HomeMy WebLinkAboutDrainage Reports - 10/01/1987Final Approved Report
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FINAL DRAINAGE REPORT
FOR
LEMAY PLAZA P.U.D.
FORT COLLINS, COLORADO
OCTQBER 1987
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Prepared by: Parsons & Associates Consulting Engineers
432 Link Lane Plaza
Fort Collins, Colorado 80524
Project No.: 87.18 PDQ
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INTRODUCTION
The purpose of this study is to determine the quantity of storm
water runoff generated.by this project, the manner in which this
runoff will be accommodated by the proposed development and its
transportation into the proposed Lemay Avenue storm sewer system.
Drainage calculations for Lemay Plaza P.U.D. follow the methods
and parameters as outlined in the City of Fort Collins' Storm
Drainage Design Criteria.
The Rational Method was used to calculate peak flows for 10-year
and 100-year storms. Times of concentration were calculated
using. the "Overland Flow Equation", Page 3-5 of Criteria, and.
using a channel flow time calculated from -Figure "Estimate of
Average Flow Velocity for use with the Rational Formula", Larimer
County Stormwater'Management Manual.
The sump inlets were sized by using the Sump Nomograph, Figure 5-
2, Page 5-10 of Criteria.
Complete drainage calculations are included in the Technical
Appendix.
SITE DESCRIPTION
The site is located in Section 36, Township 8 North, Range West
of the Sixth Principal Meridian, County of Larimer, State of
Colorado. The Lemay Plaza P.U.D. consists of approximately 1.87+
acres. The project is bounded on the North by Conifer Street, on
the East by iemay Avenue, on the South by Lake Canal and on the
West by a detention pond (referenced to as "Detention Pond 105"
in Evergreen Park Basin Major Storm Drainage Study, dated
February 1981, by Engineering Professionals Inc).
The site historically drains from East to West with the natural
drainage flowing towards Dry Creek.
PROPOSED LAND USE
The proposed development of this site is commercial. It will not
be constructed in phases.
HYDROLOGIC ANALYSIS
The Rational Method has been used to calculate the stormwater.
runoff.for the 10-year and 100-year return period storms for the
Lemay Plaza P.U.D.. The.enclosed Drainage Exhibit defines Sub -
Basins A through E, and Table I summarizes the results of the _
hydrologic analysis of these sub -basins.
The historic runoff flows were not considered for this
development, because of its location adjacent to "Detention Pond
105". The Evergreen Park Basin Major Storm Drainage Study, dated
February 1981, indicates that Detention Pond 105 has been sized
to accommodate the runoff from the surrounding area, of which
Lemay Plaza P.U.D. is a portion of.
A 65' wide easement runs' parallel with the Southerly property
line on Lemay Plaza P.U.D.. This easement will be used to
transport the major storm runoff from Detention Pond 105, as well
as other areas and detention ponds located within the Evergreen
Park Drainage. Basin. This' runoff will be directed into a
proposed storm `sewer inlet located at the Southeasterly property
corner of the Lemay Plaza P.U.D.. The combined 100-year runoff =
55 c.f.s.. Nuisance flow and any runoff from the minor storms
will be transported from the Westerly property line of Lemay
Plaza P.U.D. to the same storm sewer system adjacent to Lemay
Avenue.
CONCLUSION
Drainage from and onto Lemay Plaza P.U.D. has been accomplished
by means of curb and gutters, concrete pans., -open channels and
storm sewers.
Prepared under the direct supervision of:
Todd A. Shimo a, P.E.
Colorado License #18792'�
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