HomeMy WebLinkAboutDrainage Reports - 12/07/20001
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i.,,v Z 9 2000
DRAINAGE REPORT
FOR THE
REPLAT OF LOT 3 OF THE SCARPELLA SUBDIVISION
LOCATED IN THE CANAL IMPORTATION BASIN
PREPARED FOR
MICHAEL SCARPELLA
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
TEL. 970-482-9331
FAX. 970-482-9382
NOVEMBER 28, 2000
0
' TABLE OF CONTENTS
' 1-2 Cover Letter and Teat
3
Vicinity Map
'
4
Imperviousness of South Basin
'
5
Imperviousness of North Basin
6
Runoff Calculations
7
Runoff Calculations
8
Swale Calculations
Pocket
Utility and Grading Plan
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STEWAru&asSOCIATES
Consulting Engineers and Surveyors
November 28, 2000
Mr. Basil Hamdan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
RE: Replat of Lot 3 of the Scarpella Subdivision
Mr. Michael Scarpella owns Lot 3 of the Scarpella Subdivision which is located at 2400
West Prospect Road. Lot 3 extends from Prospect Road on the South to Evergreen Drive on
the North, and there is an existing house and a detached garage located on the South part of
the lot. W. Scarpella desires to divide the lot so that the vacant North portion of Lot 3 can
be made into a separate residential lot which will face North onto Evergreen' Drive.
The proposed new lot drains Northerly to Evergreen Drive, and also the North portion
of the existing residence drains to Evergreen Drive. The South portion of Lot 3 drains
Southerly to Prospect Road. The drainage South to Prospect Road will not be changed by the
proposed development. The North portion of the South lot, which includes the North half of
the roof and the rear yard, will drain across the new North lot to Evergreen Drive. This is the
historical drainage pattern. An eight foot drainage and utility easement will be dedicated over
the East side of the North lot to provide a path for this offsite flow. The drainage basins and
flow patterns are shown on the utility and grading plan included in this report.
Lot 3 is located in the Canal Importation Basin, and the developed percent
imperviousness used in the calculations for this basin is 45 percent. The calculated developed
percent imperviousness of the North basin, which includes the North part of the existing house
and garage, the proposed new residential construction and the pavement to the center of
Evergreen drive, is 45 percent, and the percent imperviousness of the South basin, which
includes the South part of the existing house and garage and the pavement to the center of
Prospect Road, is 41 percent.
Since the percent imperviousness of the proposed development is not greater than that
used for calculations in the Canal Importation Basin, a variance is hereby requested from the
requirement of on -site detention. Also, a variance is requested from the requirement for on -site
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
water quality control procedures. There should be no erosion control measures required for
the construction of the single family residence on a lot with an area of 7553 square feet.
The storm drainage calculations and procedures provided and proposed for this project
are in compliance with the City of Fort Collins Criteria.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
PIR/meh
4502
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BASIN SUMMARY: (CANAL
SOUTH SASINI
ARN . 13900 SP - 0.32 A9.
HISTORIC C • 0.5) SAAE
0SVELOPEO C. 0,913
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NO ON 111E DETENTION
BASIN PERCENT IMPERVIOUSNESS=
SITE PERCENT IMPERVIOUSMESS •
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TOTAL NORTH BASIN.
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HISTORIC C: 0.4.5
DEVELOPED C2 0.5}
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Q0: 0.72 af•
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NO ON SITE DETENTION
"SIN PERCENT IMP£RVIOUSNEfs_
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SITE PERCENT IMPERVIOUSNESS=
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NORTHEAST BASIN:
AREA 2 5100 SF = 0.117 Ac.
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LEGEND
..,., existing spot elevation
a -._ - existing contour
�— 93� finish contour
flow direction
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CAPACITY TO FYcv. 92.0 : 2.1 cis
SECTION A -A _
S wq LE ALONG EA T SIDE OF LOT z
2'
915
.... _-Maw,. r •I�
A
'., N07ESI
1. Minimum corer Over water line is 4.5 feet.
2. Maximum cover over water line is 5.5 feet.
J. Limits of asphalt repolr to be determined by the City Engineering Inspector
City of
Fort Collins, Colorado
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