HomeMy WebLinkAbout609 CITY PARK AVENUE - PDP - 7-99 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTI
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STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
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PH. 48Consulting Engineers and Surveyors
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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,
Q. a
Richard A. Rutherford, P.E. & L. S.
RAR/meh
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
IApril 19, 1999
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
rThe 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 Bice 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 outfall 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
Basin. The primary route of the runoff in the 47 acres is in the gutters of the various streets to the
' comer 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.
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
STORM DRAINAGE REPORT
FOR
609 CITY PARK AVENUE SUBDIVISION
OLD TOWN BASIN
PREPARED FOR
ROBERT K. GLOVER
APRIL 19,1999
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
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