HomeMy WebLinkAboutArticle III. Tab 4 Site Utility Study•
September 2006
Columbus Centre
MAJOR USE SPECIAL PERMIT
SITE UTILITY STUDY
PREPARED FOR
1450 South Miami, LLC
KHA Project No.: 043061000
Prepared by:
KIMLEY-HORN AND ASSOCIATES, INC.
1691 MICHIGAN AVENUE, SUITE 400
MIAMI BEACH, FL 33139
cowl Kimley-Horn
® ... and Associates; Inc,
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September 2006
Colu us Centre
MAJOR USE SPECIAL PFRMIT
SITE UTILITY STUDY
PREPARED FOR
1450 South Miami, LLC
KHA Project No.: 043061000
Prepared by:
KIMLEY-HORN AND ASSOCIATES, INC.
1691 MICHIGAN AVENUE, SUITE 400
MIAMI BEACH. FL 33139
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Site: Unity Study
1ntroduct u
'.l'he Columbus Centre is a proposed 56-story multi -family, high density residential tower to be located
on approximately _902 acre at the NW corner of South Miami Avenue and S.W. 15t Road, in the City
of Miami, Florida (see Site Location Map -Fig 1). The Columbus Centre is to include one (1) tower
with a common upper -level amenity -deck and ground -floor streetscape and a 596 space parking
garage. Table 1 below, depicts the details of the proposed project.
Table 1
Project Summary
Condo
30-56
219
312,540
Hotel
19-27
234
180,689
Offices
1-18
209,376
Retail
8,584
Parking (Gross
LL 1, LL2, 2 to 11
596 spaces
I. Drainage
Existing Drainage System
The survey of existing conditions provided by Biscayne Engineering Company, L.L.C. shows
an existing drainage system located on the north east portion of the site, within parcel "A."
This system may not be adequately designed to treat and retain the additional flows from the
other portions of the site. Therefore, a new stormwater management system will be
constructed to retain the runoff generated by the proposed development.
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Figure 1:
Site Location Map
Proposed Drainage System
The drainage system for the proposed development will consist of drainage wells and
exfiltration trenches to facilitate on -site disposal of storm water runoff. The 5-year, 24-
hour design storm event will be used to design the stoat': water management system, in
accordance with Section D-4, "Water Control", of Part 2 of the Miami -Dade County
Public Works Manual. No direct or indirect drainage connections or discharge of storm
runoff frorn the property to adjacent properties or rights -of -way will be permitted.
Based on preliminary calculations, it is anticipated that two (2) 24" drainage wells will
provide sufficient capacity to dispose of the design 5-year 24-hour storm water runoff
Columbus Centre
Site Utility Study
Page 3
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generated by the proposed development. Preliminary drainage computations for the
project areas are provided in Attachment ''B„ Preliminary Drainage Well Calculations,
which includes We 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.
Flood Criteria:
The proposed project site grade elevations will be designed to meet floodplain management
criteria according to Federal, State, Miami -Dade County and City of Miami standards as follows:
1. The subject property is located in PANEL 191 of COMMUNITY -PANEL NUMBER
12025C0191 J of the Flood Insurance Rate Map (FIRM). According to the National Flood
Insurance Program, the property is located within Flood Zone X, areas determined to be
outside of the 500 year flood plain.
2. Miami -Dade County Flood Criteria elevation is estimated to be 5.0 ft. NGVD. This will be
used to determine proposed minimum site grade elevations.
3. The average October ground water table elevation is estimated to be 2.0 ft. NGVD. This will
be used as the control water elevation for stormwater management calculations (Source:
Miami -Dade County Public Works Manual, Volume II - Design Standard Detail WC 2-2).
IL 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 below.
Columbus Centre
Site Utility Study
Page 4
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Table 3
Existing Water Mains
. oeation .
Between
--�
��'ater°
Main(s)
S W. 14th Terrace
S.W. Ise Ave. and S Miami Ave.
8"
S. Miami Avenue
S.W. 14t Terrace and S.W. 15th Road
" 16"
S.W. I5th Road
S.W. 1s` Ave. and S Miami Ave.
