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31749
Hldrology Drainage Report CITY OF LA QUINTA A.P.N.- 649 - 040 -004 PARCEL MAP NO. 31749 Feiro Engineering, Inc. P.O. Box 12980 Palm Desert, CA 92255 (760) 346 -8015 (760) 346 -2548 Fax www.feiro.net K. r. wl No.C52260 j, �'• EXP. 1 2/31 /02,%� OFCAL�F�R 105H -001 10/31/03 r� The purpose of this report is to determine off - site /on -site hydrologic flows along with establishing the 100 -yr, 24 -hr. storm event volumes in order to size any required on -site detention basins. The site is bounded on the north by Westward Ho Drive, on the west by Dune Palms Road, on the south by partially developed land, and on the east by vacant land. The historical natural runoff pattern prior to any development in the immediate vicinity was generally easterly toward the Whitewater River. However, subsequent to development having taken place, and predicated upon the governmental agencies requirement over the years that all new development retain the incremental increase of the 100 yr., 24 hr. storm event on -site, there is relatively little, if any, runoff entering onto the proposed site. The only historic runoff is presently coming from the property immediately adjacent to the west. The volume of this runoff was calculated to be a little over 1000 Cu.Ft. during the 100 -yr., 24 -Hr. storm event. Furthermore, should there be any off - site flows coming on -site, such flows would continue to follow their current natural flow pattern easterly along the Westward Ho Drive right -of -way and ultimately converging with the Whitewater River Storm Channel. Therefore, the main hydrologic consideration will be that of determining the necessity of any on -site detention, predicated upon the incremental increase over the undeveloped state to the developed state, caused by the 100 yr., 24 hr. storm event. The U.S.D.A. Soil Survey Map indicates that the hydrologic soil group of the tributary area is primarily "Myoma fine sand" (MUD), and is listed as a hydrologic soils group A. The site is mostly covered with normal desert brush and raw land cover. The tributary area is fairly flat, thereby resulting in a runoff index number of 71 for the undeveloped site, and 32 for the developed site. (RCFC &WCD, Plate E -6.1 (1 of 2)). This translates into an infiltration rate for pervious areas of the watershed to be 0.35 in/hr., for the undeveloped site and 0.74 in/hr., for the