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HomeMy WebLinkAboutDrainage Calculations -, ~ To: Jamie Shinneman Date: 10/12/05 Re: Weihe Engineers, Inc. 10505 North College Job.# w05.0417 As revised The following summaries are the results of the underground detention, minimizing the outlet to a six (6) in outlet. The consecutive analysis of the 42 inch vs. the 48 inch conduits, maintained the orifice invert for both sizes at the 837 elevation; and may need to be adjusted appropriately with the design. Maximizing the stage storage volume with a six (6) inch orifice outlet, the following is required: v'" 362' - 42 inch Orifice outlet = 6.00 inch Frequency Fluctuation Outflow Q2 838.31 ft 0.83 cfs QI0 839.01 ft 1.09 cfs QI00 840.46 ft 1.49 cfs v'" 258' - 48 inch Orifice outlet = 6.00 inch Frequency Fluctuation Outflow Q2 838.45 ft 0.89 cfs QI0 839.26 ft 1.1 7 cfs QI00 840.98 ft 1.63 cfs jo'b 10/12/05 H:\\w050417\w050417menoOll01205\~ Pond Report Hydraflow Hydrographs by InteIisolve Wednesday, Oct 12 2005,5:54 AM Pond No. 1 - Underground Detention Pond Data Pipe dia. = 3.50 ft Pipe length = 362.0 ft No. Barrels = 1.0 Slope = 0.00 % Invert elev. = 837.00 ft Stage I Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuff) Total storage (cuff) 0.00 837.00 00 0 0 0.18 837.18 00 65 65 0.35 837.35 00 116 181 0.53 837.53 00 146 328 0.70 837.70 00 169 496 0.88 837.88 00 185 682 1.05 838.05 00 198 879 1.23 838.23 00 208 1,087 1.40 838.40 00 214 1,301 1.58 838.58 00 220 1,521 1.75 838.75 00 221 1 ,742 . 1.93 838.93 00 221 1,963 2.10 839.10 00 220 2,183 2.28 839.28 00 215 2,398 2.45 839.45 00 207 2,605 2.63 839.63 00 198 2,803 2.80 839.80 00 185 2,988 2.97 '839.98 00 168 3,156 3.15 840.15 00 146 3,303 3.32 840.33 00 116 3,419 3.50 840.50 00 65 3,484 Culvert I Orifice Structures Weir Structures [A] [B] [C] [D] Rise (in) 12.00 6.00 0.00 0.00 Span (in) 12.00 6.00 0.00 0.00 No. Barrels 1 f 0 0 Invert EI. (ft) = 837.00 837.00 0.00 0.00 Length (ft) = 10.00 0.00 0.00 0.00 Slope (0/0) = 1.00 0.00 0.00 0.00 N..Value = .013 .013 .000 .000 - Orif. Coerr. = 0.60 0.60 0.00 0.00 Multi-Stage = n/a Yes No No [A] [8] [C] [D] C rest Len (ft) = 0.00 0.00 0.00 0.00 Cre~t EI. (ft) = 0.00 0.00 0.00 0.00 Weir Coeff. = 0.00 0.00 0.00 0.00 Weir Type Multi-Stage = No No No No E~iltration = 0.000 in/hr (Wet area) Tailwater Elev. = 0.00 ft Stage I Storage I Discharge Table Stage Storage Elevation CivA Clv B Clve Clv D WrA WrB \I\!r C WrD E~fi I Total ft cuff ft cfs cfs crs crs cis cfs cfs cfs cfs cfs 0.00 0 837.00 0.00 0.00 0.00 0.18 65 837. 1 8 0.07 0.07 0.07 0.35 . 