HomeMy WebLinkAboutSite Utility Study•
MIXED -USE PROJECT
3760 BIRD ROAD
SITE UTILITY STUDY
Prepared for:
H & H Development, Inc.
Prepared by:
Consulting Engineering and Science, Inc.
October 28, 2005
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1. General
A. Project Location and Size:
The project is located along the south side of Bird Road (S.W.
40th Street); bounded on the west by S.W. 38th Avenue; on the
south by Peacock Avenue and on the east by S.W. 37th Court in
the City of Miami. The site, with an area of 76,083 square
feet, or 1.75 acres, has approximately 277 feet of frontage
along Bird Road (S.W. 40th Street), approximately 268 feet of
frontage along S.W. 38th Avenue, approximately 277 feet of
frontage along S.W. 37th Court and approximately 278 feet of
frontage along Peacock Avenue.
The site is currently occupied by a single story car
dealership with at -grade parking.
B. The proposed project build -out will be as follows:
Condominiums:
Office:
Retail:
Site Area :
254 units
67,800 sf
19,600 sf
76,083 sf, or 1.75 acres
Construction will be a mixed use multi -story building
including residential, office and retail uses with interior
parking. Access will be from, S.W. 38th Avenue, Peacock
Avenue and S.W. 37th Court.
2. Drainage
A. Drainage Area
Upon development, 90 percent of the site will be impervious
and 10 percent of the site will be pervious. Stormwater
runoff will consist of rainfall from the building roof, decks,
landscape areas and one-third of the vertical building
surface.
B. Existing Storm Drainage System:
Runoff from the site is currently directed to a number of
catch basins located throughout the existing parking areas
from which the runoff is directed to underground seepage
trenches/exfiltration trenches.
C. Proposed Storm Drainage System:
The storm drainage system to serve this project will be
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designed to contain the 5-year 1-day storm event and the 25-
year 3-day storm event on -site, and will be designed to
protect the first floor elevations from the 100-year 3-day
storm event, as required to comply with the applicable
requirements of the Miami -Dade County Department of
Environmental Resources Management (DERM) and the South
Florida Water Management District (SrWMD). It is anticipated
that the stormwater disposal system will include two (2) 24-
inch drainage wells. See supporting calculations in 'Table 1.
Runoff will be collected through a system of catch basins and
conveyed by pipes to the well locations,
Runoff from driving surfaces such as driveways and parking
areas will be diverted through baffled pollution control
structures which will capture the oils and greases prior to
flowing into the wells.
Table 1
Preliminary Drainage Calculations
1. Total Site Area
a. Impervious Area
Roof/Decks/Walks
1/3 Vert. Bldg. Surface
1.75 Acres
1.57 Acres
0.86 Acres
2.43 Acres
b. Pervious Area 0.18 Acres
c. Adjusted Contributing Area 2.61 Acres
2. Average Runoff Coefficient 2.43(0.9) 0.18(0.2)
2.61
= 0,85
3. Design Storm; 5 years
4. Time of Concentration 15 minutes
5. Rainfall Intensity 5.50 in/hr
6. Peak Runoff (Q) = CiA (0.85)(5.50)(2.61)
12.20 cfs
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Assume each 24-µinch diameter drainage well has a capacity of
750 gpm per foot of head; and, 4.00 feet of available head:
Well. Capacity = 750 gpm x 4.00 feet = 3,000 gpm per well
6.68 cfs per well
No. Wells = Peak Runoff w 12.20 cfs = 1.83 wells
Well Capacity 6.68 cfs
Provide two (2) - 24-inch diameter Drainage Wells
Detention Tank: Provide 1.5 minutes (90 seconds) of detention
time of storage in tank for surface area only (excludes 1/3 of
the vertical building surfaces):
Q _ (0.85)(5.50)(1.75) = 8.18 cfs
Volume of tank required to handle 8.18 cfs for 90 seconds:
V = 8.18 cfs x 90 sec = 736 cubic feet (cf)
Provide two (2) tanks with the following interior dimensions:
V = (2)[6'-6" (width) x 12' (length) x 5' (depth)] = 780 cf
3. Water Distribution
The Miami -Dade Water and Sewer Department (WASD) owns and
operates a 48-inch, a 42-inch, a 12-inch and an 8-inch water
main located in Bird Road (S.W. 40th Street); a 12-inch and a
4-inch water main located in S.W. 37th Court; a 12-inch water
main located in Peacock Avenue; and, a 6-inch main located in
S.W. 38th Avenue.
WASD has indicated that no off -site water main extensions will
be required to serve this project. They have further
indicated that the water and fire connections for this project
are to be made from the existing 12-inch water main located in
S.W. 37th Court or the existing 12-inch water main located in
Peacock Avenue. The connections will consist of a fire line
service, domestic water service and cooling tower/irrigation
water service. No on -site water wells are planned for this
project.
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The calculations for anticipated water usage required for this
project are shown below in Table 2.
Table 2
Water Usage
Residential Condominiums:
254 units @ 200 gpd/unit
Office:
67,800 sf @ 10 gpd/100 sf
Retail:
19,600 sf @ 5 gpd/100 sf
Total
50,800 gpd
6,780 gpd
980 gpd
58,560 gpd
4. Sanitary Sewer
The Miami -Dade Water and Sewer Department (WASD) owns and
operates 10-inch gravity sewer mains located in S.W. 38th
Avenue and in Peacock Avenue; and, a 36-inch gravity sewer
main located in S.W. 37th Court. WASD has indicated that no
off -site sewer main extensions will be required to serve this
project. They have further indicated that gravity sewer
connections to the 10-inch gravity sewer main located in S.W.
38th Avenue and/or the 10-inch gravity sewer main located in
Peacock Avenue will be made to serve this project. An on -site
pump station will not be required to serve the project.
Anticipated sewage flow calculations are shown below, in Table
3.
Table 3
Sewage Flow Calculations
Average Daily Flow (Table 2)
Average Daily Flow
Peak Flow (ADF x 2.0)
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58,560 gpd
41 gpm
82 gpm
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5. Solid Waste Generation
Solid waste generated by this project will be collected in
standardized on -site containers for refuse and recyclable
waste. Regular service will be provided by either private
hauling companies and/or the City of Miami or Miami -Dade
County Department of Solid Waste. Both will transport the
waste to Miami -Dade County's disposal or recycling facilities.
The projected daily volumes of solid waste generation are
shown below, in Table 4.
Table 4
Solid Waste Generation
Residential Condominiums:
Solid Waste - 254 units x 1.42 tons/unit/year
361 tons/year
0.99 tons/day
1,980 lbs/day
Office:
Solid Waste
Retail:
Solid Waste
67,800 sf @ 3.08 lbs/sf/year
208,824 lbs/year
572 lbs/day
19,600 sf @ 3.08 lbs/sf/year
60,368 lbs/year
165 lbs/day
Total - 2,717 lbs/day
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