developed site. (RCFC &WCD, Plate E -2.2). Based upon the above criteria, and using 0% factor for impervious areas of the undeveloped site and a 40% impervious factor for the developed site, and using an AMC -II curve, the RCFCWD method reflects that the 100 -yr., 24 -hr. storm event retention be 1040 Cu.Ft. for Parcel 1; 860 Cu.Ft. for Parcel 2; and 860 Cu.Ft. for Parcel 3. The on -site detention basins will be designed to T onald oda he se capacities. K. Feiro President R.C.E. 52260 QFOFESS /��.� 0 No.C52260 I rr) 181 `. EXP. 12/31 /02 i -b L\* :\ , 4 i \ 4TF c'CAl \ OQ�P i �. OF F . SHEET NO. 11 RIVERSIDE COUNTY, CALIFORNIA, COACHELLA VALLEY AREA w (LA QUINTA QUADRANGLE) 5' 33`45' 03 lOSI -�- Gb I M- �i RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL -COVER COMPLEXES FOR PERVIOUS AREAS -AMC II T Cover Type (3) Quality of oil Group A I B C I D Cover (21 NATURAL COVERS - Barren 78 86 91 93 (Rockland, eroded and graded land) Chaparrel, Broadleaf Poor 53 70 80 85 (Manzonita, ceanothus and scrub oak) _ Fair 40 63 75 81 Good 31. 57 71 78 s a Chaparre1, Narrowleaf Poor k7.1 82 88 91 (Chamise and redshank) Fair 55 72 81 86 -Grass, Annual or Perennial Poor 67 78 86 89 Fair 50 69 79 84 Good 38 61 74 80 Meadows or Cienegas Poor 63 77 85 88 '(Areas with seasonally high water table, Fair 51 70 80 84 principal vegetation is sod forming grass) Good 30 58 72 78 Open Brush Poor 62 76 84 88 (Soft wood shrubs - buckwheat, sage, etc.) Fair 46 66 77 83 Good 41 63 75 81 Woodland Poor 45 66 77 83 (.Coniferous or broadleaf trees predominate. Fair 36 60 73 79 Canopy density is at least 50 percent) Good 28 55 70 77 Woodland, Grass Poor 57 73 82 86 (Coniferous or broadleaf trees with canopy Fair 44 65 77 82 density from 20 to 50 percent) Good 33 58 72 79 URBAN COVERS - Residential or Commercial Landscaping Good 32 56 69 75 (Lawn, shrubs, etc.) Turf Poor 58 74 83 87 (Irrigated and mowed grass) Fair 44 65 77 -82 Good 33 58 72 79 AGRICULTURAL COVERS - Fallow 76 85 90 92 (Land plowed but not tilled or seeded) R C F C a W C D RUNOFF INDEX NUMBERS FOR HYDROLOGY NMANUAL PERVIOUS AREAS PLATE E-6.1 0 of 2) A" N 105H- 001 - OFFSITE Unit Hydrograph -24 Hr.xls 10/31/03 10:50 AM UNIT PATTERN % STORM RAIN LOSS RATE EFF RAIN Q[CFS] Volume (Cu Ft) 1 0.2 0.036 0.032 0.004 0.0 0 2 0.3 0.054 0.049 0.005 0.0 2 3 0.3 0.054 0.049 0.005 0.0 4 4 0.4 0.072 0.065 0.007 0.0 7 5 0.3 0.054 0.049 0.005 0.0 9 6 0.3 0.054 0.049 0.005 0.0 11 7 