HomeMy WebLinkAboutONE PROSPECT PUD PRELIMINARY AND FINAL - 17 90 AND 17 90A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTEl
STORM DRAINAGE REPORT
FOR.
ONE PROSPECT P.U:D
PREPARED FOR
W.W. REYNOLDS COMPANIES
APRIL 7. 1990
PREPARED BY
STEWART & ASSOCIATES. INC.
AMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St: Ft; Collins, CO 80521 (303) 482-9331
By; P 1 R Date __ sly Client: - In/ W. R e v n old Sheet No. �of / U
ChUBy: Date Project:_ One _.Z�r_osr�ec� P. 1, D,
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SITE LOCATION
STORM DRAINAGE REPORT
ONE PROSPECT P.U:D:
One Prospect P.U.D. is a replat of Lots 1, 2, 13, 14, 15 and 16 of
Prospect Park East P.U.D.. It is located in the Northwest I of Section
20, Township 7 North, Range 68 West of the Sixth P.M., City of Fort
Collins, County of Larimer, 'State of Colorado, and is bounded by East
Prospect Road on the north, Midpoint Drive on the south, Specht Point
Road on the west, and Prospect Parkway on the east. The site is located
in the Spring Creek drainage basin.
EXISTING SITE CONDITIONS
The existing site is covered with sparse vegitation, and the surrounding
streets are all paved and have curb and gutter. There is an existing
drain swale running west to east through the site. Concrete drain pans
are existing across Specht Point Drive on the west and across Prospect
Parkway on the east, which channel runoff water into and out of the
existing swale. The entire One Prospect P.U.D. site drains to this swale.
There is no storm water detention provided on developed sites or proposed
on new sites in the Prospect Park East P.U.D. development. This is
because the development is adjacent to the Cache La Poudre River, and
drainage swales have been provided to carry runoff to the river.
OFFSITE DRAINAGE ONTO THE SITE
Tract "A" of Centerpoint Park, which is presently undeveloped, but which
will be developed in the future under HB zoning, drains through the Swale
across the One Prospect P.U.D. site. The area of Tract "A", plus the
surrounding streets which will contribute runoff, is 13.4 acres. 3.7
acres of this total will drain directly into Spring Creek, leaving a
total of 9.7 acres to drain through the One Prospect P.U.D. Swale.
According to Engineering Professionals' March 1988 Spring Creek drainage
study, the 100 year storm will produce more. flow, by 75 c.f.s., than
can be passed through the Burlington Northern railroad bridge. This
75 c.f.s. overflow will run southeasterly along the west side of the
Burlington Northern tracks, and will cross the tracks in the vicinity
of Timberline Road. Calculations on sheet 4 of this report show that
17 c.f.s. of the 75c.f.s. overflow will flow to the east side of
Timberline Road, and will possibly add to the 100 year flow through the
One Prospect. P.U.D. swale. Sheet.6 of this report is an aerial photo
of the Burlington Northern railroad, Timberline Road intersection which
.shows elevations of the railroad and pavement.
DEVELOPMENT OF SITE
This site will be developed as buildings and paved parking lots as shown
on the plan at sheet 10 of this report. The site has three drainage
sub -basins. The west basin plus the offsite flow must be carried between
the west buildings in a drainage channel. Sheet 9 of this report shows
the channel section and calculated flow depths.
One Prospect P.U.D. Storm Drainage Report
April 7, 1990.
Page 2
The central basin runoff is calculated on sheet 7 of this report. The
central basin plus the west basin and the offsite flow must pass through
the drainage channel between the east buildings. This channel section
and the calculated flow depth are shown on sheet 9 of this report.
The third basin is the east building roof drainage and east parking areas.
This runoff will be added to the offsite from the west along with the
runoff from the west and central basin to produce the total flow acress
Prospect Parkway. This calculation is shown on sheet 6 of this report.
We have designed the site so that the offsite and onsite flow will pass
between the buildings without endangering the buildings, and also so
that there will not be a. water depth of more than 1.5 feet in the parking
lot.
PhiPhill�Robinson, P.E. & L.S.
AMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By; FIX Date Client: W. W. PKevnol T Sheet. No. 3 of I1U __--
Chkd By: Date Project: - One S;2e-C - ?. U- D •
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OOMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By: pI F� Dates 0 Client:— �%. V✓• Fe=optdS - Sheet No. ¢ of_r o
Chkd By: Date__ Project:- On e l:i-oS$>, ec4-
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AMPUTATIONS
Steyvart & Associates, Inc. 214 N. Howes St.
By: Pit'< DateT7 Client: W--LA/-
Chkd By:— Date— Project: On el F7rO-r,&;2 e? r-4-
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*OMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By: El K Date S 7 Client: VJ• % ✓ • R e �en oid f Sheet No ---!--Of /0
Chkd By: Date Project: Otlf-_. Prosfle(4
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@OMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By: p1 Date S_ fD Client: t✓ W- /?Z7e7n01 cs Sheet No. - 8 - of-
Chkd By: Date Project: n pP_.t_^_ .C.rOSDe� U • �.
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