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STORM DRAINAGE REPORT
AUTO AVENUE MALL
The Auto Avenue Mall development is a 3—acre site located at the northwest
corner of South College Avenue and Kensington Drive. The site is to
be developed as an automotive related business area. The composite C
value is 0.85, allowable run—off is 0.5 c.f.s. per acre, or 1.5 c.f.s.,
and the required detention is 22,680 cubic feet.
We propose to detain in the parking lots with drainage into area inlets.
The area inlets will drain into the existing 36" storm drain running
south along the west line of South College Avenue.
The drainage will be carried through the site in 12" pipes, and then
the allowable outflow into the 36" pipe will be controlled by a 20 square
inch opening in an orfice plate. The outflow will be carried from the
inlet box to the existing 36" pipe in 30 feet of 15" RCP.
There will be no off —site run—off from the Target store to the north
or from South College Avenue to the east. The storage units to the west
may contribute a small amount of run—off from 0.1 acre of landscaped
area. We plan to take the drainage from the north z of Kensington Drive
from Mason to the entrance, a distance of 200 feet and an area of 0.12
acres. This water presently runs east to a catch basin at the beginning
of the radius at College Avenue. The catch basin and radius must be
removed to widen College Avenue, so we propose to pick up most of the
water through the site. Then we can eliminate the need for a pan across
the entrance.
A catch basin will be constructed along the new curb on College Avenue.
This new catch basin will pick up water from College and from the east
150 feet of the north 112 of Kensington Drive.
Calculations of the quantities and sizes in this report are shown on
the attached sheets, and the site and drainage patterns and quantities
are shown on the attached map.
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