HomeMy WebLinkAboutFRONT PORCH PROPERTY, 1234 W. PROSPECT ROAD - FDP - 5-06/A - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE REPORTEXISTING
GRAVEL
202 S.F.
PROPOSED
IMPERVIOUS
31287 S.F.
0. 10, so' Im.
OVERLAY SHOWING
PRE VS POST
PAVEMENT ADDED TO
GRAVEL AREAS =
21158 S.F.
( NET 50% INCREASE)
PAVEMENT ADDED
GRASS AREAS =
15153 S.F.
(100% INCREASE)
LGRAVEL TO BE
REMOVED = 529 S.F.
( NET 50% DECREASE)
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1234 W. Prospect - Post Project Impervious Computation
(For entire parcel of 40,256 S.F.)
Jim Sell Design, Inc.
2475 June 27. 2006 SGS
Note: Percentage Imperviousness Values from Table RO-3, UDFCD Vol. I
Sub -Basin
ID
Surface
Description
Percent
Impervious
Area
(sq ft
Area
ac
Total
Area
ac
Area
Weighted
Percent
Impervious
Site
Pavement
100
3,122
0.072
7.76
Concrete
100
1,032
0.024
2.56
Roof
90
1 1,818
0.042
1
1 4.52
Lawns
0
34,284
0.787
1
1 85.16
40,256
1 0.92
1 100.00
1 15
requesting relief from the requirement of having to provide detention for projects which propose
to add impervious improvements totaling more than 1,000 square feet.
a
Should you have questions or desire further clarification regarding this variance request please
feel free to contact our office at (970) 484-1921.
Sincerely,
JIM SELL DESIGN, INC. 0RE,
29739 _: •
t n '.Smith, PE (9 -A7<a(o
P.E.#29739
Senior Project Engineer
J•
September 30, 2004 - Appendices
D
June 27, 2006
Ms. Shelby Sommer
Associate City Planner
City of Fort Collins Current Planning
281 North College Avenue
Fort Collins, CO, 80522-0580
RE: Front Porch Property Services
Property at 1234 West Prospect Road
Site Improvement Proposal
Addendum to Drainage Evaluation Letter
Dear Ms. Shelby:
LANDSCAPE ARCHITECTURE
PLANNING
ENGINEERING
GRAPHIC DESIGN
As requested by the City Engineering Department, I am providing a more detailed breakdown,
along with an exhibit, on the addition of impervious surfacing (i.e. pavement, concrete) for the
above referenced project as well as additional information with regards to the proposed
percentage imperviousness for the entire property.
■ The proposed, impervious surfacing over existing gravel totals 2,158• square feet. This
results in a net addition (at 50%) of 1.079 square feet. `
■ The proposed impervious surfacing over existing grass totals 1,153. square feet. This
results in a net addition (at 100%) of 1,153 square feet.
• The proposed removal of gravel, to be replaced by grass, totals 529 square feet. This
results in a net reduction (at 50%) of 264 square feet:
Therefore, the total additional` impervious area added to the site is 1,968 square feet
(1,079+1,153-264).
In summary, the Front Porch Property Services proposed improvements will add more than
1,000 square feet (net) of impervious area to the property. The resulting composite percentage
imperviousness for the entire parcel is' 15 percent. The Master Plan Study Basin for which this
site is located, Basin 42, is 70 percent impervious (this information provided by Mr. Wes
Lamarque of the City of Fort Collins. Stormwater-Water-Wasterwater Department). Therefore, it
can be concluded, that the additional impervious, areas will not result in a composite
imperviousness greater than the Master Plan. In addition, it is my belief that the increase in
runoff rate and volume will not negatively impact adjacent property owners due to the proposed
runoff patterns, which are directly to the Prospect Road right-of-way. Therefore, I am hereby
153 WEST MOUNTAIN AVENUE FORT COLLINS, COLORADO 80524 P970.484.1921 F970.484.24�?j�1 0 JIMS�F, I_sF.i�IG�y f�M.�w�M�r; !.LDESIGN.COM