HomeMy WebLinkAboutFOX GROVE ODP - ODP130003 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT1
Overall Drainage Report
Date: August 7, 2013
Project: Fox Grove
Overall Development Plan
Fort Collins, Colorado
Attn: Mr. Wes Lamarque
Fort Collins Utilities
700 Wood Street
Fort Collins, Colorado 80524
Mr. Lamarque:
This letter report accompanies the submittal for the Fox Grove Overall Development Plan
(ODP). Specifically, this letter report serves to document the overall drainage impacts
associated with the proposed Fox Grove Development.
The proposed development site is located southeast of the I-25/Mulberry (State Highway 14)
interchange in Fort Collins, Colorado. The site is situated along the existing I-25 east frontage
road, just south of the existing Interchange Business Park development.
The overall Fox Grove site is roughly 36 acres in size. A portion of the site is encroached by the
FEMA regulatory Boxelder Creek 100-year Floodplain per FEMA Map Number 08069C1003G,
dated May 2, 2012. Accordingly, the site design must satisfy the standards of Chapter 10 of City
Code.
The proposed development site is in the City of Fort Collins Boxelder Creek Basin. Detention
requirements for this basin are to detain the difference between the 100-year developed inflow
rate and the historic 2-year release rate. However, if it can be shown by basin modeling that
undetained flows from the developed site would result in no increase in peak discharge within
Boxelder Creek, the detention requirement would be waived. No modeling has been done at
the present, but may be considered as this project progresses. The current submittal does
show proposed on-site detention.
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Previous submittals for the Fox Grove site are briefly described below:
CLOMR Request for Lee MLD, Northern Engineering, September 2007. This CLOMR
was submitted to FEMA in 2007 and approved in November 2008. The proposed work
shown with the CLOMR included both Lot 1 (west of Boxelder Creek) and Lot 2 (east of
Boxelder Creek) of Lee MLD. The CLOMR included proposed grading along the east bank
of Boxelder Creek, and proposed revisions to the regulatory floodplain and floodway.
Due to land development market conditions at the time of the CLOMR, the project was
placed on hold. The project did not move to construction, and no LOMR was submitted
for the project.
The proposed Fox Grove site will drain into on-site detention ponds which will release into the
Boxelder Creek, located just west of the site. We do not currently propose any release to the
east. All water quality treatment requirements and LID requirements will be satisfied with the
proposed development. Means of providing for these requirements will be worked through at
the Preliminary and Final stages of the design process.
In summary, this Overall Drainage Report letter adequately addresses any potential stormwater
changes associated with the proposed development. In general, there are no significant
changes proposed at a major drainage level. The ODP complies with the governing City of Fort
Collins Master Drainage Plans, and the previously approved drainage plans specific for the
subject property.
Please feel free to contact me with any questions you may have.
Sincerely
NORTHERN ENGINEERING
Aaron Cvar, PE
Project Engineer