HomeMy WebLinkAboutDrainage Reports - 02/06/1989FINAL DRAINAGE REPORT
FOR
WEST ELIZABETH PROPERTIES P.U.D.
PHASE ONE
n
FINAL DRAINAGE REPORT
FOR
WEST ELIZABETH.PROPERTIES P.U.D.
PHASE ONE
FEBRUARY 6, 1989
Prepared by: PARSONS & ASSOCIATES'
432 Link Lane Plaza
Fort Collins, Colorado 80524
(303) 221-2400
PROJECT NO. 87.24 TCO
1.
' PRELIMINARY,., .
DRAINAGE REPORT
FOR
WEST ELIZABETH PROPERTIES P.U.D.
PHASE ONE
' West Elizabeth Properties P.U.D. is located on the south side
of West Elizabeth Street,'just west of Shields in the area.known
as Campus West. The P.U.D. consists of Lots 1, 2, 3, and 4 of
Second Campus West Subdivision. The P.U.D. is bounded on the west
by the Campus West .Theater parking. lot, and on the east by a
retail building.
' The site is presently developed with (from west to east) a
car wash, a small vacant restaurant, another vacant restaurant,
and a retail shopping building. There is only a little
landscaping in front of the east two buildings.
The car wash will be entirely rebuilt and a fast food
restaurant with a drive -up window will occupy the smaller vacant
' building (noted as Phase One). Additionally, curbs, radius
returns, and landscaping will be installed.
' Because the site is almost entirely covered with asphalt or
building, and because the proposed improvements will add
landscaping, there is no requirement for detention since runoff
' will decrease.
The surface runoff, from the site drains :to the north and
south, roughly splitting in the middle of the site. The runoff
' flowing north will enter West Elizabeth entering an inlet at the
northeast corner of the site. The storm sewer at this point is a
24" RCP. The runoff flowing south will enter a swale located on
' the property to the south and flows to the east.
The site is in the Plum Street Sub -Basin. According to Dave
t Frick of Resource Consultants, historically there is a flow of
approximately 780 c.f.s. fori the 100-year storm, _down West
Elizabeth. This would mean a floodplain width 'of 350 feet
centered on the street center line -and a maximum depth of 2 1/2
' feet. However, the Fort Ram Village project upstream will detain
some of this runoff, reduce peak flow to as low as 300 c.f.s.,
reducing top width to 200 feet and depth to one foot.**
1
1
The runoff computations for the 100-year and 10-year storms
were made using the Rational Method. These are shown on the
summary sheets attached to this report. The results show a
decrease in runoff coefficients. This results in a corresponding
decrease in peak runoff.
According to Glen Schlueter of the Storm Drainage Utility,
there is a water ponding problem along the east property line of
this site. The problem appears to be on the adjacent property and
is caused by a very flat slope and the installation of an electric
transformer pad. While this report only addresses Phase One, it
appears the planner has suggested installing a new curb along the
east property line, directing the drainage to the south, which
will reduce the amount of water in this ponding area. When Phase
Two of West Elizabeth ,Properties P.U.D. comes in for approval,
this subject can be addressed more fully.
** Using this information, the finished floor elevation of the new
car wash was set above the existing floodplain. (It also should
be noted that while this report uses the word "floodplain", the
site is not in a regulated floodplain or floodway zone.)
This report was prepared by:
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Revision- B _Yalu ®®. C. N [®-i ,lq. f> ®,f`� C e /p'-' Project: No -— - PARSONS R V O l \ lJ 6R, [ 1 V V O ��rl �P' S 0] 24 TCO
r aLane.,Plaza s 20 , ELIZaRETH 'PROPERTIES PUB s22
432 Link .
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-- CONSULTING ENGINEERS (303)221 200 Draftsman L.O Prepared: FE13. 09 [JI ��'-1Y "1�L �s1�`yLl"`" urinals