HomeMy WebLinkAboutSite Utility StudyApril 2004
SMA- South Miami Avenue
MAJOR USE SPECIAL PERMIT
SITE UTILITY STUDY
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PREPARED FOR
Cabi Developers, Inc.
KHA Project No.: 042501000
Prepared by:
KIMLEY-HORN AND ASSOCIATES, INC.
1691 Michigan Ave. Suite 400
MIAMI BEACH, FL 33139
s
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Site Utility Study
Introduction
The SMA — South Miami Avenue is a proposed mixed -use development to be located
between SW lst Avenue and South Miami Avenue from SW 14th Street to SW 14th
Terrace, on approximately 2.783 acres, in the City of Miami, Miami -Dade County,
Florida (see Attachment "A" Site Location Map). The site currently consist of: three 1-
story residential buildings, six 2-story buildings exist and an asphalt parking lot, all of
which are to be demolished as part of this project. The SMA project consists of two high
rise residential towers. The tallest of the two towers will be a 56 story building, while the
second tower will stand 52 stories tall. It will include approximately 832 residential
apartment units, 108,543 S.F. of office space, 47,853 S.F. of retail and approximately
1,280 parking spaces. See Table 1, below for further details of the proposed project.
Residential
Table 1:
Project Summary
832
1,163,548
Office/Condo
108,543
Retail
47,853
Parking
1,280 spaces
Total
1,319,944
SMA -- South Miami Avenue
Site Utility Study Page
• I. Drainage
Relative to the above -referenced project, the following information should be used during the
storm water management design and site grading.
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Flood Criteria:
The proposed project site grade elevations will be designed to meet flood criteria according
to Federal State, Miami -Dade County and City of Miami standards as follows:
1. The subject project is located in PANEL 183 of COMMUNITY -PANEL NUMBER
12025C0183 I of the Flood Insurance Rate Map (FIRM). According to the National
Flood Insurance Program, the project is in Zone X/D, for which a base flood elevation
has not been undetermined. The closest base flood elevation is 11.0 ft NGVD.
2. Miami -Dade County Flood Criteria elevation as per Amended Plat of Flood Criteria
Map, plat book 120, page 13 is estimated to be 5.0 ft. NGVD. This will be used to
determine proposed site grading minimum grade elevations.
3. The average October ground water level elevation is estimated to be 2.0 ft. NGVD. This
elevation will be used to compute drainage well capacity and roadway base clearance.
(Source: Dade County Depaitinent of Environmental Resource Management & Miami -
Dade County Public Works Manual, Volume 11- Design Standard Detail WC 2-2).
Existing Drainage
Presently, the site is partially developed. Based on site observations and available
information, there is an existing drainage system which currently serves the existing
building and asphalt parking lot. The existing drainage system will be demolished and a
new stormwater management system will be constructed to retain the runoff generated by
the proposed improvements, as required by code (see below).
Proposed Drainage System
The drainage system for the proposed development will consist of drainage wells and
exfiltration trench, if possible, to facilitate on -site disposal of stow' water runoff. The 5-
year design storm event will be used to design the stoini water management system, in
accordance with Section D-4, "Water Control", of Part 2 of the Miami -Dade County
Public Works Manual.
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Based on preliminary calculations, it is anticipated that three (3) 24" drainage wells will
provide sufficient capacity to dispose of the design 5-year 24-hour storm water runoff
generated by the proposed development. Preliminary drainage computations for the
project areas are provided in Attachment "B" Preliminary Drainage Well Calculations,
which includes the basis for design.
The final drainage design for the project should be in conformance with the requirements
of the Miami -Dade County DERM Water Control Section, Florida Department of
Environmental Protection, and other local, state and federal regulatory agencies having
jurisdiction over the project.
II. Water Distribution System
The water mains owned and operated by the Miami -Dade Water and Sewer Department
(MDWASD) in the vicinity of the project are shown in the Table 3.
Table 3:
Existing Water Mains
(Per MDWASD Water Atlas Sheet)
SW 1st Avenue
SW 14`h Street and SW 14th Terrace
12"
S Miami Avenue
SW 14th Street and SW 14th Terrace
8"
16"
SW 14th Street
SW 1st Avenue and S Miami Avenue
6"
SW 14th Terrace
SW ls` Avenue and S Miami Avenue
8"
Per the MDWASD Water Atlas, an existing 12-inch water main fronts the property along
SW 1st Avenue. There is also a 16-inch water main along S. Miami Avenue. In
SMA -- South Miami Avenue
Site Utility Study
Page 3
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accordance with Miami -Dade Water and Sewer Department (MDWASD) criteria, the
developer may be required to construct a new 1 2-inch ductile iron (DI) water main along
SW 14th Street. A final detenriination of the points of connection and requirements will
not be provided by MDWASD until a Water and Sewer Agreement is requested by the
owner and/or the Hydraulic Analysis done by MDWASD is completed. Water service
meters will be installed by MDWASD forces at owner's expense. Service lines for
domestic water, fire sprinkler systems and irrigation could be connected from the existing
water distribution system.
