HomeMy WebLinkAboutCLIFF SUBDIVISION REPLAT - PDP - 22-99 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT. . Ib
5. The possibility of impacting adjoining properties due to changes of flow concentration
points has been mitigated be the careful placement of the down spouts as shown in the
drainage and grading plan.
6. Rain and wind erosion control as well as concerns of tracking of mud onto Prospect St.
are addressed by improvements to the existing and proposed driveways occurring at the
beginning of the construction sequence thereby maximizing the distance between any
site disturbance and points of out flow. The possibility of impact on the adjoining vacant
lot to the east of the construction area is addressed by the existing grades and by a
erosion control fence to be constructed before any site disturbance occurs.
Should you have any questions or comments as you review this project please feel free to contact me
at 690-6711.
V
Snyder
Cliff DweWings by
Criff Snyder
511 E. Prospect St.
Fort •Cof w, CO 50525
August 7, 1999
Mr. Glen Schlueter
City of Fort Collins
Stone Water Utility
700 Wood Street
Fort Collins, CO 80522
RE: Cliff Minor Subdivision
Fort Collins, CO
Dear Glen:
This letter is written to explain the drainage and grading plan for the "Cliff Minor Subdivision"
located at 511. E. Prospect St. As we have discussed this project involves the separation of one lot
from a existing parcel of land that has an existing dwelling. On this newly created lot a small single
family dwelling will be constructed. I have carefully considered the effect that this project will have on
storm drainage and have concluded that it will not adversely affect either quantity or quality of storm
water drainage from the site either to the public right of way or to adjoining properties. I am basing this
conclusion on the following;
1. The overall net change of impervious area after exiting impervious structures are
removed and the new structures are added is well under the 350 sq. ft standard stated in
the, City of Fort Collins, Storm Drainage Design Criteria and Construction Standards
manual. These changes are detailed in a table included on the drainage and grading
plan.
2. Much of the impervious area that is to be removed as well as large areas of marginally
pervious (run off coefficient of greater than 0.5) packed dirt drive way, parking, and dog
run areas will be replaced by plantings reducing run off while greatly improving water
quality.
3. The natural drainage of the site will be maintained with a gentle slope to Prospect Street
with any possible existing off site flow from the western adjoining property being very
minor due to the existing grades including a very slight west to east grade of Prospect St.
and the position of neighboring drive way close to the property line. Flows from the
existing lot on to the lot adjoining to the east are similarly limited due the existing grades
and the placement of the existing drive. This condition will be maintained or improved in
all cases by the proposed construction.
4. The existing dirt driveway and the new driveway will be improved with the addition of
gravel improving water quality by providing a gravel lined swale for exiting flows.