HomeMy WebLinkAboutVALLEY STEEL ADDITION - PDP - 34-05 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTacres. Sub basin 2 is South of Sub basin 1 and runs to the North right-of-way line more
or less of Hickory Street. The area is 2.22 acres. The site slopes Northwest to Southeast
at 0.4%. Existing cover is grass, weeds and gravel. All runoff is to Hickory Street. Sub
basin 3 is Hickory Street. The area is 0.4 acres and the gutter slope is 0.4% to East.
DEVELOPED SITE:
The owner is proposing to develop a 19,720 s.f metal warehouse, parking and driveways
as shown on sheet 5 of the Utility Plans. The site is divided into four sub basins.
Sub basin A: This is the same as the historic Sub basin 1 which is the North 75 feet of
the site. Because there is no construction, other than a 50 x 10 foot concrete pad
matching existing grade in this basin, no storm water detention is proposed.
Sub basin B: The West portion of the site and all of the proposed building to the new
right-of-way of Hickory Street. The area is 1.10 acres. Runoff from this basin is to the
water quality structure in the grass area at the Southwest comer of the site, then released
to the street at 0.22 c.f.s. The pond is sized to handle the required storage and the
extended 40-hour volume.
Sub basin C: This is the East portion of the site to the new Hickory street right-of-way.
The area is 1.12 acres more or less. All runoff is to the water quality structure located in
the grass area between the building and driveway entrance. Release from the pond is at
0.22 c.f.s. and is to Hickory Street. The pond is sized to handle the required storage and
the extended 40-hour volume.
Sub basin D: This is the North 1/2 of Hickory Street and the same as historic Sub basin
3. There is no way to route this basin through our detention pond system with everything
being on minimum slope and this sites runoff being routed to the street flow line.
EROSION CONTROL:
A silt fence will be placed along part of the East, South and North sides of the site during
construction. The detention pond area in the grass portion will be used as a sediment
pond during construction. .Straw bale dikes will be places around both erosion control
structures during construction.
The City's required erosion control amount for this site is $4800.00.
Sincerely,
Franklin D. Blake,
FDB/pak
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
August 9, 2005
Mr. Basil Harridan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
Valley Steel and Wire is developing a warehouse on the 3.4-acre site west of their
existing business at 200 W. Hickory Street. The new development is being called Valley
Steel and Wire Subdivision. The project is in the City of Fort Collins Dry Creek Basin.
Release rate in this basin is 0.2 c.f.s. per acre.
HISTORY:
This project is an infll as most of the properties around this area have been developed. It
is located in both the City of Fort Collins and FEMNs Flood Plain. The Northeast corner
of this site is in the City's Floodway and is restricted to "No Rise". The base flood
elevation is at 4976.0 feet as shown on FEMA, which is more restrictive than Fort Collins
base flood elevation.
DESIGN CRITERIA:
The rational method will be used to determine the sub basins initial and major storm
runoff for this project. Building elevation will be at 4977.7 feet, which is 1.7 feet above
the FEMA Base Flood Elevation on this site. There will not be any construction in the
City Floodway.
Detention will include the required volume and the 40-hour extended Detention volume.
The pond release rate will be at 0.2 c.fs. per acre.
EXISTING SITE:
This site is situate in the Northeast 1/4 of Section 2, Township 7 North, Range 69 West of
the Sixth P.M., Fort Collins, Larimer County, Colorado. The area is 3.0625 acres. The
Gross area to the centerline of Hickory Street is 3.4 acres.
The site is bounded on the North by undeveloped land; on the East by the existing Valley
1 Steel and Wire business; On the South by Hickory Street which is constructed and on the
West by a warehouse. There are three existing sub basins. Sub basin 1 is the North 75
feet of this site. Runoff is directly east along the existing railroad spur. The area is 0.78
I=
s James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
I" 970/482-9331 • Fax 970/482-9382
i+: .
FINAL DRAINAGE AND EROSION CONTROL REPORT
FOR
VALLEY STEEL AND WIRE SUBDIVSION
DRY CREEK BASIN
PREPARED FOR
JCL ARCHITECTURE
August 9, 2005
STEWART & ASSOCIATES, INC.
103 S. MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
PHONE: 970-482-9331
FAX: 970-482-93 82