HomeMy WebLinkAboutDrainage Reports - 10/04/1983Jarnss H. , evvart and Associates, In
Consulting Engineers and Surveyors
Laboratory
214 North Howes Street 301 Lincoln Court
P.O. Box 429 P.O. Box 429
Fort Collins, Colorado 80522 Fort Collins, Colorado 80522
(303) 482-9331 (303) 484 6209
DRAINAGE REPORT FOR THE COVE AT THE COUNTRY CLUB
The Cove at the Country Club is a proposed 1.84-acre residential planned
unit development on the Southeast shore of Long Pond Reservoir. The
site historically drains entirely into Long Pond and it is proposed to
continue this drainage pattern after development.
It is proposed to have the rear of Lots 4, 5, 6 & 7 drain directly into
Long Pond. The drainage from the rest of the P.U.D. would be collected
at an inlet in the cul-de-sac and discharge into Long Pond via a pro-
posed 15-inch R.C.P. storm drain. The storm drain will carry the entire
100-year developed runoff.
It is proposed by the developer to negotiate with Water Supply and
Storage Company to discharge the entire runoff into Long Pond without
detaining the runoff. The total quantity of storm water from a 100-
year storm is 13,040 cubic feet. This would raise the level of Long
Pond 0.02 inches, which can be considered insignificant.
The calculations of runoff for 2-year, 10-year, and 100-year storms
are enclosed.
SUBJECT �tffy y�.i/E_ 4z_%�_�a'1VJ�Lz� BY—_�1�. _ — OATE1oz�ld�
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----------------------- PROJECTNO.----------
AR CA = /,8�- Ac ES
Tc-
/.87 (/./— 0.5) 4�0 /L lS At;A)
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3 %a
TOTAc._ !��V.V OFF
ZyR, Hur, Q = 0,zo x 2./x /84- = 0,77 c,FS,
2yF. Dev. Q = 0.50 X z,l x /,8d. = /,73 c..FX.
/0yA. Dr.. Q = 0.5o x 3.75 x A84- = 3.4S c.F,S.
/00 y,e, Del. Q = a 50 x /• Z5 x 61.0 x /, a 4- = G, 40 e,As.
QUNOFP TO =hlLET OMLy
Zyp Dcv, Q= 0--so x a,/ x /,34- = /,¢/ C•F.S.
/0yp.. Dev. Q ` 0.50 x 3,75 x /.3it- = 2,5/ c,Ft,
/00 yr-, D5v, Q = 0,50 x /.25x &,,o x /.34- = S.02 c.Fs.
0S�- )5" )2. C, F S = 2,s870 Q = 8 c,is.
7o7-AL I�V/JOFF = 0,5 x /,7S x /OS x (00 X /80 y /.E4 = 13,040 cy.FT
/00 y,e.