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Lindimer Subdivision
Page 2.
The site has a moderate wind erodibility and a high rainfall erodibility.
The existing ground cover is very good pasture grass. Due to the flat condition
of the site, there will be no overlot grading and, therefore, only the street
area will be disturbed. The two detention basins will be constructed prior
to the beginning of any earthwork. Rock filters will be placed on the discharge
pipes to create sedimentation basins.
The runoff calculations, the detention pond mass -diagram and the grading
and drainage plan are included as a part of this report. If you have any
questions regarding this site or this report, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
President
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enclosures
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*: 5028
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
May 3, 1993
Ms. Kate Mahler
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Kate:
The following is the preliminary drainage report for Lindimer Subdivision
which is located on Birmingham Drive in the Southeast a of Section 27, Township
7 North, Range 69 West of the 6th P.M. The site contains 4.30 acres and is
at the very south end of the Spring Creek Basin.. It is bounded on the west
by the existing Rossborough Subdivison, on the northeast by the Pleasant Valley
and Lake Canal and on the south by an existing horse stable. The site slopes
gently from southwest to.northeast to the Pleasant Valley and Lake Canal.
Since the historic drainage has discharged into the Canal, the runoff actually
flows into the Foothills Drainage Basin, via the Canal, rather than into Spring
Creek.
Mr. Willis Smith -of the Pleasant Valley and Lake Canal Company has given
one of the owners, Mr. Linder, preliminary approval to continue to discharge
into the Canal at the historic runoff rate.
It is proposed to detain the difference between the 100—year developed
flows and the two—year historic flows. The present site is an existing grass
pasture. The proposed Use is for a fifteen lot single—family detached
residential subdivision.
The allowable discharge rate is 0.87 cubic feet per second. The developed
2—year, 10—year and 100—year flows are 2.73, 4.91 and 11.15 cubic feet per
second respectively. The required detention volume is 18,312 cubic feet.
It is proposed to carry the runoff to two proposed detention ponds on
the surface in the Birmingham Drive gutter and two concrete pans. The site
was divided into two sub -basins, "A" and "B", which each have a detention pond.
The ponds are located in drainage easements in the rear of rather deep lots.
They will be maintained by the property owners of the lot on which they are
located. The ponds will discharge into the Pleasant Valley and Lake Canal
through a pipe laid through an earthen berm.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
PRELIMINARY DRAINAGE REPORT
FOR
LINDIMER SUBDIVISION
MAY 3. 1993
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM STREET,
FORT COLLINS, COLORADO 80521
303/482-9331