HomeMy WebLinkAboutDrainage Reports - 01/08/2019City of Fort Collins Approved Plans
Approved by:
Date:
Dan Mogen
01/08/2019
PROJECT NAME Union Place
PROJECT NUMBER U13003
Area (acres) C100*Area %I Comments
11.25 7.12 49%
TOTAL,11.25 7.12 49%
Ave C100 = 0.63
Qout (cfs) =2.19 0.1931 cfs/acre Tc (min) =30
Rainfall
Intensity Inflow Volume
Adjustment
Factor
Average
Outflow Rate
Outflow
Volume
Required Storage
Volume
I Vi=(Qin*T*60) m= 0.5(1 + Tc/T) Qav = m*Qout Vo=Qav*T *60 Vs=Vi-Vo
min in/hr cfs ft 3 cfs ft 3 ft 3
5 9.95 70.84 21,253 1.00 2.19 657 20,596
10 7.72 54.97 32,980 1.00 2.19 1,314 31,666
15 6.52 46.42 41,780 1.00 2.19 1,971 39,809
20 5.60 39.87 47,846 1.00 2.19 2,628 45,218
25 4.98 35.46 53,186 1.00 2.19 3,285 49,901
30 4.52 32.18 57,928 1.00 2.19 3,942 53,986
35 4.08 29.05 61,004 0.93 2.04 4,276 56,729
40 3.74 26.63 63,909 0.88 1.92 4,604 59,305
45 3.46 24.64 66,515 0.83 1.83 4,933 61,582
50 3.23 23.00 68,993 0.80 1.75 5,261 63,732
55 3.03 21.57 71,193 0.77 1.69 5,590 65,603
60 2.86 20.36 73,308 0.75 1.64 5,918 67,389
70 2.59 18.44 77,451 0.71 1.57 6,575 70,876
80 2.39 17.02 81,681 0.69 1.51 7,232 74,448
90 2.23 15.88 85,739 0.67 1.46 7,889 77,850
100 2.08 14.81 88,858 0.65 1.42 8,546 80,311
110 1.96 13.96 92,104 0.64 1.39 9,203 82,901
120 1.83 13.03 93,813 0.63 1.37 9,860 83,953
Max Volume,ft 3 =83,953 =1.93 acre-ft
Area
acres
J1 0.20 0.17 86%
J2 0.26 0.21 81%
H 0.17 0.14 84%
G1 0.41 0.29 71%
E4 1.21 0.84 69%
TOTAL 2.24 1.65 74%Total to Detention Pond requiring WQ in EDB
% I = 74%
Time=40 hours, from Figure SQ-2, WQCV =0.29 watershed inches
Net Required Storage = (WQCV/12)*Area*1.2 = 2,852 ft 3 =0.07 acre-ft
Total required Volume, without individual WQ and smaller detention =86,805 ft 3 =1.99 acre-ft
Detention Provided in Pond C1*-1,499 ft 3 =-0.03 acre-ft
Detention Provided Under Porous Pavement in C2*-2,303 ft 3 =-0.05 acre-ft
Detention Provided Under Porous Pavement in A3*-1,768 ft 3 =-0.04 acre-ft
Detention Provided Under Porous Pavement in D*-3,133 ft 3 =-0.07 acre-ft
*Required Detention Volume no longer reduced for these upstream storage volumes
Total Required Volume = 86,805 ft 3 =1.99 acre-ft
Delta Volume = (d/3)(A1+A2+(A1*A2)
0.5)
Basin P1 Basin P2 Basin P3 Total
Elevation d Delta Volume
ft ft ft 2 ft 2 ft 2 ft 2 ft 3 ft 3 acre-ft
4976.8
4978.76 0 41,100 17,777 32 58,909 0 0 0.00
4979.00 0.24 43,557 18,539 508 62,604 14579 14,579 0.33
4980.00 1.00 49,283 22,088 2,983 74,354 68395 82,974 1.90
4981.00 1.00 54,350 30,813 85,163 79697 162,672 3.73
4981.30 0.30 55,866 32,727 88,593 26062 188,733 4.33
4982.30
Elev81 - Elev80 (VolRequired-Vol80)+Elev80 Calculated Volume at outlet wall spill
Vol81 - Vo80
W.S. Elevation,ft =4980.05 W.S. Elevation, ft =4980.10
100-year Depth D,ft =1.29 from elevation 4978.76 Volume (ft^3) =90943.89
100-year Depth D,ft =3.25 from elevation 4976.8 Volume (acre-ft) =2.09
Top-of-Berm,ft =4982.30
Freeboard ,ft =2.25
Elevation Area
Top of Berm
Bottom of Regional Pond
Detention Pond Volume and Depth (provided above elevation 4978.76)
%I*A
Detention Pond Calculations - POND P
Assume WQ needs to be provided in the extended detention basin for the basins given below. Other basins direct flow to porous pavements, infiltration swales,
bioretention, flat bottom ponds or a combination and therefore WQ is provided in these features.