181 837.35 0.24 0.24 0.24 0.53 328 837.53 0.42 0.42 0.42 0.70 496 837.70 0.54 0.53 0.53 0.88 682 837.88 0.63 0.63 0.63 1.05 879 838.05 0.73 0.71 0.71 1.23 1,087 838.23 0.80 0.79 0.79 1.40 1,301 838.40 0.87 0.87 0.87 1.58 1,521 838.58 0.94 0.94 0.94 1.75 1,742 838.75 1.00 1.00 1.00 1.93 1 ,963 838.93 1.07 1.06 1.06 2.10 2,183 839.10 1.12 1.12 1.12 2.28 2,398 839.28 1.19 1.18 1.18 2.45 2,605 839.45 1.23 1.23 1.23 2.63 2,803 839.63 1.29 1.28 1.28 2.80 2,988 839.80 1.33 1.33 1.33 2.97 3,156 839.98 1.38 1.38 1.38 3.15 3,303 840.15 1.42 1.42 1.42 3.32 3,419 840.33 1.46 1.46 1.46 3.50 3,484 840.50 1.49 1.49 1.49 Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. 1 Hydrograph Return Period Recap I '0 'd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph I. type Hyd{ 5) description ( origin) 1-Yr 2-Yr 3-Yr 5-Yr 10- Y r 25-Yr 50-Yr 100-Yr 1 Rational ------ 0.00 0.55 ---- 0.65 0.71 0.79 0.86 0.92 Existing East 2 Rational ----- 0.00 0.46 ------ 0.50 0.52 0.57 0.60 0.64 Existing Alley 3 Rational ------ 0.00 1.57 ----- 1.72 1.81 1.95 2.07 2.19 Existing West 4 Combine 1,2,3 0.00 2.38 --- 2.63 2.77 3.01 3.21 3.40 Total Combined 5 Rational ------- 0.00 3.97 ------ 4.34 4.56 4.93 5.23 5.54 Proposed Cond T c = 5 6 Rational ------ 0.00 2.05 ------- 2.56 2.89 3.38 3.73 4.08 Proposed Cond T c = 15 7 Rational ------ 0.00 1.34 ------- 1.73 1.99 2.38 2.67 2.97 Proposed Cond T c = 30 8 Rational ------ 0.00 0.88 ------ 1.13 1.32 1.56 1.76 1.96 Proposed Cond T c = 60 9 Rational ------ 0.00 0.58 ---- 0.73 0.85 0.98 1.09 1.20 Proposed Cond Tc = 120 10 Rational ------ 0.00 0.38 ------- 0.47 0.54 0.60 0.65 0.70 Proposed Cond T c = 240 11 Rational ----- 0.00 0.29 ------- 0.36 0.41 0.45 0.48 0.50 Proposed Cond T c = 360 12 Rational ------ 0.00 0.19 ------- 0.23 0.26 0.27 0.28 0.28 Proposed Cond T c = 720 13 Reservoir 5 0.00 0.74 ---- 0.77 0.79 0.83 0.86 0.88 Detention Route 14 Reservoir 6 0.00 0.78 ----- 0.90 0.96 1.06 1.12 1.19 Detention Route Reservoir 7 0.00 0.75 ----- 0.88 0.97 1.09 1.18 1.27 Detention Route J Reservoir 8 0.00 0.65 ------- 0.79 0.88 1.00 1.09 1.17 Detention Route 17 Reservoir 9 0.00 0.51 ------ 0.62 0.70 0.79 0.86 0.93 Detention Route 18 Reservoir 10 0.00 0.36 ---- 0.44 0.50 0.55 0.60 0.63 Detention Route 19 Reservoir 11 0.00 0.29 ------ 0.35 0.40 0.43 0.46 0.48 Detention Route 20 Reservoir 12 0.00 0.19 O.L,j : 0.26 D.LO 0.27 0.28 Detention Route ------ 21 Mod. Rational ------- 0.00 1.13 ------- 1.45 1.69 2.01 2.27 2.52 Proposed Cond Tc = 5 22 Reservoir 21 0.00 0.83 ------ 0.99 1.09 1.23 1.35 1.49 Detention Route 23 Mod. Rational ----- 0.00 1.17 ---- 1.51 1.75 2.09 2.36 2.62 Proposed Cond Tc = 15 24 Reservoir 23 0.00 0.80 ------ 0.95 1.05 1.18 1.29 1.40 Detention