HomeMy WebLinkAboutSite Utility Study•
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THE BLUE AT CORAL WAY
SITE UTILITY STUDY
PREPARED BY:
MARLIN ENGINEERING, INC.
2191 N.W. 971.11. Avenue
Miami, Florida 33172
Tel.: (305) 477-757
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THE BLUE AT CORAL WAY
SITE UTILITY STUDY
1. STORM DRAINAGE
A. Drainage Area
The site is located at 3152 Coral Way some 250 feet east of S.W. 32nd Avenue
abutting S.W 22nd Street (Coral Way) in the north and S.W. 22n` Terrace in the
south. It runs along the south right of way line of Coral Way for approximately
250 feet and approximately 200 feet of frontage on the Southwest 22n`. Road. Its
total area consists of 57,119 square feet or 1.311 acres, according to the
Boundary Survey prepared and updated by Brownell and Associates, dated
5/19/03.
The impervious post -development area is estimated to be 95% to approximately
5% of pervious area remaining. The stoini water discharge will consist primarily
of building roofs, driveways and landscape areas runoff.
The weighted coefficient of run-off will be calculated as:
Impervious Area 0.95 x 0.90 = 0.855
Pervious Area 0.05 x 0.30 = 0.015
Weighted Coefficient Cw = 0.870
B. Existing Drainage System
The municipal roadway drainage system in S.W. 22nd Terrace is maintained by
the City of Miami which is implementing a drainage improvement program
throughout the city limits, after the intense flooding conditions that occurred
during Hurricane Irene and the No -Name Stoini.
The stotni drainage system in S. W. 22nd Street (Coral Way) is maintained by the
State of Florida D.O.T. Although the existing roadway system appears to be of
sufficient capacity to handle the present conditions, it will be studied and
evaluated as part of the civil engineering site development plans, and
improvements recommended should they be required.
C. Proposed Drainage System
Due to the location of this building as well as on the its footprint and lack of green
areas, its primary drainage system of this will consist of drainage wells which will
allow the post -development storm water runoff to be fully contained on -site. No
off -site runoff is anticipated from this building. Based upon the building layout
and area information two drainage wells will be studied which we consider
sufficient to handle the differential runoff (Post -development Q- Pre -development
Q). Preliminary drainage calculations are included below.
The well system will be designed to handle the calculated runoff and sized based
upon the well testing capacity results provide by the well contractor specialist.
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Rainwater will be collected by rain water leaders and piped to catch basin inlets
that will also collect groundwater runoff, and then piped and disposed into
retention tanks that will capture the grease and oils, to achieve the local water
quality standards set by the department of Environmental resources Management
(DERM).
These retention tanks will include within the same structure, the designed deep
well for final disposal. The wells will allow the stoic i water to flow into the
Biscayne Aquifer. The wells will be designed to handle the storm water runoff
and tested for capacity as they are installed.
PRELIMINARY DRAINAGE CALCULATIONS
1. Total area
a. Impervious
b. Pervious
2. Average Runoff Coefficient Cw
3. Design Storm Frequency
4. Time of Concentration
5. Rainfall Intensity
6. Runoff Q = CiA
1.311 Acres
95% or 1.245 Acres
5% or 0.066 Acres
(0.95) + (0.9) + (0.05) (.3) = 0.87
5 years
10.00 min
6.10 in/hr
(0.87) (6.10) (1.311) = 6.96 CFS
Assume each 24" diameter drainage well / flows at 700 GPM/Ft. using 2 feet of
head:
2 x 700 GPM = 1,400 GPM per well
1,400 GPM = 3.12 CFS
Runoff Q 6.96 CFS = 2.23
Cap. Per Well 3.12 CFS
Provide Two (2) — 24" diameter wells
Detention Tank:
Providing 1 V2 Minute detention time of storage in tank.
Volume of tank required handling 1,400 gpm for 1.5 min.
1,400 gpm x 1.5 min = 2,100 Gal/tank or 281 Cu.Ft . each
Provide 2 tanks each with the following interior dimensions:
5'-0" (width) x 5'-0" (height) x 12'-0" (length) = 300 Cu-Ft.
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Provide Two (2) tanks with 300 Cu-Ft. capacities each.
IL WATER DISTRIBUTION SYSTEM
The Miami -Dade Water and Sewer Department WASD owns and operates a 24
inch water main running east -west in front of the property on S.W. 22nd Street
(Coral Way), and two small 2 inch and 4 inch water mains on S.W. 22nd terrace.
The water connections to serve the buildings will be done from the 24-inch main.
Two (2) connections will be installed from said water main one (1) 6-inch fire
protection line and one (1) 6-inch domestic water supply and landscape irrigation
lines. Well water is not permitted at this property.
The calculations for anticipated water volumes required for this project are shown
below.
WATER DEMAND CALCULATION
Residential Apartments
190 units at 200 gpd/unit 38,000
Retail
4,135 Sq-Ft. at 5GPD/100 Sq-Ft. 208
TOTAL WATER DEMAND 38,208 GPD
III. SANITARY SEWER DISPOSAL
The Miami Dade Water and Sewer Department owns and operates a 10 inch
gravity sewer line running east along S.W 22nd Street (Coral Way) and a second
10 inch gravity sanitary sewer line running west along S.W. 22nd Terrace, finally
discharging the sewage into the Sanitary Sewer Pump Station # 152.
An 8 inch sewer lateral will connect the building to the existing sanitary sewer
line on S.W. 22'd terrace. No pump station is needed to provide the anticipated
connection.
The calculations for the anticipated wastewater generated by this project are
shown below.
SEWAGE DISCHARGE
Average Flow (from water Calculations above) 38,208 GPD
Daily Average Flow 26.53 GPD
Daily Peak Flow (26.53x 3.5) 92.86 GPM