Required Detention Pond Volume
W.S. Elevation, ft =
Total Required Detention Pond Volume
Note: The initial elevation 4978.76 was based on the invert of the existing outlet pipe. This would have been bottom elevation for Pond P1 if temporary retention was not present. The
volumes shown above have been revised from the original report and are based off of as-built survey information.
Qin=
100*Area*I
Rainfall Duration
(T)
Cumulative Volume
A-M
Basin
Water Quality
%I
Copy of U13003-Runoff_Pond Calcs for revised outlet2.xls, pond P
12/7/2018,3:02 PM
PROJECT NAME Union Place
PROJECT NUMBER U13003
Detention Pond Calculations - POND P
Orifice Flow Rate, Q (cfs) =CoAo(2gHo)0.5 Area of orifice Ao, ft
2 =Q
Co = 0.6 Co(2gHo)0.5
Q = Qout of pond,cfs =2.19
gravitational acceleration g,ft/sec 2 =32.2
average weighted diam of 6" and 7" outlet,ft =0.65
Effective head on orifice Ho = D-1/2diam,ft =0.96 At elevation 4978.76
Area of orifice Ao,ft 2 = 0.46
Area of orifice Ao,in 2 = 66.76 (Equivalent to 7" diam opening and 6" diam opening)
Delta Volume = (d/3)(A1+A2+(A1*A2)
0.5)
Scenario #1 - Does not include basin P3
Basin P1 Basin P2 Basin P3 Total
Elevation d Delta Volume
ft ft ft 2 ft 2 ft 2 ft 2 ft 3 ft 3 acre-ft
4976.8 0 1 1 0 0 0.00
4977.0 0.2 15 882 897 62 62 0.00
4978.0 1 30,216 15,327 45,543 17611 17,672 0.41
4978.76 0.76 41,100 17,777 58,877 39571 57,244 1.31
4979.0 0.24 43,557 18,539 62,096 14515 71,759 1.65
4980.0 1 49,283 22,088 71,371 66680 138,438 3.18
4981.0 1 54,350 30,813 85,163 78166 216,604 4.97
4981.3 0.3 55,866 32,727 88,593 26062 242,666 5.57
Scenario #2 - Does include basin P3
Basin P1 Basin P2 Basin P3 Total
Elevation d Delta Volume
ft ft ft 2 ft 2 ft 2 ft 2 ft 3 ft 3 acre-ft
4976.8 0 0 0 0 0.00
4977.0 0.2 15 882 897 60 60 0.00
4978.0 1 30,216 15,327 0 45,543 17611 17,670 0.41
4978.76 0.76 41,100 17,777 32 58,909 39583 57,253 1.31
4979.0 0.24 43,557 18,539 508 62,604 14579 71,833 1.65
4980.0 1 49,283 22,088 2,983 74,354 68395 140,227 3.22
4981.0 1 54,350 30,813 85,163 79697 219,925 5.05
4981.3 0.3 55,866 32,727 88,593 26062 245,986 5.65
Elevation Area
Elevation Area
Note: The volumes shown above have been revised from the original report and are based off of as-built survey information.
Regional Detention Pond Volume and Depth (provided above elevation 4976.8)
Orifice Opening
Cumulative Volume
Cumulative Volume
Copy of U13003-Runoff_Pond Calcs for revised outlet2.xls, pond P
12/7/2018,3:02 PM
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PREPARED FOR:DATE SUBMITTED:
The engineer preparing these plans will not be responsible for, or
liable for, unauthorized changes to or uses of these plans. All
changes to the plans must be in writing and must be approved by
the preparer of these plans.REVIVE PROPERTIES LLC 12/7/2018
UNION PLACE
PREPARED FOR:DATE SUBMITTED:
The engineer preparing these plans will not be responsible for, or
liable for, unauthorized changes to or uses of these plans. All
changes to the plans must be in writing and must be approved by
the preparer of these plans.CA
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UNION PLACE
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