HomeMy WebLinkAboutHARMONY NEIGHBORHOOD CENTRE P.U.D. - PRELIMINARY - 33-94 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE RELATED DOCUMENTTST, INC.
The Preliminary Utility Plan being submitted now is consistent with the assumptions and zoning presented
in the Golden Meadows Fifth Filing Drainage Report. We believe that this letter and the accompanying
Utility Plan satisfy the City's requirements for a Preliminary Drainage Report. We look forward to your
review and comments and will gladly answer any questions you may have.
Very truly yours,
TST, INC., CONSULTING ENGINEERS
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Donald N. Taranto, P.E.
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David B. Lindsay
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Mr. Glen Schlueter
City of Fort Collins
Stormwater Department
235 Mathews
P.O. Box 580
Fort Collins, CO 80522-0580
RE: Harmony Neighborhood Centre P.U.D.
Project No. 10-790-000
Dear Glen:
June 6, 1994
We are sending you this letter in lieu of preparing a formal Preliminary Drainage Report for this site.
This site is located in the Golden Meadows Subdivision and is bounded by Harmony Road to the South,
Monte Carlo Drive to the North, Wheaton Drive to the West, and McMurray Avenue to the East. The
site is zoned BP and covers approximately 17.8 acres.
The "Golden Meadows Fifth Filing Storm Drainage Report" was submitted to the City on December 22,
1980 by Stewart and Associates, Inc.. The proposed King Sooper's is referred to in that report as Tract
"B" (BP Zone). Developed condition release rates from this site were calculated using the Rational
Method. Their calculations show two release points for the site. The South Western 13.0 acres was
proposed to outfall into an existing conveyance channel adjacent to Harmony Road. The developed
condition 10-year runoff was calculated to be 42.5 cfs and the 100-year runoff to be 83.4 cfs. A release
rate of 10.0 cfs was calculated which would require approximately 2.0 Ac.-ft. of on -site detention (Their
calculations for the detention volume were not shown). The second release point is at an existing 18"
RCP at the Northeast corner of the site. The pipe is tied into an existing storm sewer system that crosses
McMurray Avenue and passes through an elementary school site. Their calculations indicate that 3.9
acres of this site may discharge undetained through the 18" RCP. The 10-year developed condition
runoff was calculated to be 23.4 cfs. Both the storm sewer system and the existing channel along
Harmony Road discharge into the Golden Meadows Detention Pond located North and East of this site.
The proposed King Sooper's site will follow the Drainage Plan outlined in the above mentioned report.
The Final Drainage Report will present a more indepth analysis of the site hyprology, proposed storm
sewer hydraulics, and an erosion control plan will be presented, all of which will be done using the
current City Storm Drainage Criteria. A more detailed investigation into the Northeastern release point
will also be conducted because of a minor discrepancy we have identified in the 100-year peak flow in
the storm sewer system between the report for the Golden Meadows Fifth Filing and the Drainage Report
for the elementary school ("Drainage Report for the proposed 1992 S.E. Elementary School" by CDS
Engineering Corporation, August, 1991).
TST INC.748
Whalers Way - BuildingD
1021nverness Terrace East
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ConSU)fing Engineers
Fort Collins, CO 80525
(303) 226-0557
Suite 105
Englewood, CO 80112
Metro Denver (303) 595-9103
(303)792-0557
Fax (303) 226-0204
Fax (303) 792-9489