HomeMy WebLinkAboutGATEWAY AT HARMONY ROAD PUD, 1ST FILING - FINAL - 1-88C - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFINAL DRAINAGE REPORT
THE GATEWAY TO HARMONY ROAD P.U.D.
PREPARED BY
STEWART & ASSOCIATES, INC.
FEBRUARY 8, 1989
FINAL DRAINAGE REPORT
THE GATEWAY TO HARMONY ROAD P.U.D.
SITE LOCATION: The site, originally known as Harmony P.U.D., is now
The Gateway at Harmony Road, P.U.D. The site is located at the Northwest
corner of the intersection of South College Avenue and West Harmony Road.
The site is bordered on the North by Kensington Drive, on the South by
Harmony Road, on the West by South Mason Street, and on the East by South
College Avenue. It is situate in the Southeast a of Section 35, Township
7 North, Range 69 West of the Sixth P.M., City of Fort Collins, County
of Larimer, State of Colorado.
EXISTING CONDITIONS: The site has a gross area of 5.45 acres and a net
area of 4.43 acres. Filings I and II of The Gateway at Harmony Road
P.U.D. are 2.6 acres of this total site. All of the streets around the
site have been constructed. Revisions to College Avenue will be required
to allow for a continuous right —turn lane. The existing topography slopes
from Northwest to Southeast at approximately 1.8% grade. There is no
offsite runoff entering the site. The 42" Mason Street Interceptor line
storm drain is located along the East side of this site. At present,
the site is covered with native grasses. There are three large cottonwood
trees along the East side of the site.
DESIGN: It is our proposal to detain the 100 year runoff on site in
the proposed parking areas. There are seven ponding areas with a total
capacity of 41,050 cubic feet. This exceeds the required capacity of
40,900 cubic feet as determined by the mass diagram shown on sheet one
of the calculation sheets. The average depth of the ponds will be 1.3
feet when at capacity. The outlet for the ponds will be into the 42
inch Mason Street Interceptor line. The approved amount of runoff into
this line is 0.5 c.f.s. per acre. The total runoff allowed from this
site is 2.73 c.f.s.
There are to be three points of release into the interceptor
line. The release rates at these points were determined by the size
of the ponds. At manhole 1 the release rate is 0.25 c.f.s.; at manhole
2 the release rate is 1.35 c.f.s.; and at manhole 4 the release rate
is 1.14 c.f.s. Each pond will have a restriction plate placed over the
outlet pipe to control the rate of release. The sizing of the outlet
plates is shown on sheets 3 and 4 of the calculations.
CONSTRUCTED: When this project is constructed as designed, it will meet
the City of Fort Collins Specifications.
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