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DRAINAGE REPORT
FOR
POUDRE FIRE AUTHORITY
FIRE STATION NO. 2
PREPARED BY
STEWART & ASSOCIATES, INC.
AUGUST 17, 1990
STEWAKr&ASSOCIATES
Consulting Engineers and Surveyors
August 17, 1990
Mr. Glen Schlueter
Storm Drainage Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Glen:
This is the storm drainage report for Fire Station No. 2 located at 415 South
Bryan Avenue, Fort Collins, Colorado. The site contains 0.3148 acres and is situate
in the Canal Importation Basin. The site lies immediately West of the Larimer
County Canal No. 2 and Sheldon Lake. -
The site has an existing fire station which is proposed to have some additional
space added and two parking spaces added. The impervious area will be increased
by 0.03 acres which is a 9.7% increase.
The existing site has offsite storm water from the existing Forestry and Parks
Maintenance Building flowing around the Fire Station No. 2. The offsite flows
and the fire station's runoff flow Easterly to the Bryan Avenue West curb and gutter
and then to the existing inlet just North of the fire station driveway. The area
inlet catches the runoff in the gutter, and then the runoff flows Easterly across
Bryan Avenue in a 12—inch concrete pipe and discharges into the Larimer County
No. 2Canal.
The two—year frequency storm would develop 0.07 c.f.s. more runoff after the
addition is completed, and the ten—year and one hundred —year storms would develop
0.14 c.f.s. and 0.29 c.f.s. more runoff respectfully. The existing site and the
existing neighborhood do not have onsite detention.
Storm water detention will be provided for the 1760 square feet of new
impervious area. The volume required to detain the difference between the two
year historic runoff and the 100 year developed runoff is 270 cubic feet. Detention
of 490 cubic feet will be provided in the Northeast corner of the site by
constructing a berm to detain the runoff. The discharge will be metered by using
a 22 inch diameter outlet pipe through the berm. A spillway will be constructed
in the berm to limit the highwater line to one foot below the existing floor
elevation. The building roof has -a ridge line running East to West, therefore,
the North half of the building will drain to the detention pond.
If you have any questions regarding this request, please call. The runoff
calculations and a copy of the topographic survey are enclosed as a part of this..
report.
Sincerely,
Richard A.
Rutherford, P.E. & L.S.
President
lkk
James H. Stewart
enclosures
214 N.ssociatesHowes Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
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