0.3 0.054 0.049 0.005 0.0 13 8 0.4 0.072 0.065 0.007 0.0 16 9 0.4 0.072 0.065 0.007 0.0 19 10 0.4 0.072 0.065 0.007 0.0 21 11 0.5 0,090 0,081 0,009 0.0 25 12 0.5 0.090 0.081 0.009 0.0 28 13 0.5 0.090 0.081 0.009 0.0 32 14 0.5 0.090 0.081 0.009 0.0 35 15 0.5 0.090 0.081 0.009 0.0 39 16 0.6 0.108 0.097 0.011 0.0 43 17 0.6 0.108 0.097 0,011 0.0 47 18 0.7 0.126 0.113 0.013 0.0 52 19 0.7 0.126 0.113 0.013 0.0 57 20 0.8 0.144 0.130 0.014 0.0 62 21 0.6 0.108 0.097 0.011 0.0 66 22 0.7 0.126 0.113 0.013 0.0 71 23 0.8 0.144 0.130 0.014 0.0 77 24 0.8 0.144 0.130 0.014 0.0 82 25 0.9 0.162 0.146 0.016 0.0 88 26 0.9 0.162 0.146 0.016 0.0 95 27 1.0 0.180 0.162 0.018 0.0 101 28 1.0 0.180 0.162 0.018 0.0 108 29 1.0 0.180 0.162 0.018 0.0 115 30 1.1 0.198 0.178 0.020 0.0 123 31 1.2 0.216 0,194 0.022 0.0 131 32 1.3 0.234 0,211 0.023 0.0 140 33 1.5 0.270 0.243 0.027 0.0 150 34 1.5 0.270 0.243 0.027 0.0 161 35 1.6 0.288 0.259 0.029 0.0 172 36 1.7 0.306 0.275 0.031 0.0 184 37 1,9 0.342 0.308 0,034 0.0 197 38 2.0 0.360 0.350 0.010 0.0 201 39 2,1 0.378 0.350 0.028 0.0 211 40 2.2 0.396 0.350 0.046 0.0 229 41 1.5 0.270 0.243 0.027 0.0 239 42 1.5 0.270 0.243 0.027 0.0 250 43 2.0 0.360 0.350 0.010 0.0 253 44 2.0 0.360 0.350 0.010 0.0 257 45 1.9 0.342 0.308 0.034 0.0 270 46 1.9 0.342 0.308 0.034 0.0 284 47 1.7 0.306 0.275 0.031 0.0 295 48 1.8 0.324 0.292 0.032 0.0 308 49 2.5 0.450 0.350 0.100 0.0 346 50 2.6 0.468 0.350' 0.118 0.0 391 51 2.8 0.504 0.350 0.154 0.1 450 52 2.9 0.522 0.350 0.172 0.1 516 53 3.4 0.612 0.350 0.262 0:1 617 <_Qmax 64 3.4 0.612 0.350 0.262 0.1 717 55 2.3 0.414 0.350 0.064 0,0 742 56 2.3 0.414 0.350 0.064 0.0 766 57 2.7 0.486 0.350 0.136 0.1 818 1 of 2 Pri 58 2.6 0.468 59 2.5 0.450 60 2.4 0.432 61 2.3 0.414 62 1.9 0.342 63 1.9 0.342 64 0.4 0.072 65 0.4 0.072 66 0.3 0.054 67 0.3 0.054 68 0.5 0.090 69 0.5 0.090 70 0.5 0.090 71 0.4 0.072 72 0.4 0.072 73 0.4 0.072 74 0.3 0.054 75 0.2 0.036 76 0.3 0.054 77 0.4 0.072 78 0.3 0.054 79 0.2 0.036 80 0.3 0.054 81 0.3 0.054 82 0.3 0.054 83 0.2 0.036 84 0.3 0.054 85 0.2 0.036 86 0.3 0.054 87 0.2 0.036 88 0.3 0.054 89 0.2 0.036 90 0.2 0.036 91 0.2 0.036 92 0.2 0.036 93 0.2 0.036 94 0.2 0.036 95 0.2 0,036 96 0.2 0.036 0.004 Total Rain --- > 1,039 0.049 Unit Time Period = 15 Min. 1,041 * Point Rainfall 4:5DD 0.004 Pattern % Coef. 0.180 * Pery Loss Rate (Fp) F 0.350 1,044 0.032 * Impery Area %1 0.000 1,045 Adj. Loss Rate 0.350 * Trib Area (sf) 18,370 EFF. RAIN 0.687 