See Attachment "C" for a copy of the MDWASD water atlas sheet for the project area.
III. Sanitary Sewer Collection System
Table 4 depicts the sanitary sewer mains owned and operated by Miami -Dade Water and
Sewer Department (MDWASD), within the vicinity of the project.
Table 4:
Existing Sanitary Sewer Mains
(Per MDWASD Sewer Atlas Sheet)
SW 1s` Avenue
SW 14th Street and SW 14th Terrace
8" Gravity Main
(South Half of SW 1 s` Ave)
S Miami Avenue
SW 14th Street and SW 14`h Terrace
8" Gravity Main
SW 14'h Street
SW lsf Avenue and S. Miami Avenue
8" Gravity Main
SW 14`h Terrace
SW 1s1 Avenue and S. Miami Avenue
8" Gravity Main
Similar to the wateiniain, an agreement with M-Dade County Water and Sewer
Department (MDWASD) will be required for final deteiinination of the points of
SMA - South Miami Avenue
Site Utility Study
Page 4
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connection. Public improvement requirements will not be provided by MDWASD until a
Water and Sewer Agreement is requested by the owner. The proposed on -site sanitary
sewer system for the property can be connected to the either of the existing mains
abutting the property; provided that the line has capacity to handle the existing flows plus
the additional flows contributed by the proposed project. A letter of availability and
further coordination with MDWASD is recommended to verify the proposed sanitary
sewer service connection points and requirements for this project. MDWASD may
require upgrades to the sanitary sewer system, but this can not be determined without a
request for a water and sewer agreement. A copy of the MDWASD Sewer Atlas sheet has
been attached (See Attachment C).
The flows from the existing MDWASD sanitary sewage mains on South Miami Avenue,
SW 14th Streets and 14th Terrace are received by MDWASD Regional Pump Station #8,
which is located at 1109 Brickell Avenue. Pump Station No. 8 is currently operating at an
average yearly NAPOT of 4.25 hours/day, and is presently not under any type o f moratorium
(see attached pump station report). It is not anticipated that any improvements to the regional
pumping and/or transmission systems will be required to connect the proposed project.
However, a final deteitnination regarding the status of the existing transmission system and
the need for possible improvements will not be made until construction plans are submitted
to the Miami -Dade County DERM Wastewater Section and a Sanitary Sewage System
Capacity Certification Letter is issued.
The flows created by this project have been determined and are shown in Table 5.
Table 5:
Water & Sewer Flow Generation
°
.�,
200 gpd per unit
T al
166,400
Apartment
832 units
Retail
47,853 sf
5 gpd per 100sf
2,393
Office
108,543 sf
10 gpd per 100 sf
10,854
Total Anticipated Flow
179,647 gpd
SMA — South Miami Avenue
Site Utility Study Page 5
. TV. Solid Waste Generation
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Solid waste generated by this project will be collected in standard on -site containers for
refuse and recyclables. Regular pick-up service will be provided either by private hauling
companies and/or by the City of Miami Solid Waste Department, who will transport the
waste to Miami -Dade County's or private disposal and recycling facilities. The volumes of
solid waste projected to be generated by the project are shown in Table 6.
Table 6:
Solid Waste Generation
Te
i cea pa cv
as
age ate
Tr tai of d
Waste ,
Generated
Apartment
832 units
5lbs/unit/day
2.08
Retail
47,853 sf
61bst1000 sf/day
0.14
Office
108,543 sf
6lbs/1000 sf/day
0.33
Total Anticipated Solid Waste Generated
2.55
V. Utility Easement
According to the survey by McLaughlin Engineering Company, there is a 3', and a 5'
wide FPL Easement and a 12' Ingress/Egress Easement within the site. If the proposed
improvements are in conflict with said easements and consequently the existing FPL
facilities (overhead lines, poles etc.) the easement will have to be removed by plat. In
addition, the FPL facilities will have to be relocated to accommodate the improvements
which may require another easement.
SMA — South Miami Avenue
Site Utility Study Page 6
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Attachment A
Site Location Map
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NE T1
Kimley-Horn and Associates, Inc.
1691 Michigan Avenue
Suite 400
Mica Beach, Florida 33139
Phone; 305-673--2025
Fax: 305--673-4E82
"----,VV 't r I� ..�
SMA - SOUTH MIAMI AVE.
SITE LOCATION MAP
Kimley-Horn and Associates, Inc.
11111
❑:o
1691 Michigan Avenue
Suite 400
Miami Beach, Ftoridc 33139
Phone: 305-673-2025
Fax: 305-673-4882
SMA - SOUTH MIAMI AVE.
