HomeMy WebLinkAboutSILVER OAKS - AMENDED OVERALL DEVELOPMENT PLAN - 14-88E - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER-RELATED DOCUMENTSGEFROH HAUMAN INC.
ARCHITECTS/PLANNERS
CONSTRUCTION MANAGEMENT
135 West Swallow Road
Fort Collins, CO 60525
April 6, 1988 (303) 223-7335
Mr. Ted Shepard
City of Fort Collins
Planning and Development
Box 580
Fort Collins, Colorado 80522
RE: HORSETOOTH WEST MASTER PLAN
PROJECT 87-493
DRAINAGE CONCEPT
FORT COLLINS, COLORADO
Dear Ted:
The purpose of this letter is to outline the concept for disposing of storm
water runoff from this 60.45 acre parcel which will be known as the Horse -
tooth West Master Plan. The property is a mixed land use project with such
uses as single-family detached housing, multi -family attached housing, an
elementary school site, a child care center site, a neighborhood center, and
a road side commercial site.
Area -- The site is located at the Northwest intersection of Taft Hill
Road and Horsetooth Road with frontages of approximately 1400 feet and 2000
feet respectfully. The property is developed on three sides with residential
uses of various densities from estate type lots to a mobile home park. The
undeveloped property fees to the West.
Off -Site Contribution -- is considered non-existent when reviewing the
topography. The area crowns approximately in the Southwest corner of the
property. Irrigation canals West of the site will intercept or dam the
runoff from off site. The majority of this adjacent property runoff flows
North and West into Spring Creek.
The subject property is a relatively level property sloping from the South-
west corner to the Northeast corner. Previously used for crop land, there
was no significant topographic changes that occurred on site. The average
slope of the land is between one percent and two percent consistently cross
contour.
Historically runoff from the property has flowed to Taft Hill Road then
heads North to Spring Creek.
Method -- The study area will require that each individual parcel be design-
ed to meet its storm drainage requirements based on City of Fort Collins'
methods and formulas. At this Master Plan Stage actual anticipated volumes
of runoff above historic levels which need to be detained would be difficult.
Areas of impervious surfaces will be determined with the site's specific
• Mr. Ted Shepard
City of Fort Collins
HORSETOOTH WEST MASTER PLAN
April 6, 1988
Page 2
design. At this time generalities can be made as to the method water will
be detained and transported.
Storm drainage requirements for Parcels D, E, F, G, H, and 1; all tracts
exclusive of single family residential; will provide on -site detention and
will transport water through a system of curbs and conduits to the storm
drainage facility Parcel "C". Parcels A and B, the single-family areas, are
intended to use a combination of curbs, inlets and conduits to transport
runoff east to the drainage facility adjacent to Taft Hill. Primary de-
tention for these two areas will occur at that facility prior to being re-
leased down stream at historic rates.
The Neighborhood Center and the auto -related commercial area will provide de-
tention on site on hard surfaced parking areas prior to releasing at historic
rates through an inlet and conduit system to the facility at Taft Hill prior
to releasing down stream.
The school site, the child care and the multi -family areas will use combin-
ations of parking lot and landscape area -type detention and release through
swales, concrete channels, curbs and inlet and conduit systems. Runoff will
be transported to the facility at Taft Hill prior to being released down
stream.
Down Stream Release -- Currently the Rossborough Subdivision which lies
directly to the east end north of this Master Plan has developed a transport
system for storm drainage on the east side of Taft Hill Road continuous to
Spring Creek. In their original calculations, this property was factored
into their drainage transport capacity at the historic undeveloped land rate.
It is our intention to release water from our site at the historic rate into
this transport system. Our release would conduit under Taft Hill Road and
release into their system at the north end of our site and north of the cul-
de-sac on Newcastle Street of the Rossborough Subdivision.
Sincerely yours,
GEFROH HATTMAN INC.
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Fredric J. Hattman
Vice President
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