Volume (cf) 1051 105H- 001- OFFSITE Unit Hydrograph -24 Hr.xls 10/31/03 10:50 AM 0.350 0.118 0.0 864 0.350 0.100 0.0 902 0.350 0.082 0.0 934 0.350 0.064 0.0 958 0.308 0.034 0.0 971 0.308 0.034 0.0 984 0.065 0.007 0.0 987 0.065 0.007 0.0 990 0.049 0.005 0.0 992 0.049 0.005 0.0 994 0.081 0.009 0.0 997 0.081 0.009 0.0 1,001 0.081 0.009 0.0 1,004 0.065 0.007 0.0 1,007 0.065 0.007 0.0 1,010 0.065 0.007 0.0 1,013 0.049 0.005 0.0 1,015 0.032 0.004 0.0 1,016 0.049 0.005 0.0 1,018 0.065 0.007 0.0 1,021 0.049 0.005 0.0 1,023 0.032 0.004 0.0 1,024 0.049 " 0.005 0.0 1,026 0.049 0.005 0.0 1,028 0.049 0.005 0.0 1,031 0.032 0.004 0.0 1,032 0.049 0.005 0.0 1,034 0.032 ow4 o.o 1,035 0.049 0.005 0.0 1,037 0.032 0.004 0.0 1,039 0.049 0.005 0.0 1,041 0.032 0.004 0.0 1,042 0.032 0.004 0.0 1,044 0.032 0.004 0.0 1,045 0.032 0.004 0.0 1,046 0.032 0.004 0.0 1,048 0.032 0.004 0.0 1,049 0.032 0.004 0.0 1,051 0.032 0.004 0.0 1,052 2.747 0.4 AC. 2 of 2 105H- 001- ONSITE- PARCEL 1 Unit Hydrograph -24 Hr.xls 10/31/03 10:57 AM UNIT PATTERN % STORM RAIN LOSS RATE EFF RAIN Q[CFS] Volume (Cu Ft) 1 0.2 0.036 0.032 0.004 0.0 0 2 0.3 0.054 0.049 0.005 0.0 3 3 0.3 0.054 0.049 0.005 0.0 6 4 0.4 0.072 0.065 0.007 0.0 10 5 0.3 0.054 0.049. 0.005_ 0.0 13 6 0.3 0.054 0.049 0.005 0.0 16 7 0.3 0.054 0.049 0.005 0.0 19 8 0.4 0.072 0.065 0.007 0.0 23 9 0.4 0.072 0.065 0.007 0.0 27 10 0.4 0.072 0.065 0.007 0.0 31 11 0.5 0.090 0.081 0.009 0.0 37 12 0.5 0.090 0.081 0.009 0.0 42 13 0.5 0.090 0.081 0.009 0.0 47 14 0.5 0.090 0.081 0.009 0.0 52 15 0.5 0.090 0.081 0.009 0.0 57 16 0.6 0.108 0.097 0.011 0.0 63 17 0.6 0.108 0.097 0.011 0.0 69 18 0.7 0.126 0.113 0.013 0.0 76 19 0.7 0.126 0.113 0.013 0.0 83 20 0.8 0.144 0.130 0.014 0.0 91 21 0.6 0.108 0.097 0.011 0.0 97 22 0.7 0.126 0.113 0.013 0.0 104 23 0.8 0.144 0.130 0.014 0.0 113 24 0.8 0.144 0.130 0.014 0.0 121 25 0.9 0.162 0.146 0.016 0.0 130 26 0.9 0.162 0.146 0.016 0.0 139 27 1.0 0.180 0.162 0.018, 0.0 149 28 1.0 0.180 0.162 0.018 0.0 159 29 1.0 0.180 0.162 0.018 0.0 169 30 1.1 0.198 0.178 0.020 0.0 181 31 1.2 0.216 0.194 0.022 0.0 193 32 1.3 0.234 0.211 0.023 0.0 206 33 1.5 0.270 0.243 0.027 0.0 221 34 1.5 0.270 0.243 0.027 0.0 236 35 1.6 0.288 0.259 0.029 0.0 253 36 1.7 0.306 0.275 0.031 0.0 270 37 1.9 0.342 0.308 0.034 0.0 289 38 2.0 0.360 0.324 0.036 0.0 309 39 2.1 0.378 0.340 0.038 0.0 331 40 2.2 0.396 0.356 0.040 0.0 353 41 1.5 0.270 0.243 0.027 0.0 368 42 1.5 0.270 0.243 0.027 0.0 383 43 