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II - 11�1'lll ■1�1� 1�11��11� I b6 31 L- ��_IIIIIIIIIIIIIIIIIIII _ ____j b, uz , PRELIMINARY HYDROLOGY & HYDRAULICS REPORT TENTATIVE TRACT 32119 TRANS WEST DEVELOPMENT, INC. Prepared For: Trans West Housing Inc. 9968 Hibert Street, Suite 102 San Diego, CA 92131 Contact: Rod Grinberg Prepared By: NAI Consulting 68 -955 Adelina Road Cathedral City, CA 92234 Prepared Under the Supervision of. .'� zjaijd'� Kris R. Schulze R.C.E. 46188 Expiration Date: 12/31/06 QROFESS /pN �4ZY Scy 1 CO No. 46188 m w Exp. 12/31/06 �F OF CA-\FW PROJECT DESCRIPTION: The purpose of this report is to provide preliminary hydrology calculations for Tentative Tract 32119, for Trans West Housing, Inc. in the City of La Quinta. The project consists of approximately 14.46 acres Iodated at the northeast corner of Fred Waring Drive and Washington Street in the City of La Quinta, California. This property is described as Parcel 2 of PM 31876. This study analyzes the retention requirements for the developed conditions for the proposed residential lots, Fred Waring Drive and Palm Royale Drive. For the purpose of this study, the proposed commercial property (10.02 acres) to the west is assumed to drain to the proposed retention basin. The proposed retention basin is sized to accommodate the developed run off from the controlling 100 year storm event. If the commercial property retains it's run off on site, the proposed basin will have additional freeboard for just the residential portion. Runoff modeling was performed under the guidelines of the Riverside County Flood Control and Water Conservations District Hydrology Manual (RCFCD). Retention basins were sized utilizing the Synthetic Unit Method for the 100 -year storm event. DESIGN CRITERIA: The following parameters were used: • Time of Concentration • 2 year — 1 hour precipitation • 100 year — 1 hour precipitation • Slope of Intensity Duration Curve • 2 year — 3 hour precipitation • 100 year — 3 hour precipitation • 2 year — 6 hour precipitation • 100 year — 6 hour precipitation • 2 year — 24 hour precipitation • 100 year — 24 hour precipitation • Soil Group `A' • Antecedent Moisture Condition II • Runoff Index = 32 0.60 1.60 0.59 0.70 2.00 0.80 2.50 1.10 4.25 Plate D -3 Plate D -4.3 Plate D -4.4 Plate D -4.6 Plate E -5.1 Plate E -5.2 Plate E -5.3 Plate E -5.4 Plate E -5.5 Plate E -5.6 RETENTION BASIN SIZING: Retention basins were sized utilizing the Synthetic Unit Hydrograph Method per RCFCD guidelines. A percolation factor of 1 inch per hour was used in the calculations. A standard drywell(s) are proposed for each retention basin assist in the handling of nuisance flows. Percolation at the drywells have been assumed to be zero. The tables shown on