Route 25 Mod. Rational ------- 0.00 1.05 ------- 1.35 1.57 1.87 2.11 2.35 Proposed Cond T c = 30 26 Reservoir 25 0.00 0.75 ----- 0.90 0.99 1.12 1.22 1.32 Detention Route Proj. file: w050417ddff1 01205.GPW I Wednesday, Oct 12 2005, 5:54 AM 2 Hydrograph Summary Report I ~vd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph J. type flow interval peak hyd{ s) elevation storage descrj ption ( origin) ( cfs ) (min) (min) ( cuff) (ff) ( cuff) 1 Rational 0.55 1 8 265 - --- - Existing East 2 Rational 0.46 1 5 137 - - -- Existing Alley 3 Rational 1.57 1 5 472 -- ---- -- Existing West 4 Combine 2.38 1 5 874 112,3 -- ---- Total Combined 5 Rational 3.97 1 5 1,192 --- ---- --- Proposed Cond T c = 5 6 Rational 2.05 1 15 1,842 - ---- -- Proposed Cond T c = 15 7 Rational 1.34 1 30 2,417 -- --- --- Proposed Cond T c = 30 8 Rational 0.88 1 60 3, 168 --- -- ----- Proposed Cond T c = 60 9 Rational 0.58 1 120 4,150 --- --- --- Proposed Cond T c = 120 10 Rational 0.38 1 240 5,435 --- ----- ----- Proposed Cond Tc = 240 11 Rational 0.29 1 360 6,364 --- ---- ----- Proposed Cond T c = 360 12 Rational 0.19 1 720 8,333 - --- - Proposed Cond T c = 720 13 Reservoir 0.74 1 9 1, 185 5 838.1 0 942 Detention Route 14 Reservoir 0.78 1 24 1,835 6 838.20 1,058 Detention Route Reservoir 0.75 1 43 2,410 7 838. 12 964 Detention Route .0 Reservoir 0.65 1 76 3,161 8 837.92 730 Detention Route 17 Reservoir 0.51 1 135 4, 143 9 837.66 459 Detention Route 18 Reservoir 0.36 1 250 5,428 10 837.46 274 Detention Route 19 Reservoir 0.29 1 368 6,357 11 837.39 216 Detention Route 20 Reservoir 0.19 1 727 8,326 I ~2 837.31 I 153 Detention Route 21 Mod. Rational 1.13 1 0 2,704 -- ---- ----- Proposed Cond T c = 5 22 Reservoir 0.83 1 ..1."" 2,697 21 838.31 1: 192 Detention Route ' I 23 Mod. Rational 1.17 1 15 2,637 -- --- ----- Proposed Cond T c = 15 24 Reservoir 0.80 1 42 2,595 23 838.25 1,117 Detention Route 25 Mod. Rational 1.05 1 30 2,832 - --- --- Proposed Cond T c = 30 26 Reservoir 0.75 1 54 2,825 25 838.13 972 Detention Route w050417ddff101205.GPW Return Period: 2 Year Wednesday, Oct 12 2005,5:54 AM 3 Hydrograph Summary Report I - 'vd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph J. type flow interval peak hyd{ s) elevation storage description ( 0 ri gin) (cfs) (min) (min) ( cuff) (ft) ( cuff) 1 Rational 0.71 1 8 340 - - - Existing East 2 Rational 0.52 1 5 157 - --- --- Existing Alley 3 Rational 1.81 '1 5 542 - - --- Existing West 4 Combine 2.77 1 5 1,038 1,2,3 --- -- Total Combined 5 Rational 4.56 1 5 1,367 --- -- -- Proposed Cond T e = 5 6 Rational 2.89 1 15 2,605 -- -- -- Proposed Cond Te = 15 7 Rational 1.99 1 30 3,590 -- ----- -- Proposed Cond T e = 30 8 Rational 1.32 1 60 4,740 --- ---- - Proposed Cond T e = 60 9 Rational 0.85 1 120 6,100 -- ---- ---- Proposed Cond T e = 120 10 Rational' 0.54 1 240 7,741 - ---- ---- Proposed Cond T e = 240 11 Rational 0.41 1 360 8,865 - --- .