FLOOD CRITERIA MAP
oterw
6ROWA D GOLF.
ciari
to
Kimley-Horn and Associates, J
�rn�c
tcl
1691 Michigan Ave
Suite 400
Miami Beech, Florida 33139
Phone: 305-673-2025
Fox: 305-673-4882
ECT
LEGEND:
2
(ESi1MAf
ERttAL 1.0 FCKYT
eta ted)
SMA - SOUTH MIAMI AVE.
AVERAGE OCTOBER GROUND
WATER LEVEL 1960-75
C y of
Miami
12.0.50
Kimsey -Horn and Associates, Inc.
1691 Michigan Ave
Suite 400
Miami Beach, florid° 33139
Phone: 305-673-2025
Fox; 305-673-4882
SMA - SOUTH MIAMI AVE.
FIRM. FLOOD INSURANCE
RATE MAP
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Attachment B
Preliminary Drainage Well Calculations
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irRAINAGE CALCULATIONS:;
DR LVAGE WELLS
(M4SS DIAGRAM- DERill C'RITERIA):;'
SMA - South Miami Avenue
City of Miami, Florida
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1. Site Data:
A. Average October Water Table Elevation - '2 00 NGVD M DCPW Manual. 2 Seetton 1?-4, esign Standard WC
B. County Flood Criteria Elevation = 5 00 NGVD <(Count1 Fiood Criteria iap, see Apperndzx A}
C. FIRM. or FEMA Base Flood Elevation = Zone-X/D'(Maplvo_ I202-C9•1S3I 'see 'AppendixA)neare
D. Average Crown Road Elevation = 1'6 26NGVD
E. Average Existing Onsite Grade Elevation 1" 22 NGVD
F. Proposed drainage inlet grate elevation = I00NGVD
2. Total Contributing Drainage Area (A):
A. Impervious Areas:
a) Asphalt and concrete pavement
b) Roof areas 1 1/3 NE building corner =
Total Impervious Area (Al) _
3.96 Acres
7 Acres
48? Acres
3.85 Acres (97%)
B. Pervious areas:
a) Green Areas = 11 Acres (3%)
3. Weighted Runoff Coefficient (C):
Runoff Coefficient Impervious (C 1)
Runoff Coefficient Pervious (C2)
C-[(Al xCI)+(A2xC2)]/A; C=
C x A = Total Contributing Area; C x A =
0.88
3.50 Acres
4. Time required to generate one inch of runoff (per DERM Water Control Section D-4)
Rainfall Intensity (I) = 308.5 / [(48.6 x F-O.11) -) t (0.5895 + F-213)]
Frequency (F) 5 years - Frequency Curve
Q = CIA, V — Qt; VI, in) = Qti ifl ), to, in) = Time to generate 1 inch of runoff
Vo i) = CIAtEI in)
1" x A = CIAto in) ; Solving for to in ), t(i ��) = 1" / (IC)
Time to Generate one inch of run-off t(in) = 11.28 Min.
Time to reach the inlet (te.) 10 00 Min.
Total Time required to generate 1 in of runoff: — 21.28 Min.
DRAINAGE CAL.CS_S+AA
BASIN
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5. Cumulative Runoff (inflow Mass Diagram)
{
8
10
15
21.28
30
40
50
60
90
120
180
480
600
900
1277
1800
2400
3000
3600
5400
7200
10800
3.498
3.498
3.498
3.498
3.498
3.498
3.498
3.498
3.498
3.498
3.498
6.405
6.166
5.641
5.096
4.493
3.956
3.534
3.193
2.477
2.023
1.480
22.40
21.57
19.73
17.83
15.72
13.84
12.36
11.17
8.66
7.08
5.18
10.754
12,942
17,760
22,758
28.291
33.215
37.088
40,214
46.787
50,951
55,929
6. Drainage Well Design Discharge Rate:
Based on well discharge rate of:
DW-1
16.00
2.00
1.60
GPM/ft. Bead
12.40
13.81
1488
DW-2
16.00
2.00
1.60
12.40
13.81
1488
DW-3
16.00
2.00
1.60
12.40
13.81
1488
Well Discharge Rate (CFS)
7. Detention Time:
41.44 Total Storage (CF)
The drainage well structure must be designed to detain runoff for a minimum of 90 seconds prior to discharge.
Qd = Design Runoff Rate (CFS) =
Vd = Detention Volume (CF) = Qd x 90 sec.
Vd] = Detention Volume Per Well (CF) =
W = Width of Well Structure (ft.) _
L = Length of Well Structure (fit.) =
17.83 CFS
1604.41 CF
534.80 CF
10.0 ft.
12.0 ft.
4464.00
I1m;,, is the minimum depth required from the top of well casing to the floor of the well box to achieve 90 second detention time:
fl,,,;a (ft.) = Vdl / ( W x L) = 4.50 ft.