the attached hydrology maps summarize the results of the retention basin calculations. Each basin has been evaluated to contain the run off generated from the 3 hour, 6 hour or 24 hour, 100 year event (producing the greatest run off volume). In summary, the proposed retention basin as shown on the Tentative Tract Map is adequate to contain the runoff from the controlling 100 year storm event for the developed residential and commercial projects. A more detailed hydrology and hydraulic study will be presented for City review with the final design documents. The more detailed report will include hydraulic calculations for catch basins and storm drain systems as well as fine tuning the retention basin sizing, shapes and characteristics. A B C D 1 RCFCD SYNTHETIC UNIT HYDROGRAPH 2 DATA INPUT SHEET 3 _ 4 WORKSHEET PREPARED BY: jKRS 5 6 PROJECT NAME TRANSWEST 7 NAI JOB # 2002 704.04 8 9 CONCENTRATION POINT DESIGNATION RETENTION. BASIN 10 AREA DESIGNATION LOT 11 12 TRIBUTARY AREAS ACRES 13 14 COMMERCIAL 10.02 15 PAVING /HARDSCAPE 5.32' 16 SF - 1 ACRE 17 SF - 1/2 ACRE 18 SF - 1/4 ACRE 10.03 19 MF - CONDOMINIUMS 20 MF- APARTMENTS 21 MOBILE HOME PARK 22 LANDSCAPING 1:37 23 RETENTION BASIN 24 GOLF COURSE 25 MOUNTAINOUS :. 26 LOW LOSS RATE (PERCENT) 27 28 LENGTH OF WATERCOURSE (L) 254` 29 LENGTH TO POINT OPPOSITE CENTROID (Lca) I'25 30 31 ELEVATION OF HEADWATER ° 32 ELEVATION OF CONCENTRATION POINT 44 33 34 AVERAGE MANNINGS'N' VALUE 0.02 35 36 STORM FREQUENCY (YEAR) 100 37 38 POINT RAIN 39 3 -HOUR 2 40 6 -HOUR 2.5 41 24 -HOUR 4.5 42 43 BASIN CHARACTERISTICS: ELEVATION AREA 44 _ 124' .: 20330 45 _ 125:: 23050: 46 126..:: 47 _ 127 28700 48 128 '31650 _ 49 129 ` 34.700 _ 50 130 37830 51 _ _ — 52 _PERCOLATION RATE (in /hr) 1 53 54 DRYWELL DATA 55 NUMBER USED 1 56 PERCOLATION RATE cfs 0 - RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: TRANSWEST DURATION BASIC DATA CALCULATION FORM NAI JOB # 2002 -04.04 EFFECTIVE RAIN (in) 1.24 SHORTCUT METHOD BY KRS DATE 1!712004 109,133 2.51 133,244 3.06 PHYSICAL DATA 112,024 2.57 1.54 95,6981 2.20 1.81 101,044 2.32 1.71 [11 CONCENTRATION POINT PEAK FLOW Ids) 45.73 38.0211 RETENTION BASIN MAXIMUM WSEL (ft) [21 AREA DESIGNATION 127.74 1 .127.87 LOT [31 AREA - ACRES 26.740 4 L -FEET 254 5 L -MILES 0.048 6 La -FEET 125.00 La -MILES 0.024 8 ELEVATION OF HEADWATER 46.5 [91 ELEVATION OF CONCENTRATION POINT 44 10 H -FEET 2.5 11 S- FEET /MILE 52.0 [121 S 10.5 7.21 13 L'LCA/S ^0.5 0.000 [141 AVERAGE MANNINGS'N' 0.02 15 LAG TIME -HOURS 0.02 [161 LAG TIME - MINUTES 1.0 [171100% OF LAG- MINUTES 1.0 [181200% OF LAG- MINUTES 2.1 19 UNIT TIME - MINUTES 100 % -200% OF LAG 5 [24] TOTAL PERCOLATION RATE (cfs) 0.67 RAINFALL DATA [t] SOURCE [2] FREQUENCY -YEARS 100 [3] DURATION: 3 -HOURS 6 -HOURS 24 -HOURS [41 (5) [61 [7) [8] [9] [10] [11] [12] [13] [14] [15] POINT AREA AVERAGE POINT AREA AVERAGE POINT AREA AVERAGE RAIN POINT RAIN POINT RAIN POINT INCHES RAIN INCHES RAIN INCHES RAIN Plate E -5.2 INCHES Plate E -5.4 INCHES Plate E -5.6 INCHES 2.00 26.740 1.00 2.00 2.50 26.740 1.00 2.50 4.50 26.740 1.00 4.