-- Proposed Cond T e = 360 12 Rational 0.26 1 720 11, 138 --- -- -- Proposed Cond Te = 720 13 Reservoir 0.79 1 9 1,360 5 838.23 1 ,093 Detention Route 14 Reservoir 0.96 1 25 2,598 6 838.65 1,613 Detention Route Reservoir 0.97 1 45 3,583 7 838.67 1 ,638 Detention Route .0 Reservoir 0.88 1 80 4,733 8 838.43 t335 Detention Route 17 Reservoir 0.70 1 141 6,093 9 838.03 854 Detention Route 18 Reservoir 0.50 1 256 7,734 10 837.66 453 Detention Route 19 Reservoir 0.40 1 370 8,858 11 837.50 305 Detention Route I 20 Reservoir 0.26 1 727 11,131 12 837.36 192 Detention Route 21 Mod. Rational 1.69 1 5 4,046 --- --- - Proposed Cond T c = 5 22 Reservoir 1.09 1 42 4,039 21 839.01 2,069 Detention Route 23 Mod. Rational 1.75 1 15 3,941 --- --- --- Proposed Cond Te = 15 24 Reservoir 1.05 1 43 3,881 23 838.89 t919 Detention Route 25 Mod. Rational 1.57 1 30 4,241 - -- -- Proposed Cond T c = 30 26 Reservoir 0.99 1 56 4,234 25 838.73 1,714 Detention Route w050417 ddff1 01205. G PW Return Period: 10 Year Wednesday, Oct 12 2005, 5:54 AM 4 Hydrograph Summary Report I -"d. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph I. type flow i nte rval peak hyd(s) elevation storage descri ption ( origin) ( cfs ) (min) (min) ( cuff) (ft) ( cuff) 1 Rational 0.92 1 8 441 -- -- - Existing East 2 Rational 0.64 1 5 191 -- ---- -- Existing Alley 3 Rational 2.19 1 5 658 -- --- - Existing West 4 Combine 3.40 1 5 1,290 1,2,3 --- -- Total Combined 5 Rational 5.54 1 5 1,661 - -- - Proposed Cond T c = 5 6 Rational 4.08 1 15 3,673 - ---- --- Proposed Cond T c = 15 7 Rational 2.97 1 30 5,339 --- ----- --- Proposed Cond Tc = 30 8 Rational 1.96 1 60 7,040 -- ---- -- Proposed Cond T c = 60 9 Rational 1.20 1 120 8,608 -- ----- -- Proposed Cond T c = 120 10 Rational 0.70 1 240 10,017 -- --- ---- Proposed Cond T c = 240 11 Rational 0.50 1 360 10,790 --- ----- ------ Proposed Cond T c = 360 12 Rational 0.28 1 720 12,074 --- --- - Proposed Cond T c = 720 13 Reservoir 0.88 1 9 1,654 5 838.44 1,351 Detention Route 14 Reservoir 1.19 1 26 3,666 6 839.30 2,430 Detention Route Reservoir 1.27 1 47 5,331 7 839.58 2,749 Detention Route J Reservoir 1.17 1 84 7,033 8 839.27 2,389 Detention Route 17 Reservoir 0.93 1 146 8,600 9 838.57 1,510 Detention Route 18 Reservoir 0.63 1 262 10,010 10 837.89 703 Detention Route 19 Reservoir 0.48 1 377 10,783 11 837.62 415 Detention Route 20 Reservoir 0.28 1 730 12~O67 12 