12"
S.W. 15S Court
S.W. 15th Rd. and S.W. 14t Terrace
12"
Per the MDWASD water atlas sheet (F-15) provided by MDWASD, a 6-inch and 16-inch water main
fronts the property along S. Miami Avenue, an 8-inch water main is located along S.W. 14th Terrace
between S.W. IS` Avenue and S. Miami Ave, a 12-inch water main is located on S.W. 15`s Road
between S.W. 15` Avenue and S. Miami Avenue, and a 12 inch water main located on S.W. 1st Court
between S.W. 15th Rd. and S.W. 1e Terrace. In addition, MDWASD may request additional fire
hydrants be placed in the vicinities of the subject project. A final determination of the points of
connection and requirements will not be provided by MDWASD until a Water and Sewer Agreement
is requested by the owner. Water service meters would need to be purchased by the owner and
installed by MDWASD officials. See Attachment "B" 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 the Miami -Dade Water and Sewer
Department within the vicinity of the project.
Columbus Centre
Site Utility Study
Page 5
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Table 4
Existing Sanitary Sewer Mains
Location
13ety♦°een.. Sanitary Sewer lYlaxn(s)
5. . 15''' Road
S.W. I' Ave. and S .Nliarni Ave.
I 102" Force Main
S.W. 14th Terrace
S.W. 1'i Ct. and S. Miami Ave.
8" Gravity
S.W. i5F Court
S.W. .15 Rd. and S.W. 1.4`
Terrace
8" Gravity
S. Miami Ave.
S.W. 15`i' Rd. and S.W. 14`h
Terrace
8" Gravity
Any of the existing 8-inch gravity sanitary sewer mains adjacent to the proposed development may
have sufficient capacity to accommodate the proposed development. However, this can not be verified
until a downstream analysis of the existing 8-inch gravity lines are completed. 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
existing 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 could not be attained because of the size of the
force main on S.W. 15'r road is larger than 12". A official letter request to the MDWASD must be
made and approval from the Department of Homeland Security must be obtained prior to obtaining
this information.
MDWASD Pump Station #30-0008 receives the flows from these mains. As of 07/25/06, this
pump station is operating at an average yearly NAPOT of 5.58 hours which is 55.8% of its
design capacity. Therefore, a new sanitary sewer pump station or upgrades to said pump
station may not be required for the proposed development. A final determination 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.
Please refer to Attachment "C" for Pump Station Monthly Information.
Columbus Centre
Site Utility Study
Page b
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Table 5
Water & Sewer Flow Generation
Multiple Family
Residential
219 units 200 GPD per unit
43,800
Hotel
234 rooms
100 GPD per room
23,400
Oflice/Retail 173,581 sf
10 GPD/100 sf
17358
Total Anticipated Flow
84,558
IV. Solid Waste Generation
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
Type, of
Occupancy
Total Solid Waste
Generated
(Tuns/13ay)
Multiple Family
Residential
219 units
5.31 lbs/unit/day
0.581
Hotel
234 rooms
2 lb/roonn/day
0.234
Office/Retail
173,581 sf
101bs/1000 sf/day
0.868
Total Anticipated Flow 1.683
Columbus Centre
Site Utility Study
Page 7
110
Attachment A
Preliminary Drainage Well Calculations
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110 r� CALCULATIONS: i�RALNAG�, CA�.G
DRAINAGE WELLS
(MASS DIAGRAM_._ .D.LR!vI CRITERIA)
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Columbus Centre
City of . Iis mi, Florida
1. Site Data:
A. Average Control Water Elevation (NGVD)
13. County Hood Criteria Elevation (NGVD)
C. F.I.R.M. Base Flood Elevation (NGVD)
D. Lowest proposed inlet elevation (NGVD)
2. Total Property Area :
A. Impervious Areas:
a) Asphalt and concrete pavetne
b) Roof areas ..-
Total Impervious Area (A.)
