HomeMy WebLinkAboutHECKART SUBDIVISION - PDP - 35-03 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTSTEWART&ASSOCIATE$
103 S. MELDRUM, FORT COLLINS, CO 80521
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Consulting Engineers and Surveyors
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STROM DRAINAGE AND EROSION CONTROL
HECKART SUBDIVISION
PROPOSED DEVELOPMENT:
The proposed Heckart Subdivision is situate in the Southeast 1/4 of Section 9, Township 7
North, Range 69 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. It is in Sub -
basin Number 50 of the City's West Vine Basin. The site area is 1.63 acres more or less.
This project will be to develop two residential lots. There is an existing house and separate
garage which will be on one lot. The new building lot will be located in the Southwest corner of
the property and will be 12,650 square feet.
EXISTING CONDITIONS:
The property is bounded on the North by Laporte Avenue; on the East by undeveloped land and
the New Mercer Ditch which cuts across the Northeast corner of this site; on the South by
undeveloped land; and on the West by the Tenth Green Second Filing which is fully developed.
There is an existing house and garage which will remain with this development. There is an
existing well located on the East side of the property. The property has a low point on the East
property line about 215 feet North of the Southeast property corner. All runoff is to this location.
The slope from the Southwest corner to this low point is about 1.5%. The slope from the
Northwest corner is about 1%. There is existing curb and gutter across the loth Green Second
Filing along LaPorte Ave that dumps runoff on to our site. It then flows across the North side of
this site to the low point which then flows into the New Mercer Ditch. Runoff also flows into an
area inlet on the South side of the main asphalt road on LaPorte Avenue. There has been some
new asphalt patching and placement to help direct runoff into this inlet recently. The pipe from
this inlet is Southeast directed to the New Mercer Ditch. All runoff from this site is to the New
Mercer Ditch. There is no runoff onto this site from the East. There is runoff onto this site from
the South, West, and North.
DEVELOPED CONDITIONS:
This project will be to develop two residential lots, one is 12,650 square feet and the other one,
which will be the existing house and garage is 49,660 square feet.
The only proposed improvements to the developed site will be the six foot sidewalk along
Laporte Avenue; upgrade the existing driveway to be 20 feet wide and extend it to the new house
in back; and construct the new house which is a proposed modular at this time.
This project will not have detention or extended detention or erosion control with the
construction of the house. The allowable impervious percent for the 100-year event used for the
Sub -basin No. 50 was 45%. This project's impervious percent is 24%, therefore with the
development of this site we are below the allowable. Also, the new roof drains will be directed
to grass swales and then directed offsite as it does historically not requiring detention or
extended detention.
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STEWART&ASSOClATES
Consulting Engineers and Surveyors
October 14, 2003
Mr. Basil Hamdan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
This project will develop two residential lots from one residential lot. The site area is 1.63 acres
gross. The site is in the City of Fort Collins West Vine Basin, Sub -basin No. 50. It is located in
the Southeast 1/4 of Section 9, Township 7 North, Range 69 West of the Sixth P.M., Fort
Collins, Larimer County, Colorado.
We are proposing to not have any detention, erosion control, and extended detention on this
project, as we are below the 45% 100-year impervious condition allowed in this sub -basin.
If you have any questions or need any more information regarding this project, please let me
know.
Sincerely, ,. •.••
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Franklin D.
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James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
HECKART SUB dmg ryt.dm 970/482-9331 • Fax 970/482-9382
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STORM DRAINAGE & EROSION CONTROL REPORT
FOR
HECKART SUBDIVISION
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I
LOCATED IN THE CITY OF FORT COLLINS
I WEST VINE BASIN
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PREPARED FOR
I' FRANK HECKART
I
OCTOBER 14, 2003
PREPARED BY
STEWART & ASSOCIATES, INC.
P.O. BOX 429
103 SOUTH MELDRUM STREET
iFORT COLLINS, CO 80522
TEL: 970.482.9331
FAX: 970.482.9382
HECKART SUB dmg rptdm