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SUM (5] 26.74 SUM [7] 2.00 SUM [9] 26.74 SUM [11] 2.50 SUM [13J 26.74 SUM [15] 4.50 [16] AREA ADJ FACTOR 1.000 1.000 1.000 [17] ADJ AVG POINT RAIN 2.00 2.50 4.50 STORM EVENT SUMMARY DURATION 3 -HOUR 6 -HOUR 24 -HOUR EFFECTIVE RAIN (in) 1.24 1.12 1.37 FLOOD VOLUME (cu -ft) (acre -ft) 120,047 2.76 109,133 2.51 133,244 3.06 REQUIRED STORAGE (cu -ft) (acre -ftj FACTOR OF SAFETY STORAGE PROVIDED (cu -ft) (acre -ft) 112,024 2.57 1.54 95,6981 2.20 1.81 101,044 2.32 1.71 173010 3.97 PEAK FLOW Ids) 45.73 38.0211 10.43 MAXIMUM WSEL (ft) 128.25 127.74 1 .127.87 3 HwIR EVF/JT Ccwr40LS /, 5Y F14 c roR of S4 FEiy MAX INS EL.EV= /29.2S Plate E -2.1 Page 1 of 1 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT TRANSWEST CONCENTRATION POINT: RETENTION BASIN BY KRS DATE 1!7/2004 DJUSTED LOSS RATE SOIL GROUP [Plate C -1] LAND USE RI NUMBER Plate E -6.1 PERVIOUS AREA INFILTRATION RATE (in /hr) Plate E -6.2 DECIMAL PERCENT OF AREA IMPERVIOUS Plate E -6.3 ADJUSTED INFILTRATION RATE (in /hr) AREA AVERAGE ADJUSTED INFILTRATION RATE (in /hr) A COMMERCIAL 32 0.74 90% 0.14 10.02 .0.375 0.0527 A PAVING /HARDSCAPE 32 0.74 100% 0.07 5.32 0.199 0.0147 A SF - 1 ACRE 32 0.74 20% 0.61 0.00 0.000 0.0000 A SF - 1/2 ACRE 32 0.74 40% 0.47 0.00 0.000 0.0000 A SF - 1/4 ACRE 32 0.74 50% 0.41 10.03 0.375 0.1527 A MF - CONDOMINIUMS 32 0.74 65% 0.31 0.00 0.000 0.0000 A MF - APARTMENTS 32 0.74 80% 0.21 0.00 0.000 0.0000 A MOBILE HOME PARKS 32 0.74 75% 0.24 0.00 0.000 0.0000 A LANDSCAPING 32 0.74 0% 0.74 1.37 0.051 0.0379 A RETENTION BASINS 32 0.74 0% 0.74 0.00 0.000 0.0000 A GOLF COURSE 32 0.74 0% 0.74 0.00 0.000 0.0000 D MOUNTAINOUS 93 0.95 90% 0.18 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 0.00 0.000 0.0000 VARIABLE LOSS RATE CURVE (24 -HOUR STORM ONLY) SUM 26.74 SUMI 0.2580 Fm= 0.128992184 C= 0.00239 Ft= C(24- (T /60)) ^1.55 = 0.00239 (24- (T /60)) ^1.55 + 0.13 in /hr LOW LOSS RATE (80 -90 PERCENT) = 90% Where: T =Time in minutes. To get an average value for each unit time period, Use T =1/2 the unit time for the first time period, T =1 1/2 unit time for the second period, etc. Plate E -2.1 Page 1 of 1 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD 100 YEAR - 3 HOUR STORM EVENT PROJECT: TRANSWEST CONCENTRATION POINT: RETENTION BASIN BY: KRS DATE 1!712004 EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 26.74 UNIT TIME - MINUTES 5 LAG TIME - MINUTES 1.03 UNIT TIME - PERCENT OF LAG 483.2 