HomeMy WebLinkAboutPEDERSEN TOYOTA VOLVO SAAB PUD PRELIMINARY AND FINAL - 26 91 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTSTORM DRAINAGE REPORT
FOR
PEDERSEN TOYOTA VOLVO SAAB P.U.D.
PREPARED FOR
GERALD PEDERSEN
PREPARED BY
STEWART & ASSOCIATES. INC.
MAY 3. 1991
LOCATION AND DESCRIPTION OF SITE
The Pedersen Toyota Volvo Saab P.U.D. is located in the Southeast ,
of Section 35, Township 7 North, Range 69 West, of the Sixth P.M. The site
consists of 2.5 net acres on the west side of South College Avenue just north
of Kensington Drive. The site now has bare ground and sparse vegetation.
There is existing development on all 4 sides of the site. College Avenue
is on the east, Kensington Drive is on the south, Target store is on the
north, and there are storage units on the west. The only offsite drainage
onto the site is from 0.1 acre of landscaped area which is part of the storage
units to the west.
The Pedersen Toyota Volvo Saab P.U.D. is located in the Mail Creek
Drainage Basin.
The Pedersen Toyota Volvo Saab P.U.D. is a replat of the Auto Avenue
Mall P.U.D., which was approved by the City in June, 1988.
EXISTING DRAINAGE
The existing site slopes to the northeast and there are some low areas
along the north end of the site. These low areas act as retention ponds,
so at present, there is little runoff from the site.
There is an existing 36 inch storm drain along the west side of South
College Avenue. This pipe drains to Mail Creek, and was constructed by the
South Mason District. The allowable release rate into this pipe was
previously set at 0.5 c.f.s. per acre. Runoff from the pavement on South
College Avenue drains directly into the 36 inch pipe through existing catch
basins. The north half of Kensington Drive drains northeast around the curb
return to the catch basin on South College.
PROPOSED DEVELOPMENT
The site is to be developed as an automotive related business area.
Storm water detention shall be provided in the paved parking lot and runoff
wi-l-l-be-through--ar-ea i-nle.ts---and-a.-pi.pe_sys.tem-whi.ch_wi 11 drai n to the existing
36 inch pipe along the west side of South College Avenue. The release rate
shall be controlled by a restriction plate over the outfall pipe from the
east area inlet.
The entire site drains directly to the detention pond, so there are
no sub -basins.
The attached calculation sheets determine the allowable release rate,
the developed runoff coefficient, the required detention volume, the volume
of the proposed detention pond, and the sizing of the restricted outlet.
The attached map of the site
6E9'
Phillip I. Robinson P.E.L.S.
shows �tJhe1;pr1op,4sed grading and drainage.
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TOMPUTATIONS
Stewart & Associates, Inc. 214 N: Howes St.. Ft. Collins, CO 80521 (303) 482-9331
By:Date s/ Client: Cr. periprseL Dg-,rs LaCk-IOP2 Sheet No. 3 of
Chkd By: Date Project: Se-JerSen ToV e l-a- l/ool ve - Soto-b
Subject (! +Om zoSi�e DeveIoocj C gfng! Ponj ✓olvMC I'rovldee(
COMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St... Ft. Collins, CO 80521 (303) 482-9331
By: nlTZ Date Client: Client:G• Pad-erten- DanaLockwo.l Sheet No. of
ChkdBy: (Date Project: FrJerSen Fovo�-o- delve- Saab
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