HomeMy WebLinkAboutJ.L. WEST (726 S. LEMAY AVE.) - PDP - 39-99 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTINovember 3, 1999
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
Mr. Basil Hamdan
Fort Collins Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
' Dear Basil,
1 RE: Addendum To J.L. West
The owners of the J.L. West site which is on the Southeast corner of Riverside Avenue and
' Lemay Avenue are planning on constructing a Domino's Pizza Restaurant along with the existing use
which is now a drive-thru Wok & Roll Teriyaki. The Domino's site will be on the South side of the
site.
All of the proposed construction and reused parking areas are in the developed Subbasin `B"
as defined in the original report. The basin area is 0.84 acres and has a release rate of 0.9 c.f.s. as
1 shown in the original report. The release rate is not the two -year -historic rate but a reduced rate due
to undetained 100-year flows from this site.
I recalculated the C valve for Subbasin `B" due to the difference of hard surface area. This
new site has 977 sf more hard surface area than the original site. Therefore, the revised C-100 valve .
is 0.79 compared to 0.76 before. Using the 1999 City Intensity table and the new C-100 valve I
calculated QZ 2.38cfs and Q,00 -6.24 c.f.s.. Originally they were QZ 2.43 c.f.s. and Q,00 4.89 c.f.s..
With the new data the required detention volume is now 3,777.7 cubic feet. The 100-year
high water line is 56.97 feet. The new orifice size is 2.49 inches. A restriction plate will be required
on the pipe outlet of the new area inlet.
The spillway for this site is the new 24" foot wide driveway to Lemay Avenue.
The required Erosion Control Escrow amount for the site is $1035.
If you have any questions or need any more information with respect to this site please let me
know.
Si, erely,
° .Vl
Franklin
FDB/meh
James H. Stewart
and Associates, Inc. .
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
T�.
ADDENDUM TO
THE FINAL STORM DRAINAGE REPORT
FOR
J.L. WEST
NOVEMBER 3, 1999
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
TEL. 970-482-9331
FAX. 970-482-9382