2.0 0.360 0.324 0.036 0.0 404 44 2.0 0.360 0.324 0.036 0.0 424 45 1.9 0.342 0.308 0.034 0.0 443 46 1.9 0.342 0.308 0.034 0.0 463 47 1.7 0.306 0.275 0.031 0.0 480 48 1.8 0.324 0.292 0.032 0.0 498 49 2.5 0.450 0.405 0.045 0.0 523 50 2.6 0.468 0.421 0.047 0.0 550 51 2.8 0.504 0.474 0.030 0.0 567 52 2.9 0.522 0.474 0.048 0.0 594 53 3.4 0.612 0.474 0.138 0.1 672 -Amax 54 3.4 0.612 0.474 0.138 0.1 750 55 2.3 0.414 0.373 0.041 0.0 774 56 2.3 0.414 0.373 0.041 0.0 797 57 2.7 0.486 0.474 0.012 0.0 804 `n1Y� ij ^, •;� �', 105H- 001- ONSITE- PARCEL 1;Unit Hydrograph -24 Hr.xls 10_/31/03 10:57 AM rt - 58 2.6 , 0.468 0.421 0.047 0.0 830 '. 59' . ` . 2.5 0.450 0.405 0.045 0.0 856 ` - 60 2:4 0.432 0.389 0.043 0.0 880 + 61 r 2.3 0.414 !� ' 0.373 0.041 0.0 903 »r 62,' 1.9 0.342 t 0.308 0.034 0.0 923 ty'yi ° "63 1.9 ' 0.342 0.308 0.034 0.0 942 . 64 0.4 0.072 0.065 0.007 0.0 946 +.. 65 0.4 0.072 •0.065 0.007 0.0 950 4 r� 66 N 0.3 :'+ _ 0.054 0.049 0.005 0.0 9.3 ` 67 0.3 0.054 0.049 0.005 0.0 ' 956 68 ' '' ' 0.5 0.090 0.081 0.009 0.0 961 `.• 69 0.5 , 0.090 0.081 0.009 0.0 966 70 0.5 , ;'. 0.090 0.081 0.009 0.0 971 .71 .: 0.4 - 0.072 t' 0.065 0.007 OA 975. . .72 0.4 0.072 0.065 0.007 0.0 979 : J3,' 0.4 0.072 ,. " 0.085 0.007 0.0 984 m 174 0.3 * 0.054 0.049 0.005 0.0 987 ' S 75 0.2 • • 0.036. 0.032 0.004 0.0 989 76. 0.3 0.054 0.049 0.005 0.0 . 992 - ,' 77~ 0.4 0.072 0.065 0.007 0.0 996 78 f j, 0.3` 0.054 0.049 0.005 0.0 ' E 79 0.2 0.036 � s ' • 032 4 0.004 0.0. _ 1,001 s _ 80 i 0.3 0.054 0.049 0.005 0.0 1,004 81 7 } v 0.054 +r,, 0.049 0.005 0.0 � 1 007 w' S 82 0.3 •0. "•. 054 0.049 ,. 0.0� 0.0 _ t 010 _ .. 83 ' ' ' `• 0.2 = .? 0.036 0.032 0.004 0.0 . ' 1,012 84 i 0.3 -0.054 0.049 0.005 0.0 1,015 85. , 0.2 0.036 0.032 0.004. 0.0 1,017 ;y 86 0.3 0.054 0.049 0.005 0.0 1,020 y 87 0.2 0.036 'u 0.032 - 0.004 0.0 1,022 88` r 03 0.054 r. 0.049 OQOS 0.0 - 1,025 �. ';t `':� 89 0.2 � ` , 0.036 0.032 _ 0.004 0.0 1,027 ` $ - 90 `• ; t 0.2 0.036 r ' ,,. 0.032. 0.004 0.0 1,029 .,`►• �- 91 0.2, 0.036 0.032 0.004 0.0 - t 1,031 2" 0.2 0.036 0.032 _ 0.004. 0.0 ' . 1,033' �' ^ w '93 0.2 0.032 `0.032 0.004 0.0 1,035 94 , 0.2 6.036 0.004 0.0 1,037 95' 0.2 0.036 •; 0.032 0.004 0.0 '1,039 " .: 96 ay 0.2 0.036 0.032 0.004 0.0 71,041 ` Total Rain - - - >' `" 1.851 { Time Period = 15 Min. " ,Unit * Point Rainfall Y; Pattern % Coef. 0.180 ,6 , t * Pery Loss Rate (Fp) 0.740. Impery Area % 'Adj. 0:400 t Loss Rate 0.474 Trib Area (sf), 27,000 ` 