HomeMy WebLinkAboutDrainage Reports - 04/08/1987STEWART$,AssoCIATES
Consulting Engineers and Surveyors
April 8, 1987
Ms. Susan Hayes
Storm Drainage Department
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
FINAL DRAINAGE REPORT
OAK RIDGE BUSINESS PARK, 7TH FILING
Oak Ridge Business Park, 7th Filing P.U.D. is a 5.2 acre site situate East
of McMurray Avenue and South of proposed Oak Ridge Drive. It is.the Northwest
corner of a proposed 15.3 acre block. The Seventh Filing is a portion of the
overall Oak Ridge Business Park situate in Section 6, Township 6 North, Range
68 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. A map showing
the total project is shown on page 5 of this report.
The current on —site detention requirements are calculated using a fixed
release rate of 0.20 c.f.s. per acre as determined by the drainage report by RBD
Engineering. Sheet two of this report shows the mass diagram with the required
detention calculated to be 50,544 cubic feet with a total release rate of 1.04
c.f.s.
The storm runoff will be detained in the parking lots as shown on sheet 7
of the utility plans. The area of runoff into each area inlet is: Area "A" _
1.0 acre, Area "B" = 1.3 acres, Area's "C" & " V = 0.6 acres, and Area "F" = 1.7
acres. The release rate into each area inlet will be controlled by a restriction
plate under the top of the inlet and is detailed on sheet 8 of the utility plans.
Page 3 of this report shows the calculations for the sizing of the orfice, and
a sizing table is shown with the detail on sheet 8.
The calculated detention for each area is shown on page 4 of this report.
The total detention is 54,690 cubic feet more or less which is more than the
required detention of 50,544 cubic feet.
James H. Stewart
and Associates, Inc.
214 N. Howes Street
P.O. Box 429
Ft. Collins, CO 80522
3031482.9331
Franklin D. Blake, P.E. & L.S.
COMPUTATIONS
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