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There will not be any disturbance of the ground cover at this time. An erosion control plan
will be submitted with the building permit submittal. It will include a silt fence along the North
property line. Other control methods will be shown at the building permit submittal.
This drainage report is in compliance with the City of Fort Collins Storm Drainage
specifications and criteria. The runoff calculations were based on the newly adopted Rainfall
Intensity -Duration -Frequency Table. If you have any questions regarding this report, please call.
Sincerely,���,
y
.•���sreK�•.'o
Richard A. Rutherford, P.E. & L. S. 5 Q 2 8
RAR/meh *
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STEWARF&ASSOCIATES
' Consulting Engineers and Surveyors
' June 9, 1999
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
' P.O. 580
FortCollins, CO 80522-0580
Dear Basil,
' The following is the final drainage report for 609 City Park Avenue Subdivision which is
situate in the Northwest 1/4 of the Northeast 1/4 of Section 15, Township 7 North, Range 69 West
of the 6th P.M., City of Fort Collins, Colorado. The site contains 0.34 acres and is bounded on the
East by City Park Avenue, on the South by Crestmore Place and on the West and North by single
family residences. The site is in the Old Town Basin.
' The site has an existing single family residence on the South end of the lot. The lot has a
metes and bounds description and therefore it is required to be platted for any development to occur
' on the lot. Mr. Glover would like to build a new residence on the North end of the lot. The ground
cover on the pervious portion of the lot, is grass.
' The lot slopes from South to North at an approximate grade of 2.7%. On -site detention is
required unless the downstream outf dl system has the capacity for additional runoff The partof the
Old Town Basin that is bounded by Shields Street on the East, by Birch Street and Crestmore Place
' on the South, the Larimer County Canal No. 2 on the West and Mulberry Street on the North has no
storm drain pipe system. The area of the basin is approximately 47 acres and the land use is single
family residences. The total basin drains to an existing inlet at the Southwest comer of Mulberry
' Street and Shields Street where a storm drain carries the runoff East and North in the Old Town
Bastin. The primary route of the runoff in the 47 acres is in the gutters of the various streets to the
corner of City Park Avenue and Myrtle Street and then East in Myrtle Street to the West gutter of
' Shields Street and then North to the inlet at Mulberry Street and Shields Street. The ten year runoff
rate exceeds the allowable runoff rate for both local streets and the arterial street. The capacity of
the inlet at Mulberry Street and Shields street'is exceeded by the runoff from the minor storm
Therefore on site stormwater detention will be provided on the North end of the lot. The
required volume of detention is 2,448 cubic feet. The allowable discharge rate is 0.48 cubic feet per
' second. The detention pond will be designed at the time a residence on the North end of the lot is
submitted for building permit. A generic site plan was used for the calculations for the detention mass
diagram and then increased by 10%. The detention pond will be in a grass area for water quality
' treatment. Extended detention will be provided at the time the pond is constructed.
' James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
' Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
(1)
1 VICINITY MAP SCALE 1 I,= 1000
INDEX
1.
Vicinity Map
2-3.
Text of Report
4-5.
Storm Water Runoff Calculations
6.
Detention Pond Mass Diagram
7.
Offsite Stormwater Runoff Calculations
STORM DRAINAGE REPORT
FOR
609 CITY PARK AVENUE SUBDIVISION
OLD TOWN BASIN
PREPARED FOR
ROBERT K. GLOVER
JUNE 991999
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80521
TEL. 970-482-9331
FAX.970-482-9382