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• BE Y O N D E N G IN E E R ING
July 20, 2001
FC0067
Basil Hamdan
City of Fort Collins Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
SUBJECT: RE: Mini Mart P.U.D. - Proposed 5' Type 'R' Inlet
Dear Basil:
The following drainage letter and attached calculations detail the drainage improvements associated with the
Mini Mart P.U.D.
The proposed drainage improvements include a 5' Type `R' inlet along the north curbline of Willox Lane and
approximately 84 I.f. of 12" RCP that will connect the existing curb inlet on the east flowline of Willox Court
to the existing 24" RCP outfall. At the direction of the City of Fort Collins Stormwater Utility, the existing
curb inlet will be replaced with a 5' Type `R' Curb Inlet. A drainage study was not completed to substantiate
the size of the replacement inlet and the 12" RCP connection to the existing 24" RCP.
Figure 1. Shows the developed tributary area (i.e., Basin 1000). The actual (calculated) capacity of the inlet is
4.4 cfs. This exceeds the 2-yr. (Q2=1.19 cfs) and 100-yr. (Q100=4.38 cfs) developed flow. In summary, the
proposed 5' inlet has sufficient capacity to accept developed runoff from Basin 1000.
I reviewed the approved Mini Mart final drainage report and found that none of the information contained
within the report was relevant to our current work. In addition, an effort was made to learn something about
the capacity of the storm drain system that we were proposing to release into. According to you, the proposed
system is plagued by problems that limit the capacity of the system. In brief, you were comfortable with
whatever flow that we were proposing to the release into the system.
If you have any further questions, please contact me at 419-1340.
Sincerely,
Nolte Associates, Inc.
Herman Feissner, E.I.T.
NOLTE ASSOCIATES, INC.
1901 SHARP POINT DRIVE, SUITE A
FORT COLLINS, CO 80525
970.221.2400 TEL 970.221.2415 FAX
WWW.NOLTE.COM
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970a2L2400 TEL no.atsga PAX vN TsOou PREPARED FOR: Mini Mart DATE SUBMITTED: 06/21/01