HomeMy WebLinkAboutHARMONY VILLAGE PUD - PRELIMINARY - 65-93C - CORRESPONDENCE - Stormwater Related DocumentsMr. Basil Hamdan
October 19, 1998
Page 2
for use as a detention area and a drainage easement was dedicated on the Final Plat for Harmony
Crossing P.U.D.
We appreciate your time and consideration in reviewing these points. If you have any questions
or comments, or need additional information, please do not hesitate to contact us. Thank you.
Sincerely,
A ENGINEERING, LTD.
Reviewed by,
David W. Klockeman, .E.
Project Manager
cc: Ty Fangman, Dial Properties
Linda Ripley, VF Ripley Associates
Ted Shepard, City of Fort Collins Current Planning Department
JREngineering, L
2620 East Prospect Rd. Suite 190
Fort Collins, Colorado 80525
(970) 491-9888 • FAX (970) 491-9984
www.jreng.com
October 19, 1998
Mr. Basil Hamdan
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, CO 80521
RE: Preliminary Approval for Harmony Village P.U.D.
Dear Basil:
Sh-� uhao
This letter is in response to our meeting on August 28, 1998 regarding approval of preliminary
plans for Harmony Village P.U.D. As discussed in this meeting, two items need to be addressed
before final construction plans are submitted. The first is the runoff "C" coefficients and percent
impervious values that were used in the storm water runoff calculations and the SWMM model.
The second was determining if off -site runoff would be blocked by the Harmony Village
development, and if any off -site grading was necessary on the west side of the property adjacent
to the existing warehouse.
We have reevaluated the percent impervious value for the entire site and found that 67 percent
impervious is more realistic than the 65 percent impervious that was used in the Preliminary
Drainage Report. This value along with a revised basin width and an updated storage -discharge
curve for the proposed detention pond was incorporated into the most recent SWMM input file
for the McClellands Basin, which was obtained from your office. The results of the SWMM run
indicate that there would be no negative downstream impacts from the development of Harmony
Village P.U.D. With the final drainage report, runoff "C" coefficients will be calculated for each
subbasin based on the relative areas of parking, building, landscape etc. Final design for the
storm drainage system including pipes, inlets and swales will reflect these updated "C" values.
Runoff from the warehouse property will not be blocked by the Harmony Village P.U.D.
Stormwater runoff from the warehouse site will continue to flow to the south and west along the
warehouse property line to outfall onto the railroad as it has done historically. A concrete trickle
pan and culvert pipe will be installed on the Harmony Village property as these flows currently
enter our site in route to the railroad property.
No off -site grading is required in this area. Off -site grading will be required in the southeast
corner of the Harmony Village property for the proposed detention pond. This area was intended
4935 North 30th Street 6020 Greenwood Plaza Blvd. 704 Fortino Blvd. West
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