HomeMy WebLinkAboutBUCKING HORSE FILING FOUR - PDP - PDP150026 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTNovember 18, 2015
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
RE: Drainage Summary Letter for
Bucking Horse Filing 4
Dear Staff:
Northern Engineering is pleased to submit this Drainage Summary Letter in support of the
proposed Bucking Horse Filing 4 project for your review. The Filing 4 project involves the
anticipated build-out of a portion of the overall Bucking Horse development with an apartment
complex. The proposed apartment complex area was anticipated in earlier submittals related
to the Bucking Horse development, and was incorporated in the SWMM model reviewed and
approved with the Bucking Horse Filing 2 project (“Final Drainage Report for Bucking Horse
Filing 2”, December 17, 2012, by Northern Engineering).
The proposed Filing 4 project will modify basin percentage imperviousness for SWMM Basin
105 as identified in the original Filing 2 report and modeling efforts. This previously approved
SWMM model showed this basin with a percent impervious value of 75%. With the proposed
site plan for Bucking Horse Filing 4, the averaged percent impervious value will be reduced
siginificantly, from 75% down to 56%. This will be beneficial for the storm system design and
detention pond design by creating a small decrease in both peak 100-year runoff rates and
volumes. Runoff patterns and main points of discharge will not deviate from what was
anticipated with the layout of the overall Bucking Horse development and the master planning
done with Bucking Horse Filing 2.
If you should have any questions as you review this, please feel free to contact us.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Aaron Cvar, PhD, PE
Senior Project Engineer