837.38 207 Detention Route 21 Mod. Rational 2.52 1 v 6,053 -- --- --- Pro posed Cond T c = 5 22 Reservoir 1.49 1 42 6,046 21 840.46 3,474 Detention Route 23 Mod. Rational 2.62 1 15 5,893 --- ----- ---- Proposed Cond Tc = 15 24 Reservoir 1.40 1 44 5,808 23 840.05 3,219 Detention Route 25 Mod. Rational 2.35 1 30 6,344 --- -- ---- Proposed Cond Tc = 30 26 Reservoir 1.32 1 58 6,336 25 839.77 2,953 Detention Route w050417ddff101205.GPW Return Period: 100 Year Wednesday, Oct 12 2005, 5:54 AM Pond Report Hydraflow Hydrographs by I ntelisolve Wednesday, Oct 122005,5:59 AM Pond No. 1 - Underground Detention Pond Data Pipe dia. = 4.00 ft Pipe length = 258.0 ft No. Barrels = 1.0 Slope = 0.00 % Invert elev. = 837.00 ft Stage I Storage Table Stage (ft) Elevation (ft) Contour area (sqff) Incr. Storage (cuft) Total storage (cuff) 0.00 837.00 00 0 0 0.20 837.20 00 61 61 0.40 837.40 00 108 169 0.60 837.60 00 136 305 0.80 837.80 00 157 462 1.00 838.00 00 172 634 1.20 838.20 00 184 819 1.40 838.40 00 194 t012 1.60 838.60 00 199 1,211 1.80 838.80 00 205 1,416 2.00 839.00 00 206 1,622 2.20 839.20 00 206 1,827 2.40 839.40 00 205 2,032 2.60 839.60 00 200 2,232 2.80 839.80 00 193 2,425 3.00 840.00 00 184 2,609 3.20 840.20 00 172 2,781 3.40 840.40 00 157 2,938 3.60 840.60 00 136 3,074 3.80 840.80 00 108 3,182 4.00 841.00 00 60 3,243 Culvert I Orifice Structures Weir Structures [A] [8] [C] [0] [A] [B] [C] [0] Rise (in) 12.00 6.00 0.00 0.00 Crest Len (ft) = 0.00 0.00 0.00 0.00 Span (in> 12.00 6.00 0.00 0.00 Crest EI. (ft) = 0.00 0.00 0.00 0.00 No. Barrels = 1 1 0 0 Weir Coeff. = 0.00 0.00 0.00 0.00 Invert EI. (ft) = 837.00 837.00 0.00 0.00 Weir Type Length eft) = 10.00 0.00 0.00 0.00 Multi-Stage = No No No No Slope (Ok) = 1.00 0.00 0.00 0.00 N-Value = .013 .013 .000 .000 Orif. Coerr. = 0.60 0.60 0.00 0.00 Multi-Stage = n/a Yes No No Eriiltration = 0.000 in/hr (Wet area) Tailwater Elev. = 0.00 ft Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Stage I Storage I Discharge Table Stage Storage Elevation Clv A Clv 8 ClvC Clv 0 WrA Wr8 \l\Ir C WrD ExfiJ T atal ft cuff ft cfs cfs cfs cfs crs cfs ers cfs cfs cfs 0.00 0 837.00 0.00 0.00 0.00 0.20 61 837.20 0.09 0.09 0.09 0.40 169 837.40 0.31 0.30 0.30 0.60 305 837.60 0.47 0.47 0.47 0.80 462 837.80 0.59 0.59 0.59 1.00 634 838~00 0.69 0.69 - 0.69 1.20 819 838.20 0.79 0.78 0.78 1.40 1,012 838.40 0.87 0.87 0.87 1.60 1,211 838.60 0.96 0.94 0.94 1.80 ),416 838.80 1.03 1.02 1.02 2.00 1,622 839.00 1.10 1.09 1.09 2.20 1,827 839.20 1.16 1.15 1.15 2.40 2,032 839.40 1.22 1.22 1.22 2.60 2,232 839.60 1.28 1.27 1.27 2.80 2,425 839.80 1.33 1.33 1.33 3.00 2,609 840.00 1.39 1.38 1.38 3.20 2,781 840.20 1.44 1.43 1.43 3.40 2,938 840.40 1.48 1.48 1.48 3.60 3,074 840.60 1.52 1.52 1.52 3.80 3,182 840.80 1.58 1.58 1.58 4.00 3,243 841.00 1.63 1.63 1.63 1 Hydrograph Return Period Recap I - 'vd. Hydrograph Inti ow Peak Outflow (cfs) Hydrograph ). type Hyd(s) description ( origin) 1-Yr 2-Yr 3-Yr 5-Yr . 