HomeMy WebLinkAboutKRUGER OFFICE BUILDING - PDP - 10-98 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTi7--
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PH. 482-9331 FAX 482-9382
STEWART&LSSOCIATES
Consulting Engineers and Surveyors
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: Date: 9 S Client: Dole KTUaP_7 Sheet No. S of
Project:
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Magnolia Street. This concrete pan will also pick up roof down spout drainage from the
proposed new building on the site and also some offske runoff from the existing building located
to the west. This concrete pan will be constructed low enough so that it will not block runoff
from the west.
A silt fence shall be installed along the south and east property line during the grading process.
The minimum erosion control collateral of $1000 will apply on this project.
Sheets showing the calculation of runoff coefficients, release rates, restricted pond outlets,
required detention, and provided detention are in this report.
A copy of the 1978 aerial photo showing the original residence and garage is also included in
this report.
A copy of the Grading, Drainage, and Utility plan is included in the pocket of this report.
This report was made in compliance with City of Fort Collins Criteria.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
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STEWART&&SSOCIATES
Consulting Engineers and Surveyors
Feb. 12, 1996
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
We have prepared a drainage study of the lot located at 218 West Magnolia Street. This is
Lot 20 of the F. J. Spencer Subdivision of Lots 14, 15 and 16 in Block 103 of the City of Fort
Collins. The lot is 47.50 feet wide and 138.00 feet deep and is located on the north side of
Magnolia Street and on the west side of a 20 foot wide alley. This site is located in the Old Town
Basin.
The existing site is a graveled parking lot which is used by the First National Bank. There is a
1978 aerial photo which shows the site with the original residence and detached garage. A site
runoff coefficient of 0.5 is calculated using this original house and garage as hard surface, and that
is equal to the existing graveled site runoff coefficient of 0.5.
We propose to allow the new building on the front portion of the lot to drain undetained into
the alley along the east side and onto West Magnolia Street along the south side, just as the
original house did. The new paved parking area on the north portion of the lot will be designed as
a detention ponding area. This ponding area will receive runoff from the north portion of the site,
from the paved private alley located to the north and west, and from the paved parking lot of the
adjacent lot located to the west. The new parking lot will be constructed low enough to receive
these offsite flows without causing any blockage of offsite flows from the north or west.
We have not included any detention volume for the adjacent public alley or for West
Magnolia, but we are providing detention for the adjacent private alley to the north and for the
adjacent paved parking lot to the west. No other previous developments in this block provide
detention.
The release from the proposed parking lot detention pond will be from the southwest comer
of the pond and then in a concrete drain pan along the west edge of the site to the gutter on West
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
Table of Contents
1 and 2 Letter and narrative report
3 Vicinity Map
4 Lot survey map
5 Runoff coefficients and release
6 Detention calculations
7 1978 aerial photo of historic site
Pocket Grading, Drainage and Utility Service Plan
STORM DRAINAGE REPORT
FOR
218 WEST MAGNOLIA STREET
LOCATED IN THE OLD TOWN BASIN
PREPARED FOR
DALE KRUGER
C/O W. J. FRICK DESIGN GROUP
FEa. ) 2 1996
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331