HomeMy WebLinkAboutSite Certifications - 05/23/2005c -
1630 S. a _AM
5W ( rd, e0 0521
(970) 493-MOff
;W (910) 495- 9735
1May 23, 2005
Project No. 0179
Mr. Basil Hamdan
City of Fort Collins
Stormwater Utility Department
'700 Wood St.
Fort Collins, CO 80524
Dear Mr. Hamdan:
Our client has requested An alteration to the detention pond at Bighorn .Village II. The owner
wants to move the property line because the layout of the site has changed since'the original design.
The property line will be straightened, while keeping the pond on one side of the property line.
In the re -design of the detention pond, there were mimr changes to the volume and the water
_surface elevation. of the pond. The existing volume is 48,373 cubic feet and the proposed volume is
50,943 cubic feet. The proposed volume is within the required volume of 37,450 cubic feet.
Originally; the water surface elevation was designed as 5027.37 feet. The proposed water surface
elevation is 5027.25 feet.. Because the proposed 100 year, water surface depth is .less than existing, we
are recommending leaving the orifice plate as installed. If yo �y�ny questions or comments, please
contact us at your convenience. 01
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Sincerely, A400a�s r�aaociated, Sou. =
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%s��NAL
Lindsey Smith James R. Loonan, P.E.
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BIGHORN VILLAGE II.
Existins Detention Pond Volumes = POND A
Delta. Volume=(D/3)(AI+A2+SQR— T-(A1A2))
ELEV
AREA
DELTA
VOLUME
VOLUME
_-
-- FT
FT'
FT3
PT'
5023.55
0
0
0
5024
1196.96
180
180
5025
9646.61
4147
. 4,927
5026
13326.88 -
11437
16,364 .
5027
15782.58'
14537
30,001
5028
19217.32
17472
4$,V3
Required Volume =
37450-
Fe
W.S..Elevation =
E1eyn - Elev27
(Vo1R
-VOl2!)+Elevi7
V0128 - VO1277
5027.37
FT
100-year Depth (D)..=
3.82
FT
ELEV
AREA
-- - -
DELTA VOLUME
-
VOLUME
F'f
FT2
FT3
F,I'3
5023.55
0
0
5024
1196.96
180
180
5025
10212.84
4069
5148
5026
14342.42
12219
1,7,368
5027
16741.4
15526
32,804
5028
19389.12'..
48049
Required Volume =.
37450
FT3
W.S. Elevation =
Elev2g - E-1ev27
(VolR94w d-Vo12j)+EleV27
Vo128 - Vo127
=
5027115
Fr
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3.70 1FT
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