1 0- Y r 25- Y r 50-Yr 100- Yr 1 Rational ----- . 0.00 0.55 - 0.65 0.71 0.79 0.86 0.92 Existing East 2 Rational ------ 0.00 0.46 ----- 0.50 0.52 0.57 0.60 0.64 Existing Alley 3 Rational ---- 0.00 1.57 ------- 1.72 1.,81 1.95 2.07 2.19 Existing West 4 Combine 1,2,3 0.00 2.38 ------ 2.63 2.77 3.01 3.21 3.40 Total Combined 5 Rational ----- 0.00 3.97 ------ 4.34 4.56 4.93 5.23 5.54 Proposed Cond Tc = 5 6 Rational ----- 0.00 2.05 ------ 2.56 2.89 3.38 3.73 4.08 Proposed Cond T c = 15 7 Rational ------- 0.00 1.34 ---- 1.73 1.99 2.38 2.67 2.97 Proposed Cond T c = 30 8 Rational ------- 0.00 0.88 ----- 1.13 1.32 1.56 1.76 1.96 Proposed Cond Tc = 60 9 Rational ------ 0.00 0.58 ------- 0.73 0.85 0.98 1.09 1.20 Proposed Cond Tc = 120 10 Rational ------ 0.00 0.38 ------ 0.47 0.54 0.60 0.65 0.70 Proposed Cond T c = 240 11 Rational ------ 0.00 0.29 ------- 0.36 0.41 0.45 0.48 0.50 Proposed Cond T c = 360 12 Rational ------- 0.00 0.19 --- 0.23 0.26 0.27 0.28 0.28 Proposed Cond Tc = 720 13 Reservoir 5 0.00 0.82 ----- 0.86 0.88 0.92 0.95 0.98 Detention Route 14 Reservoir 6 0.00 0.85 ----- 0.98 1.05' '1.16 1.23 1.30 Detention Route - Reservoir 7 0.00 0.80 ------- 0.95 1.04 1.17 1.27 1.37 Detention Route .0 Reservoir 8 0.00 0.68 ------ 0.83 0.93 1.05 1.15 1.24 Detention Route 17 Reservoir 9 0.00 0.52 ------ 0.64 0.72 0.82 0.90 0.97 Detention Route 18 Reservoir 10 0.00 0.37 ---- 0.45 0.51 0.56 0.61 0.64 Detention Route 19 Reservoir 11 0.00 0.29 --- 0.36 0.40 0.43 0.46 0.48 Detention Route 20 Reservoir 12 0.00 0.19 ------ 0.23 0.26 0.27 0.27 0.28 Detention Route 21 Mod. Rational ------ 0.00 1.13 ----- 1.45 1.69 2.01 2.27 2.52 Proposed Cond T c = 5 22 Reservoir 21 0.00 0.89 ----- 1.06 1.17 1.33 1.45 1.63 Detention Route 23 Mod. Rational ------ 0.00 1.17 ------ 1.51 1.75 2.09 2.36 2.62 Proposed Cond T c = 15 24 Reservoir 23 0.00 0.86 ---- 1.02 1.13 1.28 1.38 1.49 Detention Route 25 Mod. Rational ---- 0.00 1.05 ------ 1.35 1.57 1.87 2.11 2.35 Proposed Cond Tc = 30 26 Reservoir 25 0.00 0.80 ------ 0.96 1.06 1.20 1.31 1.41 Detention Route Proj. file: w050417eegg1 01205.GPW Wednesday, Oct 12 2005, 5.:59 AM 2 Hydrograph Summary Report ~. ~yd. Hydrograph ' Peak Time Time to Volume Inflow Maximum Maximum Hydrograph ). type flow interval peak hyd( s) elevation storage descri ption (origin) ( cfs ) (min) (min) ( cuft) (ft) ( cuff) 1 