HomeMy WebLinkAboutNATHAN'S SUBDIVISION, 637 COWAN STREET - PDP/FDP - FDP130030 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFORBES ENGINEERING
Full Service Civil & Structural Engineering
February 25, 2013
Glen Schlueter
City of Fort Collins
Stormwater Engineering
700 Wood Street
Fort Collins, CO 80521
RE: Grading & Drainage Certification Letter for site improvements at
429 So Whitcomb St.
Fort Collins, CO 80521
Mr. Schlueter,
This letter and attached exhibits are to serve as a drainage certification for the
above referenced single family residential property. The property is located at the
Southeast corner of South Whitcomb and West Mulberry. The home was
originally built in approximately 1910 and presently has one single family
residence and a detached garage/outbuilding on the property (see attached existing
grading plan). The surrounding neighborhood is a mix of small business and
single family residential lots.
Proposed site improvements include an 828 square foot garage addition to the
existing home along with a 572 square foot carriage house. Site improvements
will also include 1143 square feet of concrete to be used for drives and walks.
The spot elevations and contours for both the existing and proposed grading &
drainage plans are based on survey data provided by Edmonds Land Surveying,
Inc. dated May 18, 2012.
Historic storm water runoff presently is directed towards the street gutter systems
of both Whitcomb (front yard) and Mulberry (south side yard). This will be
maintained with the proposed improvements using roof gutters and downspouts to
direct the storm water runoff towards the south and east and into the street gutter
system (see attached proposed grading plan). Any necessary erosion control
measures will be provided at the time of construction including, but not limited to,
2
the provision of perimeter silt fencing and a vehicle tracking control mat if
necessary.
Both the garage addition and carriage house will be constructed with a finished
floor elevation 18 inches above the corresponding base flood elevation (BFE) as
defined by the City of Fort Collins Flood Plain maps.
It is my conclusion that with proper construction practice and observance to the set
finish floor elevation, no adverse affects to the site or to the surrounding
properties are anticipated from the proposed improvement of this site.
Sincerely,
_______________________
Kevin Forbes, P.E. #35265