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Storm Drainage and Erosion Control Report
For Hampshire Pond East
Page 2
EROSION CONTROL
Hampshire Pond East is located in a moderate wind erodibility zone and in a high rainfall
erodibility zone. Sediment filters, and a silt fence shall be used to sediment control and reseeding and
mulching shall be done to control erosion. Rip rap shall be placed at pipe outlets. All erosion control
procedures shall comply with City of Fort Collins Criteria
STORM DRAINAGE AND EROSION CONTROL REPORT
FOR HAMPSHIRE POND EAST
EXISTING SITE AND DRAINAGE CONDITIONS
Hampshire Pond East will be 26 townhouse lots on 2.87 acres located on the extension of
Water Blossom Drive to the east of the existing Hampshire Pond Subdivision.
.The site slopes to the southeast on approximately a 2 percent slope. There is some natural
vegetation on the site. The runoff from the site is into Spring Creek which is located about 300 feet
to the southeast.
Drake Road lies along the north side of the site and curb, walk and pavement are existing.
The runoff in the south gutter of Drake Road is east towards Taft Hill Road.
The only offsite runoff is from Basin D6 of the Hampshire Pond Subdivision. This offshe
basin is 0.37 acres and the runoff quantities are Q2 = 0.37 c.f.s. and Q,00 = 1.38 c.f.s..
DEVELOPED CONDITIONS DRAINAGE
Hampshire Pond East will be developed by extending Water Blossom Lane about 300 feet to
the east to end in a cul-de-sac. Runoff from this cul-de-sac will be picked up in a catch basin and
piped east and south to an existing ponding area. This existing ponding area was constructed by the
Hampshire Pond Subdivision as a temporary holding and settling basin until the proposed regional
detention pond is constructed in the future. This existing pond which is constructed on City property
has an outlet into Spring Creek. We propose to not change the existing pond outlet or release rate,
but to enlarge the pond enough to hold the entire 100 year runoffvolume from Hampshire Pond East.
This will require a volume of 27097 cubic feet.
Storm runoff from Hampshire Pond East will be carried through the subdivision by street
gutters, concrete pans and pipes to the southeast comer of the site. Flows from the southeast comer
of the site will be carried to the detention pond in an open ditch. When the future regional detention
pond is constructed, flows from this southeast comer will go directly into the ponding area.
A copy ofthe drainage and erosion control plan for Hampshire Pond which was prepared by
Northern Engineering Services is included with this report. On this plan we have shown the proposed
pond enlargement and also the Hampshire Pond East development with the swale to the enlarged
ponding area. This ponding configuration is temporary and will be completely changed by the future
Taft Hill Regional Pond.
STEWART$,LSSOCWES
Consulting Engineers and Surveyors
August 21, 1995
Mr. Basil Hamdan
Stormwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil:
The following drainage report has been prepared for Hampshire Pond East, which an
extension to the east of Water Blossom Lane from the existing Hampshire Pond Subdivision. The
site is located on the south side of West Drake Road and a few hundred feet west of South Taft Hill
Road.
The site is located in the Spring Creek Basin. The site slopes to the southeast and historic
runoff is over land about 300 feet to Spring Creek.
The following drainage report complies with City of Fort Collins Criteria, except that we
request a variance from the criteria to leave the runoff from the Drake Road right-of-way in the south
flow lime as it now exists. There is negligible runoff from this site into the Drake Road right-of-way.
Sincerely,
f/�^�-~-�
Phillip I. Ro inson, P.E. & L.S.
Vice President
rsc 4502
enclosures
Mn
James H. Stewart
and Associates. Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
STORM DRAINAGE AND EROSION CONTROL REPORT
FOR
HAMPSHIRE POND EAST
PREPARED FOR
BRET LARIMER
PREPARED BY STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331
AUGUST 21,1995