'f0.6 AC. EFF• RAIN 0.463 ` ` Volume (cf) 1041 J 'w . '• • �f,_ -. .. ,. ,� � •+ ��' �' r NSF,. �- 105H- 001- ONSITE- PARCEL 2 Unit Hydrograph -24 Hr.xls 10/31/03 11:04 AM UNIT PATTERN % STORM RAIN LOSS RATE EFF RAIN Q[CFS] Volume (Cu Ft) 1 0.2 0.036 0.032 0.004 0.0 0 2 0.3 0.054 0.049 0.005 O;v 3 3 0.3 0.054 0.049 0.005 0.0 5 4 0.4 0.072 0.065 0.007 0.0 8 5 0.3 0.054 0.049 0.005 0.0 11 6 0.3 0.054 0.049 0.005 0.0 13 7 0.3 0.054 0.049 0.005 0.0 16 8 0.4 0.072 0.065 0.007 0.0 19 9 0.4 0.072 0.065 0.007 0.0 23 10 0.4 0.072 065 0.007 0.0 26 11 0.5 0.090 0.081 0.009 0.0 30 12 0.5 0.090 0.081 0.009 0.0 34 13 0.5 0.090 0.081 0.009 0.0 38 14 0.5 0.090 0.081 0.009 0.0 43 15 0.5 0.090 0.081 0.009 0.0 47 16 0.6 0.108 0.097 .0.011 0.0 52 17 0.6 0.108 0.097 0.011 0.0 57 18 0.7 0.126 0.113 0.013 0.0 63 19 0.7 0.126 0.113 0.013 0.0 69 20 0.8 0.144 0.130 0.014 0.0 75 21 0.6 0.108 0.097 0.011 0.0 80 22 0.7 0.126 0.113 0.013 0.0 86 23 0.8 0.144 0.130 0.014 0.0 93 24 0.8 0.144 0.130 0.014 0.0 100 25 0.9 0.162 0.146 0.016 0.0 107 26 0.9 0.162 0.146 0.016 0.0 115 27 1.0 0.180 0.162 0.018 0.0 123 28 1.0 0.180 0.162 0.018 0.0 131 29 1.0 0.180 0.162 0.018 0.0 140 30 1.1 0.198 0.178 0.020 0.0 149 31 1.2 0.216 0.194 0.022 0.0 159 32 1.3 0.234 0.211 0.023 0.0 170 33 1.5 0.270 0.243 0.027 0.0 182 34 1.5 0.270 0.243 0.027 0.0 195 35 1.6 0.288 0.259 0.029 0.0 208 36 1.7 0.306 0.275 0.031 0.0 222 37 1.9 0.342 0.308 0.034 0.0 238 38 2.0 0.360 0.324 0.036 0.0 255 39 2.1 0.378 0.340 0.038 0.0 273 40 2.2 0.396 0.356 0.040 0.0 291 41 1.5 0.270 0.243 0.027 0.0 304 42 1.5 0.270 0.243 0.027 0.0 316 43 2.0 0.360 0.324 0.036 0.0 333 44 2.0 0.360 0.324 0.036 0.0 350 45 1.9 0.342 0.308 0.034 0.0 366 46 1.9 0.342 0.308 0.034 0.0 381 47 1.7 0306 0.275 0.031 0.0 396 48 1.8 0.324 0.292 0.032 0.0 411 49 2.5 0.450 0.405 0.045 0.0 432 50 2.6 0.468 0.421 0.047 0.0 453 51 2.8 0.504 0.474 0.030 0.0 467 52 2.9 0.522 0.474 0.048 0.0 490 53 3.4 0.612 0.474 0.138 0:1 554 -Amax 54 3.4 0.612 0.474 0.138 0.1 619 55 2.3 0.414 0.373 0.041 0.0 638 56 2.3 0.414 0.373 0.041 0.0 657 57 2.7 0.486 0.474 0.012 0.0 663 1 of 2 0 105H- 001- ONSITE- PARCEL 2 Unit Hydrograph -24 Hr.xis 10/31/03 11:04 AM 58 2.6 0.468 0.421 0.047 0.0 685 59 2.5 0.450 0.405 0.045 0.0 705 60 2.4 0.432 0.389 0.043 0.0 726 .61 2.3 0.414 0.373 0.041 0.0 745 62 1.9 0.342 0.308 0.034 0.0 761 63 1.9 0.342 0.308 0.034 0.0 777 64 0.4 0.072 0.065 0.007 0.0 780 65 0.4 0.072 0.065 0.007 0.0. 