13. Pervious areas:
a) Green Areas
C. Total Contributing Area ._
3. Weighted Runoff Coefficient (C):
(M-DCPW :Manual Part 2 - Section t)-sr, Design
2.00 Standard WC 2.2)
5.00 (Per County Hood ;riteria Map, see Ap.. D)
N/A (Zone X, Map No. I2025C0191 2, sec Apx. D)
14.00
0.903 Acres
0.850 Acres
0.000 Acres
0.850 Acres
0.051 Acres
0.901 Acres
Runoff Coefficient Impervious (C1) - 0.90
Runoff Coefficient Pervious (C2) 0.30
C - [(Al x C 1) + (A2 x C2)] / A; C - 0.866
C x A Total Contributing Area; C x A 0.78 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-° t t) + t (0.5895 + F-2'3)]
Frequency (F) - 5 years - Frequency Curve
Q = CIA, V = Qt; Vo in: - Qttt ;"), tf- 3 1- Time to generate 1 inch of runoff
V(t laj - C1Attt i L)
I" x A = ClAttt in.) ; Solving for to in.), to i„.) - 1" / (IC)
Time to Generate one inch of run-off t(in)
Time to reach the inlet (Ie.)
Total Time required to Generate 1 in of runoff:
- 11.56 Min.
- 8.00 Min.
- 19.56 Min.
O-WELLS-Coumbus Centre.xts _ B?.SN
. (:),trtt€mia0ve Rum )1' fin l(i , `.lass Diagram,)
Min.)
10
15
19.56
()
50
60
90
120
180
(See
480
600
900
1174
1800
2400
3000
3600
5400
7200
0800
CxA
(acres)
80
0.780
0.780
0.780
0.780
0.780
0.780
0.780
0.780
0. 780
0.780
(inches)
)5
6.166
5641
5.235
4.493
3.9'16
3.534
3.193
2.477
2.023
1.480
lccumulated
Storm
Q Runoff
CFS
5.00
4.81 2.887
4.40 3,961
4.08 4,793
3.51 6,310
.09 7,408
2.76 8,272
2.49 8,970
1.93 10,436
1.58 11,364
1.16 12,475
6. Drainag
Well Design Discharge Rate:
Based on well discharge rate of
425 GPM/ft. Hard
Well
No.
Lowest Inlet
Rim Elev.
(NGV➢)
Oct. Water
Table elev.
(NGVD)
Free Board
(ft)
Headloss due
to Higher SG.
of Salt Water
(ft.)
Head Acting on
Well (t.)
Well Discharge
Rate (CFS)
Well Structure Dimensions
Well Structure
Storage Volume
(CF)
Width (ft.)
Length (ft.)
DW-1
14.00
2.00
3.50
2,20
6.30
5.97
6.0
8.0
302.4
302.4
DW-2
14.00
2.00
3.50
2.20
6.30
5.97
6.0
8.0
Well Discharge Rate (CFS)
11.93
Total Storage (CF)
604.80
7. Detention Time:
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.
Vdz = Detention Volume Per Well (CE)77
W - Width of Well Structure (1'0-=
1, = Length of Well Structure (fl.) =
4.08 CFS
367.58 CF
122.53 CI'
6.0 ft,
8.0 ft.
1-1,n;,, is the minimum depth required from the top of well casing to the floor of the well box to achieve 90 second detention time:
Ilm,,, (ft.) = Vdl (( W x L) = 2.60 ft.=Depth from top of casing to bottom of well box
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38. _,> t• sF :store
f xelucl no Nell structure
liar.
8
11)
15
9.56
30
40
50
60
90
120
180
(Sec.)
480
600
900
1.173.53
1801)
2400
3006
3600
5400
7200
10800
Well
Discharge
Rate
((TS.)
11.93
11.93
1 1_ 93
11.93
1 1.93
11.93
11.93
11.93
11.93
11.93
11.93
umtaiaDe(
Well
1Jiseltarge
Volume
(CF)
5,.727
7,159
10.739
14,1102
21,477
28.636
35,795
42,955
64,432
85,909
128,864
Accumulated
Storm Runof
(CF)
2,399
2.887
3.961
4,793
6,310
7,408
8,272
8,970
10.436
1 1,364
12.475
Total Overflow
Volume
(CF)
-3.329
-4.272
-13,777
-9,209
-I5,167
-21.228
-27.52 3
-33.985
-53,996
-74,545
-116,389
9. Excess storm water runoff including well structure storage:
Time
Accumulated
Storm Runoff
(CF)
Storage in
Well Structure
(CF)
Accumulated
Well
Disehaxge
Volume
(CF)
Total Overflow
Volume
(CF)
(Mina.)
