: When stages in the EDB are at 8.00 feet NGVD29 (half full), the District the District will assess conditions
and forecast and may temporarily reduce or terminate pumping. If the stage at T5W rises to 4.4 feet NGVD29,
then pumping into the Detention Basin will resume until T5W stages recede or the EDB is full (10.0 feet NGVD29).
A1-60
Publish Date: 7/26/2024
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
Table 1. Discharge Characteristics of Control Structure G-422
DISCHARGE CHARACTERISTICS
Design Discharge
623 cfs (7x 89 cfs)
Design Discharge Capacity Per Pump
89 cfs
Design Headwater Elevation
N/A
Design Tailwater Elevation
N/A
Maximum Tailwater elevation
10.0 feet NGVD29
Minimum Low Water (Headwater) Elevation
4.0 feet NGVD29'
Generator Finished Floor Elevation
12.35 feet NGVD29
Storm Surge - MOM Elevation2
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category 4
N/A
Hurricane Category 5
10.87 feet NGVD29
'Pump stations miscellaneous detail sheet S7 by URS, 4/25/2003.
2MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water
with high tide as initial condition).
A1-61
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
Table 2. Description of Control Structure G-422
DESCRIPTION OF STRUCTURE
Type
Electric Horizontal Submersible Pump
Pump
Number:
7
Manufacturer:
MWI
Model:
SEA 342
Impeller Size:
3.5 feet
Pump Speed:
297 RPM
Engine Speed:
1,800 RPM
Engine Horsepower:
125 HP
Discharge Pipe Diameter:
3.5 feet (Intake is a cone)
Discharge Pipe Length:
2.0 feet
Service Bridge Elevation:
12.27 feet NGVD29
Inundation Level (Operating Floor):
N/A (Submersible Pump)
Invert elevation
Inlet Cone:
-5.1 feet NGVD29 (approximate)
Discharge Pipe:
-5.1 feet NGVD29
Bottom Elevation of Inlet Bay:
-6.6 feet NGVD29
Power
Normal:
Commercial electricity; Commercial Diesel (6,000-
gal tank)
Emergency:
Two 450 KW and one 200 KW Onan generator
Gate
Type:
Flap gate (downstream end of discharge pipe)
Gate Size:
3.5 feet
Hydraulic and Hydrology Measurements
Water Level:
Telemetered Headwater (HW) and Tailwater (TW)
Pump Status
Telemetry recorder
Rain Gauge:
None
Canal Description (upstream; downstream)
(C-4 Seepage Canal; C-4 Detention Pond)
Bottom width:
10: N/A feet
Bottom elevation:
-7.0; 5.5 feet NGVD29
Side Slope (H): (V):
1:1 (Upstream)
Manatee Protection System
N/A
Date of Transfer:
N/A
Access
This structure can be accessed from the west side
of SW 137th Ave, 100 north of SW 8th St (SR 41). The
gate is 1.1 miles west of SW 137th Ave.
A1-62
Publish Date: 7/26/2024
G-422— PUMP STATION [NAVD88 = NGVD29 -1.57 FEET].
S335
/ G119 S3
11
Area shown
on main map
LOCATION MAP
NORTH LINE CANAL
NORTH LINE CANAL
S1
C4.CORAL
1
522`
Legend
• Stage Monitor Site
Q CULVERT
B FLUME
▪ LOCK
PUMP
M SPILLWAY
• WEIR
Primary
Secondary
Municipal Pumps
• Belen (MDB)
Sweetwater (SWE)
City of Miami (CITMIA)
West Miami (WMI)
S26+_Fondrard Pumps
Figure 1: Location of G-422 Pump Station on C-4 EDB Southern section (EDBS)
A1-63
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
Monitoring
Easting Northing
Station ID
C4EDBSW 840185 521399
C4GW1 837606 523091
G420 842440 523125
G4205 842404 523251.
G421 842424 522972
G422 842411 520238
G423 842228 523309
C4GW1
Figure 2: G-422 Pump Station as Part of C-4 EDB. Monitoring stations are shown. C-4
EDBN and EDBS encompass 415 and 416 acres, respectively.
A1-64
Publish Date: 7/26/2024
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
Figure 3: G-422 Pump Station. The submersible pumps were first used by the District as forward Lake Okeechobee
pumps in 2001.
A1-65
Publish Date: 7/26/2024
G-422— PUMP STATION [NAVD88 = NGVD29 - 1.57 FEET].
RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Corrections
Z. Li /A. Nasr
7/3/2024
Updated Operations to C-4 EDB Operating Plan
(July 2024)
Water Managers
Approval
01/13/2020
Final review and approval.
WM Review
9/26/2019
Structure Information Sheet Update:
• Update new structural information
sheet.
• Standardization of format/tables.
• Operational Revisions
Update format
S. Hajimirzaie
8/22/2019
C-4 EDB Permit updates
Format
J. Brecher
7/22/2015
Update format of document
Survey Section
Revision
N/A
Operations
Revisions
N/A
Field Station
Revisions
N/A
A1-66
STRUCTURE G-423 — [NAVD88 = NGVD29 - 1.57 FEETI
DESCRIPTION
Structure G-423 is a six (6) barrel, bi-directional, concrete box culvert located at C-4 Emergency Detention Basin (EDB),
Miami -Dade County. The C-4 EDB covers 831 acres. The structure consists of six (6) 5.0 feet high by 10.0 feet wide
vertical lift gates. The gates can either be remotely operated from the SFWMD Operation Control Center or
controlled on -site. The structure is currently maintained by Miami Field Station.
