HomeMy WebLinkAboutTHE DETAIL CENTER PUD - PRELIMINARY & FINAL - 22-94 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTCOMPUTATIONS
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
March 31, 1994
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Basil:
This is regarding the storm drainage for The Detail Center that is proposed
on the southeast corner of Swallow Road and McClelland Drive. The site is
a part of Lot 3, Swallow Subdivision, that was developed in 1984. There were
three building sites proposed at that time. Parcel "A" and Parcel "B" were
completed in 1984. Both parcels have two office buildings. Parcel "C" was
not built on in 1984. The entire Lot 3 was to have a common parking area and
a common storm water detention pond. The detention pond was built in the
portion of the lot that has been completed. The discharge pipe and concrete
pan have been in operation since 1984.
The required volume was calculated using a mass diagram, and it was 9,972
cubic feet. The allowable release rate was 0.42 cubic feet per second, and
the discharge pipe was a four —inch P.U.C. pipe through a headwall. The "C"
coefficient of imperviousness that was used was 0.95.
The upper 35 lineal feet of the detention pond will be on The Detail
Center's east end of their portion of the parking lot. I do not believe that
"As Built" surveys were required in 1984. We can do an "As Built" survey of
the pond prior to the issuance of a building permit or at whatever time the
City desires to insure that the required detention is available.
The site at this time has a good cover of weeds and grass; however, most
of the site will be disturbed. The building foundation will be started as
the first part of construction. The asphalt will probably not be completed
within six weeks. A silt fence will be placed along the east property line
to protect the existing asphalt parking lot.
The grading plan for the site and the storm water calculations from 1984
are enclosed as a part of this report. If you need further information for
this project, please call.
Sincerely,
Qt G.
Richard A. Rutherford, E. & L. S.
President
jrr
enclosures James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins. CO 80522
303/482-9331
Fax 303/482-9382
STORM DRAINAGE REPORT
FOR
THE DETAIL CENTER
MARCH 31, 1994
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331