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STORM DRAINAGE REPORT
FOR
FORT COLLINS HOUSING AUTHORITY P.U.D.
JULY 18, 1994
STEWART & ASSOCIATES. INC..
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
July 18, 1994
Mr. Glen Schlueter
Storm Drainage Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Glen:
This is a revision to the drainage report for the Fort Collins Housing
Authority office and maintenance facility site at 1715 West Mountain Avenue.
The grading, drainage and utility plan was signed and approved in February
1992. At the hearing for the Final P.U.D. plan, the site plan was denied
due to neighborhood opposition, and the Final Plat for the P.U.D. was approved.
The Housing Authority has revised the proposed addition to the building
and is resubmitting the plan for approval. The amount of additional impervious
surface has decreased by 512 square feet from the 1992 plan. The amount of
impervious surface being added to the historic area is 2926 square feet.
The reason the impervious area proposed at this time is less than in 1992
is because part of the building is being constructed where concrete existed.
The enclosed grading, drainage and utility plan has been revised to
delineate the proposed addition. The runoff calculations have also been
revised for the new proposal. The original text of the report is enclosed.
The Housing Authority would like the revisions approved since there is
less runoff with this plan than the 1992 plan. If you have any questions
regarding this site, please call.
Sincerely, d
Richard- A. Rutherford, P. E. & L. S.
President
jrr
enclosures
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
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COMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482.9331
? A Date_2[LB Client: %nrZr GoLL/nl r Na ,r / ,i ,A, ry,P,rSheet No.4- of S
Chkd By: Date Project: Foc T C ot-. / r fio os mi & A V rN j e. / r v P. U. D
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COMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
A e Date I ` Client: Eor2 r(- of 1A, r Ho ,1 t G A ,rH a r)z Sheet No. S of
Chkd By: Date Project: Fn ,e •r , oL liuf H oux i v a Au rigo t r v P,
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STORM DRAINAGE REPORT
FOR
FORT COLLINS HOUSING AUTHORITY P.U.D.
February 6, 1992
STEWART & ASSOCIATES, INC.
214 NORTH HOWES STREET
FORT COLLINS CO 80521
STEWART& SSOCIATES
Consulting Engineers and Surveyors
February 6, 1992
Ms. Susan Duba Hayes
Storm Drainage Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Susan:
The following is the storm drainage report for the Fort Collins Housing
Authority P.U.D. which is the site of their administrative offices at the
Southwest corner of West Mountain Avenue and Bryan Street. The address of
the site is 1715 West Mountain Avenue, and it is located in the Old Town Basin
The site is bounded by West Mountain Avenue on the. North, the City Park
Softball Parking Lot and then the Larimer County Canal on the East, the City
Park Softball Fields on the South, and City Park Nine and the Trolley Barn
on the West. The site contains 0.38 acres and slopes from Northwest to
Southeast. The site has the Fort Collins Housing Authority's existing office
and maintenance building and two small sheds. The Housing Authority is
proposing to construct a 2,688 square foot addition to the building and a
concrete driveway. The increase of impervious surface is 3,438 square feet
which is 20.5% of the site. In the two—year storm, the runoff increases by
0.19 c.f.s., and in the 100—year storm, the increased runoff is 0.95 c.f.s.
The site generally drains from the West side of the site Easterly to
an existing detention pond in the existing City Park Softball Parking Lot
by sheet flow. The asphalt parking •lot has an existing area inlet in a sump
condition which discharges into the Larimer County Canal through an 8—inch
diameter corrugated metal pipe. A small area of grass at Hole One of City
Park Nine drains onto the property as the only offsite drainage.
Due to the small size of the proposed addition, relative to the large
green area of the softball fields and City Park Nine golf course, we are
requesting that no additional detention be required on this site. The runoff
will sheet flow at very low velocities over turf to the existing inlet. The
time of concentration over the turf is 24 minutes.
There is no erosion from the existing site since it is all impervious
surface or bluegrass turf. There are no public improvements to be constructed,
James H. Stewart
and Associates, Inc.
214 N. Howes Street
P.O. Box 429
Ft. Collins. CO 80522
303/482-9331
Ms. Susan Duba Hayes
Fort Collins Housing Authority P.U.D.
February 6, 1992
Page 2
except their new driveway out to Mountain Avenue. The only area that will
be disturbed is the 2,688 square foot building and the 750 square foot
driveway. The Contractor will be allowed seven (7) calendar days to begin
construction of the building addition and new driveway after the sod has been
removed. If construction is not underway within the time period, erosion
control measures will have to be installed per City Criteria and a security
submitted.
The historic and developed runoff calculations and the grading and
drainage plans are enclosed as a part of this report.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
President
jrr
enclosures
COMPUTATIONS
Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
P.A i2 Date/171 l L Client: Fn .r .o / lr /-/o ,r iA,r o4yryoripSheet No.4- of S
Chkd By: Date Project: Foe r C OLL /A1 r No ur /AI r v ra10 a / r v P
Subject &Tn P_AA A2 A.IA16a E /` VAIOFF l /-ALL u LA770,Qr /
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COMPUTATIONS
. Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
A i2 Date 1/17/9z. Client: nmrC.otnAi;r Hb rA 6 Au1vv rrSheet No. S of_�,
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