HomeMy WebLinkAboutSite Utility StudyPARK PLACE II
MAJOR USE SPECIAL PERMIT
SITE UTILITY STUDY
Prepared for:
Rilea Group
Prepared by:
Bermello, Ajamil & Partners
February 1, 2005
• PARK PLACE II
. SITE UTILITY STUDY
1. DRAINAGE
A. Drainage Area
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The site is located west and adjacent to Brickell Avenue, east of the alley
between South Miami Avenue and Brickell Avenue, and on the north side of SE
15th Road. It consists on one parcel of approximately 2.46 acres.
After development, approximately 95% of the site will be impervious areas and
approximately 5% of the site will remain as pervious areas. The storm water
discharge will consist primarily of building roofs, driveways and landscape areas
run-off. The coefficient of run-off is arrived at as follows:
0.95 (impervious) x 0.90
+0.05 (pervious) x 0.30
overall coefficient
B. Existing Drainage System
0.855
0.015
0.87
The City of Miami and the FDOT presently maintain a roadway drainage system
in all three streets surrounding the area. The site is presently fully developed.
The existing roadway system there, appears to be of sufficient capacity to handle
the present conditions.
C. Proposed Drainage System
The primary drainage system of this building will consist of drainage wells which
will allow the stormwater runoff to be fully contained on -site. No off -site runoff is
expected from this building. It is anticipated that four drainage wells will be
sufficient to handle the runoff (See Table 1 for drainage calculations).
The stormwater will be collected thru a system of catch basin inlets and
transported by pipes to the well locations. The wells will allow the stormwater to
flow into the Biscayne Aquifer. The wells will be designed to handle the
stormwater runoff and tested for capacity as they are installed.
Runoff from driving surfaces such as driveways and parking areas will be
diverted thru detention structures which will capture the oils and greases prior to
flowing into the wells.
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Table 1
Sample Drainage Calculations
(Phase 2 only)
Runoff Generations
1. Total Area
a. Impervious
b. Pervious
2. Average Runoff Coefficient
3. Design Storm
4. Time of Concentration
5. Rainfall Intensity
6. Peak Runoff (Q) - C,A
2.46 Acres
95% or 0.95 Acres
5% or 0.05 Acres
(.95) (.9) + (.05) (.3) = 0.87
5 years
10.00 min
6.10 in/hr
(.87) (6.10) (2.46) = 13.06 CFS
Assume each 24" diameter drainage well flows at 750 gpm per foot of head
using 2 feet of head:
2 x 750 gpm = 1,500 gpm per welt
1,500 gpm = 3.34 CFS
(Peak runoff)
(Flow per well)
13.06 CFS
3.34 CFS
Provide 4 - 24" diameter wells
Detention Tank:
Providing 1 % minute detention time of storage in tank.
= 3.90 Wells
Volume of tank required to handle 1,500 gpm for 1.5 min.
1,500 gpm x 1.5 min = 2,250 gal/tank or 300 ft3 each
Provide 4 tanks, each one with the following interior dimensions:
5' (width) x 5' (height) x 12' (length) = 300 ft3
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Provide 4 tanks with 300 ft3 volume each
II. WATER DISTRIBUTION
The Miami -Dade Water and Sewer Department owns and operates one 12" Water Main
located on SE 15th Road. The water connections to serve the buildings will be done
from the existing 12" water line. The connections will consist of fire protection line,
domestic water supply system and irrigation water. No on -site wells are planned for this
project.
The calculations for anticipated water volumes required for this project are shown
below, in Table 2.
Table 2
Water Volumes
Office Area
524,300 sf @ 10gpd/100 sf 52,430 gpd
III. SANITARY SEWER
The Miami Dade Water and Sewer Department owns and operates a 10" gravity sewer
system running along the alley bordering Park Place Phase I and by the east side of the
subject property. It is anticipated that multiple gravity sewer laterals connecting to this
existing 10" gravity sewer main will be sufficient to serve this project. No pump station
will be built on -site to serve the project. Table 3, below, shows the anticipated sewage
flow calculations.
Table 3
Sewage Flows
Average Flow (from Table 2) 52,430 gpd
Average Flow 36.40 gpm
Peak Flow (36 x 3.5) 126 gpm
IV. SOLID WASTE GENERATION
Solid waste generated by this project will be collected in standardized on -site containers
for refuse and recyclables. Regular pick-up service will be provided by either private
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hauling companies and/or The City of Miami Solid Waste Department, which will
transport the waste to Metro -Dade County's Disposal or Recycling facilities. The
estimated daily volume of solid waste generated is shown in Table 4, below.
Table 4
Solid Waste Generation
Office Building
524,300 sf @ 6 ppd/1000 sf 3,146 Ibs
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