HomeMy WebLinkAboutJORDAN SUBDIVISION - BASIC DEVELOPMENT REVIEW - BDR160017 - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE RELATED DOCUMENTwill be converted into a garage that will serve both the new home as well as the
existing residence at 518 Cherry Street (see proposed grading and drainage
plan).
The 518 Cherry property will remain relatively the same but for the
reconfigured lot limes and an addition of the garage. The converted garage will
have a concrete apron and gravel drive connecting to the existing gravel alley.
Existing contours for the grading & drainage plans are based on survey data provided
by Stewart & Associates Land Surveying, Inc. dated June 14, 2016.
None of the properties lie within any flood plains and the historic storm water runoff
presently is directed towards the street gutter system of North Whitcomb and Cherry
Streets. These historic drainage patterns will be maintained. Drainage flows for the
three properties were analyzed together and are broken up into two sub -basins. To
help maintain existing flow patterns, the proposed improvements will use roof gutters
and downspouts to direct the storm water runoff towards the west into the Whitcomb
gutter system and towards the east and south into the alley and Cherry Street gutter
system (see attached proposed grading and drainage plan). The grade at the face of
the new buildings will be elevated approximately 6 inches and the ground will be
graded to slope (at 1 % minimum) the drainage away from the homes.
The only grading for the development is a swale to make the drainage pattern travel to
the street between lots 2 & 3 and not across lot 3. This grading and the future grading
around the new house, garage, driveway and the addition to the house on lot 1 will be
less than 10,000 sq ft and this project will not require erosion control measures during
the development process.
As previously stated, none of the homes are in a floodplain and the finish floor
elevations have been raised so that the risk of flooding is very minimal.
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, °35265 , o
FORBES ENGINEERINP
Full Service Civil & Structural Engineering
August 14, 2016
Revised November 22, 2016
Dan Mogen
City of Fort Collins
Stormwater Engineering
700 Wood Street
Fort Collins, CO 80521
RE: Grading & Drainage Memo for site improvements at;
412 North Whitcomb Street (Parcel #97111-89-001),
518 Cherry Street (Parcel #97111-19-017) and
520 Cherry Street (Parcel #97111-19-008)
Fort Collins, CO 80521
Mr. Mogen,
This letter and attached exhibits are to serve as the grading & drainage memo for the
above referenced single family residential properties. All three properties are located
in the block at the northeast corner of North Whitcomb Street and Cherry Street. The
home at 412 North Whitcomb is in the Maldonado Subdivision and was originally
built in 1910, it has one single family residence on the property. The property at 520
Cherry Street currently has a duplex built in 1940 and a concrete parking area. The
home at 518 Cherry is a single family residence built in 1948. The surrounding
neighborhood is all single family residential lots (see attached existing grading &
drainage plan for block layout).
Proposed site improvements are as follows;
The 412 Whitcomb property will be extended to the east property line of 520
Cherry Street connecting with the existing alley. Improvements include a
revised 1972 square foot home with a 280 square foot guest room; connecting
breezeway and a detached garage (see proposed grading & drainage plan). It
will maintain a concrete walk in the location of the original walk and the
garage will be built with a concrete apron & gravel drive. It is the intent that
the new residence has a finish floor elevation approximately at the same
elevation of the original building. The finish floor elevation for the detached
garage has been set at approximately 0.5 feet above the existing grade.
The 520 Cherry Street property will have a new 1248 square foot single family
residence with reconfigured lot lines and a revised concrete drive. The duplex