HomeMy WebLinkAboutSATURN OF FORT COLLINS PUD AMENDED FINAL - 34 90 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTDRAINAGE REPORT
FOR
SATURN OF FORT COLLINS P.U.D
STEWART & ASSOCIATES. INC.
JULY 6. 1990
S ART&ASSOC ATE?
Consulting Engineers,and Surveyors
July 9, 1990
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P 0 Box 580
Fort Collins, CO 80522
Dear Glen:
This is the storm drainage report. for Saturn of Fort Collins P.U.D. The site is
for a proposed automobile dealership at the Southeast corner of South College Avenue
and Foothills Parkway. The site contains 0.713 acres and is zoned Highway Business.
The building was previously occupied by Commercial Federal Savings and Loan.
The site is located in the Foothills Drainage Basin. It was included in the Storm
Drainage Study for the Foothills Fashion Mall Expansion prepared by Stewart and
Associates, Inc. dated July 20, 1987. The Saturn of Fort Collins P.U.D. was a part
of Area 12 and a part of Area 16 of the Fashion Mall Study.
The proposed P.U.D. has only minor changes to the site plan as related to storm
drainage runoff quantities. Approximately 1000 square feet of asphalt paving is
being added on the. West side of the building. Also, approximately 1200 square feet
of turfstone. is being added for automobile display on the East side of the building.
The runoff coefficient for the existing site is 0.66 and the runoff coefficient
for the.proposed P.U.D. increases to 0.70. The impervious area increases by M%
and the turfstone area is 3A%.
In the Foothills Mall Expansion study Areas 12 and 16 used a runoff coefficient
of 1.0 and 0.95 respectfully to determine runoff. The North '; of the proposed P.U.D.
is located in Area 12 and its runoff flows to an existing inlet in the South curb
of Foothills Parkway. The South ; of the proposed P.U.D. is located in Area 16
and its runoff flows to an existing inlet at the Northerly most corner of the Sears
front parking lot.
Since the calculations for Areas 12 and 16 were made using the H.B. zoning
coefficient of runoff and the actual coefficient for the existing site and proposed
site are significantly less, we are. requesting that no onsite detention be required.
Likewise we are requesting that no basin fees be assessed. The Fashion Mall storm
drainage system was determined i'n the Expansion study to be able to handle therunoff
from Areas 12 and 16 and thatrunoff will not be exceeded by this proposal.
The runoff calculations and the site plan and the Drainage Plan for the Foothills
Fashion Mall are included as a part of this report.
If you have any questions regarding the report or the requests for no onsite
detention or basin fees, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
President .lames H. Stewart
and Associates, Inc.
214 N. Howes Street
1 kk P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
5028
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---- - -- PROJECT NO. ------
AREA OC SrrE D•7i3 Ac.. Z oN�NG = N, f3
IMpep,vl0U1 AjeEA = 0,4.07Ac.• 57.1%
E X.'S riN�
PeevtovJ A J2EA = 0.30/oA 4Z.9
EX�sr,n,G C = CO•57/ j + (0.429 x 0.2)
e
ZMp62vtovJ �2Eq D,•430 L0.3%
oposEt� TVleFSTOVe Aer.A o.OZ$ 3.9°/
0
PLC ,2 v�OJ7 A P EA 0, 2 SS 3S• t
PRoPOSFI O G = (0.to03 x /� 1(6,039x 0.S) {- (6•3S$ x 0,Z) - 0,70
U S I Al . mac. = /0 M i N,
ppop, Q zy� = 0.70 X Z•Sx 0,713 c•F1;
1oyp- = 0,70 x 4,4-x 0,713 - Z,ao c•rJ
Q IOU yR, = /. ZS X 0,70 X 7 x 0,713 - 4-37 c., F.S ,
SOUTH COLLEGE AVENUE'
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SA TURN OF FORT COLLINS R. U. D.
DRA/IVAGE PLAN
STEWART AND ASS AWES
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