HomeMy WebLinkAboutTHE MISSION (CATHOLIC COMM. CHARITY) - R-C SITE PLAN REVIEW - 3-97 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT4';
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calculation sheet from 1988 Drainage Report). Using a new weighted
'cw' value of .60 to calculate the storm watershed results in the
following;
10-year storm - Q = 2.7 cfs
100-year storm - Q = 5.4 cis
As you can see these are insignificant amounts. That and the
fact that Catholic Community Services has a standing agreement with
the ditch company to allow undetained offsite flow (see Agreement
dated 6-20-88 in City file for this subdivision), we feel it is
unnecessary to detain any runoff.
Thank you for your cooperation in this matter. If you or
anyone in your office has any questions regarding this manner,
please don't hesitate to call.
Respectfully,
CDS ENGINEERING CORPORATION
rgnKevin E. Forbes, E.I.T.
KEF/pkW
January 15, 1997
Glen Schlueter
City of Fort Collins
Stormwater Utility
235 Mathews
Fort Collins, CO 80524
RE: Drainages Calculations
Catholic Community Services
CDS Project No. 96-8896
Dear Mr. Schlueter,
This letter is in- regards to our conversation on January 13,
1997. At that time we discussed the drainage concerns of the
Catholic Community Services Addition to their existing building.
This new structure is attached to the Northwest corner -of the
existing structure and covers approximately 880 sq ft. Along with
the proposed addition there will be four parking stalls to serve
the building. These will be located on the north side of the
existing service drive (see the attached drawing for these
locations).
As I previously mentioned, we have changed the existing
permeability of the total site by less than four percent. Using
the Equation Detention Method this change would equate to a
detention volume of 0032 ac-ft for a 100-year storm and 017 ac-
fj for a 10-year storm (see attached detention calculation sheet).
The developed runoff values for this site has been previously
calculated to be 5.0 cubic feet per second for a 100-year storm and
2.5 cubic feet per second for a 10-year storm (see attached
165 2nd Street S.W, 9 Loveland, C0 80537 . (970)667-8010 . Fax: (970) 667-8024