Rational 0.55 1 8 265 -- ---- - 'Existing East 2 Rational 0.46 1 5 137 - -- - Existing Alley 3 Rational 1.57 1 5 472 - - --- Existing West 4 Combine 2.38 1 5 874 1,2,3 - -- Total Combined 5 Rational 3.97 1 5 1 , 192 -- --- - Proposed Cond Tc = 5 6 Rational 2.05 1 15 1,842 --- ---- ---- Proposed Cond Tc = 15 7 Rational 1.34 1 30 2,417 --- ---- --- Proposed Cond Tc = 30 8 Rational 0.88 1 60 3,168 --- ---- ----- Proposed Cond T c = 60 9 Rational 0.58 1 120 4, 150 --- - --- Proposed Cond T c = 120 10 Rational 0.38 1 240 5,435 --- ----- --- Proposed Cond T c = 240 11 Rational 0.29 1 360 6,364 --- - -- Proposed Cond Tc = 360 12 Rational 0.19 1 720 8,333 -- --- -- Proposed Cond T c = 720 13 Reservoir 0.82 1 9 1,186 5 838.29 909 Detention Route 14 Reservoir 0.85 1 24 1,836 6 838.37 981 Detention Route .('1 Reservoir 0.80 1 42 2,411 7 838.24 857 Detention Route d Reservoir 0.68 1 74 3, 1 62 8 837.98 616 Detention Route 17 Reservoir 0.52 1 133 4,144 9 837.68 369 Detention Route 18 Reservoir 0.37 1 248 5,429 10 837.46 211 Detention Route 19 Reservoir 0.29 1 366 6,358 11 837.39 165 Detention Route 20 Reservoir 0.19 1 725 8,327 12 837.31 119 Detention Route 21 Mod. Rational 1.13 1 5 2,704 - ----- -- Proposed Cond T c = 5 22 Reservoir 0.89 1 41 2,699 21 838.45 1,059 Detention Route 23 Mod. Rational 1.17 1 15 2,637 --- ----- --- Proposed Cond T c = 15 24 Reservoir 0.86 1 41 2,596 23 838.38 996 Detention Route 25 Mod. Rational 1.05 1 30 2,832 -- -- -- Proposed Cond T c = 30 26 Reservoir 0.80 1 52 '2,826 25 838.23 849 Detention Route w050417eegg101205.GPW Return Period: 2 Year Wednesday, Oct 12 2005, 5:59 AM 3 Hydrograph Summary Report I . 'd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph ). type flow interval peak hyd{s) elevation storage description ( origin) ( cfs) (min) (min) ( cuft) (ft) ( cuff) 1 Rational 0.71 1 8 340 - -- - Existing East 2 Rational 0.52 1 5 157 - -- --- Existing Alley 3 Rational 1.81 1 5 542 - - -- Existing West 4 Combine 2.77 1 5 1,038 1,2,3 --- - Total Combined 5 Rational 4.56 1 5 1,367 --- - - Proposed Cond T e = 5 6 Rational 2.89 1 15 2,605 -- --- ---- Proposed Cond T e = 15 7 Rational 1.99 1 30 3,590 -- -- --- Proposed Cond T c = 30 8 Rational 1.32 1 60 4,740 --- ---- --- Proposed Cond T e = 60 9 Rational 0.85 1 120 6,100 -- ---- --- Proposed Cond Te = 120 10 Rational 0.54 1 240 7,741 -- -- - Proposed Cond Te = 240 11 Rational 0.41 1 360 8,865 -- --- ----- Proposed Cond T e = 360 12 Rational 0.26 1 720 11 , 138 - --- ---- Proposed Cond T e = 720 13 Reservoir 0.88 1 9 1,361 5 838.45 1,058 Detention Route 14 Reservoir 1.05 1 25 2,599 6 838.90 1,514 Detention Route Reservoir 1.04 