PURPOSE
The G-423 is an inter -cell transfer structure connecting northern and southern cells of C-4 EDB. The G-423 is used to
transfer water between the north and south cells of the C-4 EDB as needed.
OPERATION
The G-423 will be operated according to the Miami Dade County Flood Mitigation Program, C-4 Basin Operating
Plan (SFWMD, 2024). The gates are usually left fully open.
Once the stage at T5W monitoring station (2.9 Miles east of the C-4 Detention Basin in C-4 Canal at intersection
with the C-2 Canal, west of Florida turnpike) reaches elevation of 4.0 feet NGVD29, pumping into the EDB begins
with either all 3 pumps at G-420 (total 669 cfs) or all 7 pumps at G-422 (total 623 cfs) turned on. If not already
opened, G-423 will be opened fully at this time as well. When T5W stage rises above 4.2 feet NGVD29, pumping
into the EDB will increase to a maximum of 1,292 cfs (G-420 with 3 pumps = 669 cfs plus G-422 with 7 pumps =
623 cfs).
Note: The northern cell of the C-4 EDB is intended to be mined in the future. There is no required change in
operations or restrictions on operations once mining begins. The entire EDB will continue to be fully available
before, during, and after mining operations. The G-423 culverts may at times be closed to facilitate mining
operations when conditions allow and potentially during some rain events if conditions allow. However, there is
no requirement to keep the G-423 culverts closed. The G-423 culverts can and will be opened by the SFWMD.
Table 1. Discharge Characteristics of Control Structure G-423
DISCHARGE CHARACTERISTICS
Design Discharge
N/A'
Optimum Headwater Elevation
N/A
Design Headwater Elevation
N/A
Design Tailwater Elevation
N/A
Design Discharge Flow Type
Submerged, uncontrolled
Storm Surge - MOM Elevation2
Hurricane Category 1
N/A
Hurricane Category 2
N/A
Hurricane Category 3
N/A
Hurricane Category 4
N/A
Hurricane Category 5
10.67 feet NGVD29
'Maximum breakpoint flow in 2004-2019 is 475 cfs (Dec 9, 2015).
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Publish Date: 7/26/2024
STRUCTURE G-423 — [NAVD88 = NGVD29 - 1.57 FEETI
2MOM Elevation is SLOSH (2009-2010) model output corresponding to maximum of MEOW (Maximum Envelope of Water with high tide
as initial condition).
Table 2. Hydraulic Description of Control Structure G-423
DESCRIPTION OF STRUCTURE
Type
Precast concrete, gated box culvert
Barrels
Number:
6
Size:
5.0 feet high by 10.0 feet wide
Length:
30.0 feet
Invert Elevation:
5.0 feet NGVD29
Service Bridge Elevation:
13.0 feet NGVD29
Water Level Which Will Bypass Structure:
13.0 feet NGVD29
Headwall Top Elevation:
N/A
Gates
Number:
6
Type:
Slide Gate
Size:
5.0 feet high by 10.0 feet wide
Gate Control:
Vertical Lift
Bottom elevation of gates full open:
9.5 feet NGVD29
Top elevation of gates full closed:
10.0 feet NGVD29
Canal Description (upstream; downstream)
(C-4 EDB)
Bottom width:
N/A
Bottom elevation:
N/A
Side Slope (V): (H):
N/A
Lift Mechanism
Normal Power Source:
Commercial Electricity
Emergency Power Source:
L.P. Gas driven generator at G-420
Type:
Vertical Lift
Dewatering Facilities
Storage:
N/A
Type:
N/A
Size:
N/A
Hydraulic and Hydrology Measurements
Water Level:
Upstream and downstream staff gauges and Telemetered
Headwater (HW) and Tailwater (TW)
Gate Position:
Digital Sensor
Rain Gauge:
N/A
Manatee Protection System
N/A
Date of Transfer/Operation:
2005
Access
This structure can be accessed from the west side of SW
137th Ave, 100 north of SW 8th St (SR 41). The gate is 1.1 miles
west of SW 137th Ave.
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Publish Date: 7/26/2024
STRUCTURE G-423 — [NAVD88 = NGVD29 -1.57 FEET1
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C-4 Detention Basin
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Z Stage Monitor Site
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Primary
Secondary
Municipal Pumps
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Sweetwater (SWE)
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Figure 1: Location of G-423 Culvert along with the C-4 basin components. C-4 EDBN and EDBS
encompass 415 and 416 acres, respectively.
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STRUCTURE G-423 — [NAVD88 = NGVD29 - 1.57 FEETI
Figure 2: External View of Structure G-423: (top) Headwater, (bottom) Tailwater
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Publish Date: 7/26/2024
STRUCTURE G-423 — [NAVD88 = NGVD29 -1.57 FEET].
RECORD OF CHANGE
Type
Editor (s)
Date
Reason for Change
Corrections
Z. Li /A. Nasr
7/3/2024
Updated Operations to C-4 EDB
Operating Plan (July 2024)
Water Managers
Approval
01/13/2020
Final review and approval.
WM Review
9/26/2019
Structure Information Sheet Update:
• Update new structural information
sheet.
• Standardization of format/tables.
• Operational Revisions
Update format
S. Hajimirzaie
8/22/2019
C-4 EDB Permit updates.
Standardization
S. Hajimirzaie
5/06/2019
Standardization of formats, languages, tables,
and adding figures.
Format
J. Brecher
7/16/15
Update format of document.
A1-71