Top of Well Casing Elev. = 14,00
Elevation at Floor of Well Box (NGVD) = Top of Well Casing Elev. - li;, = 9.50
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8. Excess storm water runoff excluding well structure storage:
8
10
15
21.28
30
40
50
60
90
120
180
480
600
900
1,276.64
1800
2400
3000
3600
5400
7200
10800
41.44
41.44
41.44
41.44
41.44
41.44
41.44
41.44
41.44
41.44
41.44
19,893
24,866
37,299
52,909
74,599
99,465
124,332
149,198
223,797
298,396
447,594
10,754
12,942
17,760
22,758
28,291
33,215
37,088
40,214
46,787
50,951
55,929
-9,139
-11.924
-19,540
-30,150
-46,308
-66,250
-87,243
-108.983
-177,009
-247,444
-391,665
9. Excess storm water runoff including well structure storage:
8
10
15
21.28
30
40
50
60
90
120
180
480
600
900
1,276.64
1800
2400
3000
3600
5400
7200
10800
10,754
12,942
17,760
22,758
28,291
33,215
37.088
40,214
46.787
50.951
55.929
4,464
4,464
4,464
4,464
4,464
4,464
4,464
4,464
4,464
4,464
4,464
19,893
24,866
37,299
52,909
74,599
99,465
124,332
149,198
223,797
298,396
447,594
-13,603.02
-16,388.35
-24,003.85
-34,614.40
-50,771.98
-70,714.23
-91,707.40
-113,447.50
-181,473.48
-251,908.48
-396,128.84
Safety Factor
2.32%
Safety Factor
2.89%
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Attachment C
Existing Utility Records
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Kimley-Hom and Associates, Inc.
1691 Michigan Avenue
Suite 400
Miami, Florida 33143
Phone: 305-662.6445
Fox: 305-662.6492
SMA - South Miami Avenue
MDWASD WATER ATLAS SHEET
a... -in
IGmley-Horn and Associates, Inc.
1691 Michigan Avenue
Suite 40€1
Miomi, Florida 33143
Phone: 305-662.6445
Fox: 305-662.6492
SMA - South Miami Avenue
MDWASD WATER ATLAS SHEET
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Attachment D
Pump Station Monthly Information
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Pump Station Monthly Information
ation,.30 -0008 Atlas Pg..F15
LAMI DADE WATER & SEWER DEPARTMENT
idr..1109 BRICKELL AVE
Allownship-Range 12-54-41
_ . ET c1ock.Y Telm.Y #Pumps. 2
zrcp Type_C Stn CIass.L Speea.V'Hrspwr.i-
Res flaw(gpd) Proj Napot
Plans.. 697,468 6.49 hrs
Plats.. 0 4.25 hrs
Extens. 0 4.25 hrs
% Cap/�
64.90
42.50
42.50
pate Mo.NAPOT Avg Daily Flows
1/25/2005
2/21/2004
1/18/2004
0/20/2004
9/21/2004
8/20/2004
7/22/2004
3.36
3.85
4.87
4.67
3.36 0.00
3.85 0.00
4,87 0.00
4.67 0.00
<Plan Review>
Moratorium..OK
Moratori
effective since 05/27/1997
Yearly NAPOT (hrs)
Stn Gross Capacity(gpd)
Station Reduction Factor
Stn Net Cap Certif (gpd) .
Stn Net Capacity(gpd)
Indicated Flows(gpd)
4.25
7,488,000
1.00
0
7,488,000
1,326,000
Rgd #
Fig PmP
IC 2
2
2
2
Comments
2
2
Sign Date,.08/30/2000 13:53:19,18
OLD/M Station i<m>provement GOLD/5 <S>tation Inform.. GOLD/U <U>pstream Station
OLD/D <D>ownstream Station GOLD/P <P>ump Information
OLD/T Sewer Cer<t>ification
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5.99 5.99 0.00
4.61 4.61 0.00
3.52 3.52 0.00
Signature..ROQUER
a t}l17'ON
WS,01 4OOl '9l ' dW
k 2 005031610324775 *CAHALP
en
Stat Station Station
R. Type Owner Number
Posed Number of gallons (gpd) : 191750
*'k'******************irk********
DK B21L- 30
kC 30
AC 30
IN 30
IN 30
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0008
CIS
RS
RS95APR
RS 9 4MAR
* Thj
Current
ET (Hrs )
Downstream Stations
6.49
1001.74
1001.73
1001.49
1001.61
is not an official locum
Delta Projected
ET (firs) ET (Ers )
**********rob***********fir******
0.61
0.03
0.02
0.01
0.01.
7.10
1001.78
1001.75
1001,51
1001.62
'd Olt.'ON VNVLS:QI SOE '9I 'JVV