1 44 -3,584 7 838.87 1,489 Detention Route d Reservoir 0.93 1 78 4,734 8 838.55 1 , 158 Detention Route 17 Reservoir 0.72 1 138 6,094 9 838.07 703 Detention Route 18 Reservoir 0.51 1 254 7,735 10 837.67 356 Detention Route 19 Reservoir 0.40 1 370 8,859 11 837.50 238 Detention Route 20 Reservoir 0.26 1 725 1 t 132 12 837.36 149 Detention Route 21 Mod. Rational 1.69 1 5 4,046 -- --- --- Proposed Cond T c = 5 22 Reservoir 1.17 1 42 4,040 21 839.26 1,887 Detention Route 23 Mod. Rational 1.75 1 15 3,941 -- -- -- Proposed Cond T e = 15 24 Reservoir 1.13 1 42 3,883 23 839.13 1,753 Detention Route 25 Mod. Rational 1.57 1 30 4,241 . -- - -- Proposed Cond Te = 30 26 Reservoir 1.06 1 55 4,235 25 838.92 1,537 Detention Route w050417eegg101205.GPW Return Period: 1 0 Year Wednesday, Oct 12 2005, 5:59 AM 4 Hydrograph Summary Report r 'vd. Hydrograph Peak Time Time to Volume Inflow Maximum Maximum Hydrograph ). type flow interval peak hyd( s) elevation storage description ( origin) (cfs) (min) (min) ( cuft) (ft) ( cuff) 1 Rational 0.92 1 8 441 - - - Existing East 2 Rational 0.64 1 5 191 - - - Existing Alley 3 Rational 2.19 1 5 658 - -- - Existing West 4 Combine 3.40 1 5 1,290 1,2,3 --- -- Total Combined 5 Rational 5.54 1 5 1,661 - ---- -- Proposed Cond T e = 5 6 Rational 4.08 1 15 3,673 -- -- -- Proposed Cond Te = 15 7, Rational 2.97 1 30 5,339 - ---- ---- Proposed Cond T e = 30 8 Rational 1.96 1 60 7,040 - ------ - Proposed Cond T e = 60 9 Rational 1.20 1 120 8,608 -- -- -- Proposed Cond T e = 120 10 Rational 0.70 1 240 10,017 -- ----- ---- Proposed Cond T c = 240 11 Rational 0.50 1 360 1 0,790 - ----- --- Proposed Cond Te = 360 12 Rational 0.28 1 720 12,074 - ---- -- Proposed Cond T e = 720 13 Reservoir 0.98 1 9 1,655 5 838.70 1,313 Detention Route 14 Reservoir 1.30 1 25 3,667 6 839.68 2,309 Detention Route ~ Reservoir 1.37 1 46 5,333 7 839.93 2,546 Detention Route j Reservoir 1.24 1 82 7,034 8 839.49 2,126 Detention Route 17 Reservoir 0.97 1 143 8,602 9 838.66 1 ,272 Detention Route 18 Reservoir 0.64 1 258 10,011 10 837.91 561 Detention Route 19 Reservoir 0.48 1 372 10,784 11 837.62 323 Detention Route 20 Reservoir 0.28 1 725 12,068 12 837.38 159 Detention Route 21 Mod. Rational 2.52 1 5 6,053 -- --- - Proposed Cond T c = 5 22 Reservoir 1.63 1 42 6,047 21 840.98 3.238 Detention Route 23 Mod. Rational 2.62 1 15 5,893 -- --- - Proposed Cond T c = 15 24 Reservoir 1.49 1 43 5,809 23 840.49 3,000 Detention Route 25 Mod. Rational 2.35 1 30 6,344 -- ---- -- Proposed Cond T c = 30 26 Reservoir 1.41 1 57 6,338 25 840. 12 2,708 Detention Route w050417eegg101205.GPW Return Period: 100 Year Wednesday, Oct 12 2005, 5:59 AM