783 66 0.3 0.054 0.049 0.005 0.0 786 67 0.3 0.054 0.049 0.005 0.0 788 68 0.5 0.090 0.081 0.009 0.0 792 69 0.5 0.090 0.081 0.009 0.0 797 70 0.5 0.090 0,081 0.009 0.0 801 71 0.4 0.072 0.065 0.007 0.0 804 72 0.4 0.072 0.065 0.007 0.0 808 73 0.4 0.072 0.065 0.007 0.0 811 74 0.3 0.054 0.049 0.005 0.0 813 75 0.2 0.036 0.032 0.004 0.0 815 76 0.3 0.054 0.049 0.005 0.0 818 77 0.4 0.072 0.065 0.007 0.0 821 78 0.3 0.054 0.049 0.005 0.0 823 79 0.2 0.036 0.032 0.004 0.0 825 80 0.3 0.054 0.049 0.005 0.0 828 81 0.3 0.054 0.049 0.005 0.0 830 82 0.3 0.054 0.049 0.005 0.0 833 83 0.2 0.036 0.032 0.004 0.0 834 84 0.3 0.054 0.049 0.005 0.0 837 85 0.2 0.036 0.032 0.004 0.0 838 86 0.3 0.054 0.049 0.005 0.0 841 87 0.2 0.036 0.032 0.004 0.0 843 88 0.3 0.054 0.049 0.005 0.0 845 89 0.2 0.036 0.032 0.004 0.0 847 90 0.2 0.036 0.032 0.004 0.0 848 91 0.2 0.036 0.032 0,004 0.0 850 92 0.2 0.036 0.032 0.004 0.0 852 93 0.2 0.036 0.032 0.004 0.0 854 94 0.2 0.036 0.032 0.004 0.0 855 95 0.2 0.036 0.032 0.004 0.0 857 96 0.2 0.036 0.032 0.004 0.0 859 Total Rain -> 1.851 Unit Time Period = 15 Min. * Point Rainfall 4.500 Pattem % Coef. 0.180 * Pery Loss Rate (Fp) 0.740 * Impery Area YJ 0.400 Adj. Loss Rate 0.474 * Trib Area (sf) [� 22,260 0.5 AC. EFF. RAIN 0.463 Volume (cf) 858 2 of 2 A, 2 "& �v 105H- 001- ONSITE- PARCEL 3 Unit Hydrograph -24 Hr.xls 10/31/03 11:08 AM UNIT PATTERN % STORM RAIN LOSS RATE EFF RAIN Q[CFS] Volume (Cu Ft) 1 0,2 0.036 0.032 0.004 0.0 0 2 0.3 0.054 0.049 0.005 0.0 3 3 0.3 0.054 0.049 0.005 0.0 5 4 0.4 0.072 0.065 0.007 0.0 8 5 0.3 0.054 0.049 0.005 0.0 11 6 03 0.054 0.049 0.005 0.0 13 7 0.3 0.054 0.049 0.005 0.0 16 8 0.4 0.072 0.065 0.007 0.0 19 9 0.4 0.072 0.065 0.007 0.0 23 10 0.4 0.072 0.065 0.007 0.0 26 11 0.5 0.090 0.081 0.009 0.0 30 12 0.5 0.090 0.081 0.009 0.0 34 13 0.5 0.090 0.081 0.009 0.0 38 y 14 .0.5 0.090 0.081 0.009 0.0 43 15 0.5 0.090 0.081 0.009 0.0 47 16 0.6 0.108 0.097 0.011 0.0 52 17 0.6 0.108 0.097 0.011 0.0 57 18 0.7 0.126 0.113 0.013 0.0 63 19 0.7 0.126 0.113 0.013 0.0 68 20 0.8 0.144 0.130 0.014 0.0 75 21 0.6 0.108 0.097 0.011 0.0 80 22 0.7 0.126 0.113 0.013 0.0 86 23 0.8 0.144 0,130 0.014 0.0 93 24 0.8 0.144 0,130 0.014 0.0 99 25 0.9 0.162 0.146 0.016 0.0 107 26 0.9 0.162 0.146 0.016 0.0 114 27 1.0 0.180 0.162 0.018 0.0 123 28 1.0 0.180 0.162 0.018 0.0 131 29 1.0 0.180 0.162 0.018 0.0 139 30 1.1 0.198 0.178 0.020 0.0 149 31 1.2 0.216 0.194 0.022 0.0 159 32 1.3 0.234 0.211 0.023 0.0 169 33 1.5 0.270 0.243 0.027 0.0 182 34 1.5 0.270 0.243 0.027 0.0 194 35 1.6 0.288 0.259 0.029 0.0 208 36 1.7 0.306 0.275 0.031 0.0 222 37 1.9 0.342 0.308 0.034 0.0 238 38 2.0 0.360 0.324 0.036 0.0 255 39 2.1 0.378 0.340 0.038 0.0 272 40 2.2 0.396 0.356 0.040 0.0 . 