HomeMy WebLinkAboutSILVER OAKS - PRELIMINARY - 14-88F - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTPRELIMINARY STORM DRAINAGE REPORT
SILVER OAKS P.U.D.
FOR
TRI-TREND, INC.
AUGUST 3. 1992
STEWART & ASSOCIATES, INC.
102 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
0 •
STEWART&kSSOCIATES
Consulting Engineers and Surveyors
August 3, 1992
Storm Drainage Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Gentlemen:
This is the preliminary storm drainage report for Silver Oaks P.U.D.
which is proposed at the Northwest corner of Horsetooth Road and Taft Hill
Road. It is situate in the South I of the Southeast a of Section 28, Township
7 North, Range 69 West of the 6th P.P. The P.U.D. will have 133 single-family
lots and 16 patio home lots on 38.17 acres.
The site is located in the Spring Creek drainage basin. It slopes gently
from Southwest to Northeast. The site is bounded on the East by South Taft
Hill Road, on the South by West Horsetooth Road, by Olander Elementary School
and private land in Larimer County on the West and by private land on the
North.
A four acre foot detention pond is proposed for the Northeast corner
of the P.U.D. The allowable outlet rate of 5.63 c. f. s. will discharge into
the existing 18-inch diameter R.C.P. storm drain which discharges into the
existing storm channel on the East side of South Taft Hill Road in the
Rossborough Subdivision. A storm drain will be constructed West along Bronson
Street for two blocks with inlets to ensure gutter capacity is met. The
detention pond will be owned and maintained by the Homeowners Association.
It is proposed that the convenience center along Taft Hill Road between
Horsetooth Road and Bronson Street will have its own onsite detention
facility. It is not a part of this P.U.D.
Olander School is the only area offsite that drains onto this P.U.D.
It has onsite detention and discharges at a historic rate across Auntie Stone
Street onto Silver Oaks P.U.D.
Silver Oaks P.U.D. has good existing ground cover. Its wind erodibility
zone is low and moderate, and its rainfall erodibility zone is high. It
is proposed to not overlot grade the P.U.D. but to leave the ground cover
on the lots. Lots 55 through 89 will be the first phase to be constructed.
The streets in the first phase will be constructed as soon as the utilities
are completed. The front part of the lots that have their ground cover
removed during the utility construction will be reseeded immediately after
the utilities are completed. Any stripped areas in the future phases, due
James H. Stewart
and Associates, Inc.
214 N. Howes Street
PO. Box 429
Ft. Collins, CO 80522
303/482-9331
0
•
Si 1 ve r Oaks P. U. D.
August 3, 1992
Page 2
to utility construction, will also be seeded. The detention pond will be
constructed at the beginning of the project. It will be used as a sediment
trap by having capacity for storm water to be retained long enough to settle
out sediment. The outlet pipe will have a straw bale and/or rock filter
to preclude sediment leaving the pond. The inlets proposed in the second
phase will have straw bale and rock filters during the construction period.
The pond will be seeded as soon as it is graded.
The preliminary drainage plan and the storm water calculations are
included as a part of this preliminary drainage report.
If you have any questions regarding this proposed P. U. D. , please call.
Sincerely,
Richard A. Rutherford, P. E. & L. S.
President
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enclosures
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