(Sec.)
8
480
2,399
605
5,727
-3.933.45
10
600
2,887
605
7,159
-4,877.26
15
900
3,961
605
10,739
-7,382.25
19.56
1,173.53
4,793
605
14,002
-9,814.29
30
1800
6,310
605
21,477
-15,771.93
40
2400
7,408
605
28,636
-21,832.73
50
3000
8.272
605
35,795
-28,127.94
60
3600
8,970
605
42,955
-34,589.75
90
5400
10,436
605
64,432
-54,600.96
120
7200
11,364
605
85,909
-75,149.49
180
10800
12,475
605
128,864
-116,993.83
Saf'et'.I)at°tur 2.92
Safety Factor
3.05
Attachment B
MDWASD Water Atlas
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Attachment C
Pump Station Monthly Information
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Addt€x
Secni
ation. 36-0008 Atlas Pane:
ee wAtea >ewre e nar.;am errr
tii',9961666L149E
}Aaeataasum in elleci airy. 15; 277+, 932
3svnxhipflan '.. . lyu . IF 5enerhtfsx dlv Teleme9y ET dock F.,
3Funitaer of 6amps_ 2
Yeady5APOT (tusl: 2.93
Res flaw[gpol 927,453
Pral0apot: 5.5(1 hrs
X Cap: 55.0
Sin Gvoss Capac1fylgF l.4aa: 54
Station F9edueainn Facing 1
1 Sin Net Cap Ceetil(slx6J
Sin KM Capacikyl. 7.483A50
lIndicatedFtaws 914.199
7725?25 6 2.36 -2.3S
6i23e2305 237 2.37 •' 2
4i24RS 2.93 2.93 Y 2
4/ 5/2DOS .2.444 2.49 r _.. 2
427/2 0S 1.63 1.63 Y 2
f26 2JOS 0.07 0D1 '.Y 2
Date:
81u_fAPOT Avg Daily: Mg Flg: 11 Pump: Comments:
s,rlr00s j aoa ITT
Save
11 eturn to Re.stdta 1.
6R011SR
...............
BRODSR
BRUSH
9ROCSR
6RODSR
9ROPSR
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Attachment
aps
1691 Michigan Avenue, Suite 400
Miami Beach, Florida 33139
Kim ley -Han and Anocklesr IncPhone: 305-673-2025
•�� Fax: 305-673-4882
COLUMBUS CENTRE
1492 SOUTH MIAMI AVE.
LOCATION MAP
City of
Miami
'-,120 ' 50
4O
1111.
Kimley-Horn and Associates, Inc.
PO 111141RAPOI se mown gm
1691 Michigan Avenue, Suite 400
Miami Beach, FCorida 33139
Phone: 305-673-2025
Fax: 305-673--4882
COLUMBUS CENTRE
1492 SOUTH MIAMI AVE.
ARM MAP
1691 Michigan Avenue, Suite 400
Miami Beach, Florida 33139
Kimley-Hom aid Assocides,IntPhone: 305--673-2025
ipema• Fax: 305-673-4882
COLUMBUS CENTRE
FLOOD CRITERIA MAP
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4.
1
3 4
Pa
24,5
2-2
v!
G ;502
; 781
0
CA
G 855
;342
COCC;r
1691 Michigan Avenue, Suite 400
Miami Beach, Florida 33139
Kimley-HOM Aniggkink Ing Phone: 305-673-2025
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mom" Fax: 305-673-4882
atb
4
<75
0
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t.FGE ND
.555.1.11 -2--- iiINEO
(ESTIMATED)
NOTES.
CONTOUR iNTER/AL 1.0 FOOT
(Elvin"? as indicated)
M MEAN SEA LEVEL.
COLUMBUS CENTRE
AVERAGE OCTOBER GROUND
WATER LEVEL 1960-75