290 41 1.5 0.270 0.243 0.027 0.0 303 42 1.5 0.270 0.243 0.027 0.0 316 43 2.0 0.360 0.324 0.036 0.0 332 44 2.0 0.360 0.324 0.036 0.0 349 45 1.9 0.342 0.308 0.034 0.0 365 46 1.9 0.342 0.308 0.034 0.0 381 47 1.7 0.306 0.275 0.031 0.0 395 48 1.8 0.324 0.292 0.032 0.0 410 49 2.5 0.450 0.405 0.045 0.0 431 50 2.6 0.468 0.421 0.047 0.0 452 51 2.8 0.504 0.474 0.030 0.0 467 52 2.9 0.522 0.474 0.048 0.0 489 53 3.4 0.612 0.474 0.138 0.1 553 < -Qmax 54 3.4 0.612 0.474 0.138 0.1 617 55 2.3 0.414 0.373 0.041 0.0 637 56 2.3 0.414 0.373 0.041 0.0 656 57 2.7 0.486 0.474 0.012 0.0 661 1 of 2 105H- 001- ONSITE- PARCEL 3 Unit Hydrograph -24 Hr.xls 10/31/03 11:08 AM 58 2.6 0.468 0.421 59 2.5 0.450 0.405 60 2.4 0.432 0.389 61 2.3 0.414 0.373 62 1.9 0.342 0.308 63 1.9 0.342 0.308 64 0.4 0.072 0.065 65 0.4 0.072 0.065 66 0.3 0.054 0.049 67 0.3 0.054 0.049 68 0.5 0.090 0.081 69 0.5 0.090 0.081 70 0.5 0.090 0.081 71 0.4 0.072 0.065 72 0.4 0.072 0.065 73 0.4 0.072 0.065 74 0.3 0.054 0.049 75 0.2 0.036 0.032 76 0.3 0.054 0.049 77 0.4 0.072 0.065 78 0.3 0.054 0.049 79 0.2 0.036 0.032 80 0.3 0.054 0.049 81 0.3 0.054 0.049 82 , . 0.3 0.054 0.049 83 0.2 0.036 0.032 84 0.3 0.054 0.049 85' 0.2 0.036 0.032 86 0.3 0.054 0.049 87 0.2 0.036 0.032 88 0.3 0.054 0.049 89 0.2 0.036 0.032 90 0.2 0.036 0.032 91 0.2 0.036 0.032 92 0.2 0.036 0.032 93 0.2 0.036 0.032 94 0:2 0.036 0.032 95 0.2 0.036 0.032 96 0.2 0.036 0.032 Total Rain --- > Unit Time Period = 15 Min. * Point Rainfall 4.500 Pattern % Coef. 0.180 * Pery Loss Rate (Fp) 0.740. * Impery Area % 0.400 Adj. Loss Rate 0.474 * Trib Area (sf) 22,215 0.5 EFF. RAIN 0.463 Volume (cf) 857 2of2 0.047 0.0 0.045 0.0 0.043 0.0 0.041 0.0 0.034 0.0 0.034 0.0 0.007 0.0 0.007 0.0 0.005 0.0 0.005 0.0 0.009 0.0 0.009 0.0 0.009 0.0 0.007 0.0 0.007 0.0 0.007 0.0 0.005 0.0 0.004 0.0 0.005 0.0 0.007 0.0 0.005 0.0 0.004 0.0 0.005 0.0 0.005 0.0 0.005 0.0 0.004. 0.0 0.005 0.0 0.004 0.0 0.005 0.0 0.004 0.0 0.005 0.0 0.004 0.0 0.004 0.0 0.004 0.0 0.004 0.0 0.004 0.0 0.004 0.0 0.004 0.0 0.004 0.0 1.851 AC. 683 704 724 743 759 775 778 782 784 787 791 795 799 803 806 809 812 813 816 819 822 823 826 828 831 833 835 837 839 841 843 845 847 848 850 852 853 8S5 857