HomeMy WebLinkAboutDrainage Reports - 04/04/1994April 4, 1994
Project No: 1161-11-93
Glen Schlueter, Civil Engineer
City of Fort Collins Stonn Water Utility
P.O. Box580
Ft. Collins, Colorado 80522
Re: DRAINAGE AND EROSION CONTROL REPORT
310 Whedbee Street P.U.D.; Fort Collins, Colorado
Dear Glen,
310 Whedbee Street P.U.D. consists of the proposed construction of a 1,280 square foot three car
garage with two (2) bedroom living unit above. The lot is a 50' wide by 190' deep lot (9,500
square feet; 0.218 acre) site located within the Old Town Drainage Basin. There is an existing
1,186 square foot (0.027 acre) residence situated near the front, or west side of the lot, with
several outbuildings which have been identified as two (2) garages and one (1) shed. TI1e
garage/apartment unit will take the place of the two (2) existing garage/shed units which will be
removed from the site. TI1ere will also be a certain amount of concrete removal to facilitate
construction of the unit, as well as new concrete drive and sidewalk adjacent to the proposed
garage.
DRAINAGE:
Re-development of this site would have absolutely no effect on the overall drainage impact
within the Old Town Basin. Detention ponding is not required. Our calculations indicate that
there will be essentially no increase in runoff due to the minor re-development of the site (See
attached runoff coefficient calculations).
EROSION CONTROL:
The required control security deposit will be $ 1,000.00. Erosion control security requirement
calculations are found on the attached estimate.
n erning this minor P.U.D. development, please call at 226-5334.
Brian W. Shear,
Shear Engineering Corporation
BWS/jmb
cc: Jeanne Sprague
4836 S. College, Suite 12 Fort Collins, CO 80525 (303)226-5334
April 4, 1994
Project No: 1161-11-93
Re: EROSION CONTROL SECURITY DEPOSIT REQUIREMENTS
310 Whedbee Street P.U.D.; Fort Collins, Colorado
Erosion control deposits are typically figured based on 1.5 times the cost to install the approved
erosion control measures or 1.5 times the cost to vegetate the actual area disturbed by
construction, to dryland grasses. In no instance shall the amount of security be less that
$1,000.00.
* Erosion control during construction will consist of a limited amount of silt fencing placed at
the rear of the lot near the alley. Approximately 70.00 LF of silt fence is proposed. Based on
a lineal foot price of $ 6.00 per lineal foot for this quantity of silt fence (provided by Connell
Resources, 04/04/94), the estimated cost to install the silt fence is approximately$ 420.00.
* Based on the most current cost data for revegetation provided by the Stonn Water Utility and
based on an actual anticipated net affected area of approximately 0.05 acre, we estimate that
the cost to revegetate the affected area will be$ 48.75 (1.5 x $ 650.00 / acre x 0.05 acre).
The security deposit required for this project is$ 1,000.00.
310 Whedbee Sfreet P.U.D.
Preliminary / Final Submittal
...
File: PEILCONS \ WHEDBEE\ PLANNING
310 WHEDBEE STREET P.U.D.
FORT COLLINS, COLORADO
Runoff Coeffecient for proposed conditions
LAND USE BREAKDOWN: (Proposed)
DESCRIPTION AREA(SF)
Gross Lot Area 9,500 SF
Building coverage
Residence* 1,186 SF
Garage / Apartment ** 1,280 SF
Shed 85 SF
Subtotal (Buildings) 2,551 SF
Parking and drives *** 640SF
Other concrete flatwork 904SF
Lawn and landscaping 5,405 SF
Totals: 9,500 SF
*
**
3 -bedroom residence
2 bedroom apartment
*** Offstreet parking: Garage
Driveway
Total
AREA ( acres)
3
~
6
0.218 acre
0.027 acre
0.029 acre
0.002 acre
0.058 acre
0.015 acre
0.021 acre
0.124 acre
0.218 acre
C2 = 0.058 (0.95) + 0.036 (0.95) + 0.124 (0.20) = 0.52
0.218
%COVERAGE
100.00 %
12.48 %
13.47 %
0.90%
26.85 %
6.74%
9.52 %
56.89 %
100.00 %
Project No: 1161-ll-93
Date: 04/04/94