HomeMy WebLinkAboutSite Certifications - 05/22/1995STRUCTURED ENGINEERING
318 East Oak Street
Fort Collins, CO 80524
(970)495-0810
May 12, 1995
Mr. Basil Hamdan '�_ I22/5am
City of Fort Collins l
Stormwater Utility
P.O. Box 580 �J
Fort Collins, CO 80522c5 C" c3
Dear Basil, (/� w � ` wGed,
'0
This letter is to verify that all concrete drain pans have been constructed for
Greenbriar Village 2nd Filing. As -built information on the pans indicate the will function
as designed. In most cases, grades are at or greater than called for on the construction
drawings. In a few instances, grades were found to be less than proposed on the
drawings, but a review of those areas indicate slope is still adequate to convey the design oyr°
100yr flows within the appropriate easements.
Calculations confirming this are included with this letter, as are blueline copies of
sheets 4 and 4-A of the construction drawings. The bluelines have been redlined to show
as -built elevations according to an as -built field survey.
Final grading has not been completed to date. This includes miscellaneous clean-
up work, and final grading to the edges of the retention on the east side of Redwood
Street.
Please let me know if there is anything else you need from me.
Fry Truly Yours,
seph P. Marcisofsky, P.E.
Structured Engineering
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PAN IN CHANNEL FLOWS t#(6®
TO DETERMINE "Q" ASSOCIATED WITH A GIVEN DEPTH (>2") @4:1
0=(1.486/n)[(A/P)'2/3]A(s`1 /2)
DETERMINE COMPOSITE n VALUE n GRASS= 0.035
n CONCRETE= 0.016
GIVE (> 2'): "i's'?'?0ja. 0.625333
GIVE s%: 054
FIND A=:
FIND P=:
FIND R=:
FIND COMP n=:
THEN Q=:
V=:
WIDTH=:
2.975
7.003
0.425
0.030
6.21 Cfs
2.09 fps
7.00 ft
M
GREENBRIAR 2nd FILING
DRAIN PAN
REVIEW
PAN IN CHANNEL FLOWS C #E58[ii
TO DETERMINE "Q" ASSOCIATED WITH A GIVEN DEPTH (>2") @4:1
DETERMINE COMPOSITE n VALUE n.GRASS=
nCONCRETE=
GIVE d (>= 2'):
1-79; 0.625333.
GIVE s%:
Q5
FIND A=:
2.975
FIND P=:
7.003
FIND R=:
0.425
FIND COMP n=:
0.030
THEN Q=:
5.97 cfs
V=:
2.01 fps
WIDTH=:
7.00 It
0:035
0.016
GREENBRIAR 2nd FILING
DRAIN PAN
REVIEW
PAN IN CHANNEL FLOWS
TO DETERMINE "Q"ASSOCIATED WITH A GIVEN DEPTH (>2') @41
Q=(1.486/n)[(A/P)*213]A(s*1/2)
DETERMINE COMPOSITE n VALUE n GRASS=
n CONCRETE=
GIVE d (>= 2'):
0-J9, 0.625333
GIVE s%:
V::: ... * -.47.1
FIND A=:
2.975
FIND P=:
7.003
FIND R=:
0.425
FIND COMP n=:
0.030
THEN Q=:
5.79 cfs
V=:
1.95 fps
WIDTH=:
7.00 ft
0.035
0.016
GREENBRIAR 2nd FILING
DRAIN PAN
REVIEW
PAN IN CHANNEL FLOWS
TO DETERMINE "Q" ASSOCIATED WITH A GIVEN DEPTH (>2") @4:1
0=(1.486/n)[(A/P)*2/3]A(s*1/2)
DETERMINE COMPOSITE n VALUE n GRASS=
n CONCRETE=
GIVE d (>= 2'1: 0.625333
GIVE s%:
FIND A=:
2.975
FIND P=:
7.003
FIND R=:
0.425
FIND COMP n=:
0.030
THEN Q=:
6.07 cfs
V=:
1.70 fps
WIDTH=:
7.00 ft
0.035
0.016
GREENBRIAR 2nd FILING
DRAIN PAN
REVIEW
PAN IN CHANNEL FLOWS
TO DETERMINE "Q" ASSOCIATED WITH A GIVEN DEPTH (>2") @41
Q=(1.486/n)[(A/P)-2/3]A(s'1/2)
DETERMINE COMPOSITE n VALUE n GRASS=
n CONCRETE=
GIVE d (>= 2'):
1.000333
GIVE s%:
039
FIND A=:
6.163
FIND P=:
10.003
FIND R=:
0.616
FIND COMP n=:
0.031
THEN Q=:
13.27 cfs
V--:
2.15 fps
WIDTH=:
10.00 It
0.035
0.016
1h
GREENBRIAR 2nd FILING
DRAIN PAN
REVIEW
PAN IN CHANNEL FLOWS
TO DETERMINE "Q" ASSOCIATED WITH A GIVEN DEPTH (>2") @4:1
0=(1.486/n)[(A/P)'2/3]A(s'1 /2)
DETERMINE COMPOSITE n VALUE n GRASS= 0.035
n CONCRETE= 0.016
GIVE d (>= 2'D:
t 1.250333
GIVE s%:
04ra'
FIND A=:
8.914 .
FIND P=:
12.003
FIND R=:
0.743
FIND COMP n=:
0.032
THEN Q=:
22.89 cfs
V=:
2.57 fps
WIDTH=:
12.00 ft