TOTAL ADJUSTED STORM RAIN- INCHES 2.00 CONSTANT LOSS RATE -in /hr 0.26 LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.67 cfs Unit Time Period Time Minutes Hours Pattern Percent Plate E -5.9 Storm Rain in /hr Loss Rate in /hr Max Low Effective Rain in /hr Flood Hydrograph Flow cfs Required Storage cf 1 5 0.08 1.3 0.312 0.26 0.28 0.05 1.44 231.37 2 10 0.17 1.3 0.312 0.26 0.28 0.05 1.44 231.37 3 15 0.25 1.1 0.264 0.26 0.24 0.01 0.16 0.00 4 20 0.33 1.5 0.360 0.26 0.32 0.10 2.73 616.42 5 25 0.42 1.5 0.360 0.26 0.32 0.10 2.73 616.42 6 30 0.50 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 7 35 0.58 1.5 0.360 0.26 0.32 0.10 2.73 616.42 8 40 0.67 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 9 45 0.75 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 10 50 0.83 1.5 0.360 0.26 0.32 0.10 2.73 616.42 11 55 0.92 1.6 0.384, 0.26 0.35 0.13 3.37 808.95 12 60 1.00 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 13 65 1.08 2.2 0.528 0.26 0.48 0.27 7.22 1964.12 14 70 1.17 2.2 0.528 0.26 0.48 0.27 7.22 1964.12 15 75 1.25 2.2 0.528 0.26 0.48 0.27 7.22 1964.12 16 80 1.33 2.0 0.480 0.26 0.43 0.22 5.94 1579.06 17 85 1.42 2.6 0.624 0.26 0.56 0.37 9.79 2734.23 18 90 1.50 2.7 0.648 0.26 0.58 0.39 10.43 2926.76 19 95 1.58 2.4 0.576 0.26 0.52 0.32 8.50 2349.18 20 100 1.67 2.7 0.648 0.26 0.58 0.39 10.43 2926.76 21 105 1.75 3.3 0.792 0.26 0.71 0.53 14.28 4081.93 22 110 1.83 3.1 0.744 0.26 0.67 0.49 13.00 3696.87 23 115 1.92 2.9 0.696 0.26 0.63 0.44 11.71 3311.82 24 120 2.00 3.0 0.720 0.26 0.65 0.46 12.35 3504.34 25 125 2.08 3.1 0.744 0.26 0.67 0.49 13.00 3696.87 26 130 2.17 4.2 1.008 0.26 0.91 0.75 20.06 5814.68 27 135 2.25 5.0 1.200 0.26 1.08 0.94 25.19 7354.90 28 140 2.33 3.5 0.840 0.26 0.76 0.58 15.56 4466.98 29 145 2.42 6.8 1.632 0.26 1.47 1.37 36.74 10820.41 30 150 2.50 7.3 1.752 0.26 1.58 1.49 39.95 11783.05 31 155 2.58 8.2 1.968 0.26 1.77 1.71 45.73 13515.80 32 160 2.67 5.9 1.416 0.26 1.27 1.16 30.97 9087.66 33 165 2.75 2.0 0.480 0.26 0.43 0.22 5.94 1579.06 34 170 2.83 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 35 175 2.92 1.8 0.432 0.26 0.39 0.17 4.65 1194.01 36 1 180 3.00 0.6 0.144 0.26 0.13 1 0.01 0.39 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) 1.24 FLOOD VOLUME (acft) 2.76 FLOOD VOLUME (tuft). 120046.66 REQUIRED STORAGE (acft) 2.57 REQUIRED STORAGE (cult) 112024.19 PEAK FLOW RATE (cfs) 45.73 Plate E -2.2 Page 1 of 1 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: TRANSWEST 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: RETENTION BASIN BY: KRS DATE: 1/7/2004 EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 26.74 UNIT TIME - MINUTES 5 LAG TIME - MINUTES 1.03 UNIT TIME - PERCENT OF LAG 483.2 TOTAL ADJUSTED STORM RAIN- INCHES 2.50 CONSTANT LOSS RATE -in /hr 0.258 LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.67 cfs Unit Time Time Pattern Storm Loss Rate Effective Flood Required Period Minutes Hours Percent Rain Rain Hydrograph Storage in /hr in /hr Flow Plate E -5.9 Max Low in /hr cfs cf 1 5 0.08 0.5 0.150 0.26 0.14 0.02 0.40 0.00 2 10 0.17 0.6 0.180 0.26 0.16 0.02 0.48 0.00 3 15 0.25 0.6 0.180 0.26 0.16 0.02 0.48 0.00 4 20 0.33 0.6 0.180 0.26 0.16 0.02 0.48 0.00 5 25 0.42 0.6 0.180 0.26 0.16 0.02 0.48 0.00 6 30 0.50 0.7 0.210 0.26 0.19 0.02 0.56 0.00 7 35 0.58 0.7 0.210 0.26 0.19 0.02 0.56 0.00 8 40 0.67 0.7 0.210 0.26 0.19 0.02 0.56 0.00 9 45 0.75 0.7 0.210 0.26 0.19 0.02 0.56 0.00 10 50 0.83 0.7 0.210 0.26 0.19 0.02 0.56 0.00 11 55 0.92 0.7 0.210 0.26 0.19 0.02 0.56 0.00 12 60 1.00 0.8 0.240 0.26 0.22 0.02 0.64 0.00 13 65 1.08 0.8 0.240 0.26 0.22 0.02 0.64 0.00 14 70 1.17 0.8 0.240 0.26 0.22 0.02 0.64 0.00 15 75 1.25 0.8 0.240 0.26 0.22 0.02 0.64 0.00 16 80 1.33 0.8 0.240 0.26 0.22 0.02 0.64 0.00 17 85 1.42 0.8 0.240 0.26 0.22 0.02 0.64 0.00 is 90 1.50 0.8 0.240 0.26 0.22 0.02 0.64 0.00 19 95 1.58 0.8 0.240 0.26 0.22 0.02 0.64 0.00 20 100 1.67 0.8 0.240 0.26 0.22 0.02 0.64 0.00 21 105 1.75 0.8 0.240 0.26 0.22 0.02 0.64 0.00 22 110 1.83 0.8 0.240 0.26 0.22 0.02 0.64 0.00 23 115 1.92 0.8 0.240 0.26 0.22 0.02 0.64 0.00 24 120 2.00 0.9 0.270 0.26 0.24 0.01 0.32 0.00 25 125 2.08 0.8 0.240 0.26 0.22 0.02 0.64 0.00 26 130 2.17 0.9 0.270 0.26 0.24 0.01 0.32 0.00 27 135 2.25 0.9 0.270 0.26 0.24 0.01 0.32 0.00 28 140 2.33 0.9 0.270 0.26 0.24 0.01 0.32 0.00 29 145 2.42 0.9 0.270 0.26 0.24 0.01 0.32 0.00 30 150 2.50 0.9 0.270 0.26 0.24 0.01 0.32 0.00 31 155 2.58 0.9 0.270 0.26 0.24 0.01 0.32 0.00 32 160 2.67 0.9 0.270 0.26 0.24 0.01 0.32 0.00 33 165 2.75 1.0 0.300 0.26 0.27 0.04 1.12 135.10 34 170 2.83 1.0 0.300 0.26 0.27 0.04 1.12 135.10 35 175 2.92 1.0 0.300 0.26 0.27 0.04 1.12 135.10 36 180 3.00 1.0 0.300 0.26 0.27 0.04 1.12 135.10 37 185 3.08 1.0 0.300 0.26 0.27 0.04 1.12 135.10 38 190 3.17 1.1 0.330 0.26 0.30 0.07 1.93 375.76 39 195 3.25 1.1 0.330 0.26 0.30 0.07 1.93 375.76 40 200 3.33 1.1 0.330 0.26 0.30 0.07 1.93 375.76 41 205 3.42 1.2 0.360 0.26 0.32 0.10 2.73 616.42 42 210 3.50 1.3 0.390 0.26 0.35 0.13 3.53 857.08 43 215 3.58 1.4 0.420 0.26 0.38 0.16 4.33 1097.74 44 220 3.67 1.4 0.420 0.26 0.38 0.16 4.33 1097.74 45 225 3.75 1.5 0.450 0.26 0.41 0.19 5.13 1338.40 46 230 3.83 1.5 0.450 0.26 0.41 0.19 5.13 1338.40 47 235 3.92 1.6 0.480 0.26 0.43 0.22 5.94 1579.06 48 240 4.00 1.6 0.480 0.26 0.43 0.22 5.94 1579.06 49 245 4.08 1.7 0.510 0.26 0.46 0.25 6.74 1819.72 50 250 4.17 1.8 0.540 0.26 0.49 0.28 7.54 2060.38 51 255 4.25 1.9 0.570 0.26 0.51 0.31 8.34 2301.04 52 260 4.33 2.0 0.600 0.26 0.54 0.34 9.15 2541.70 53 265 4.42 2.1 0.630 0.26 0.57 0.37 9.95 2782.36 54 270 4.50 2.1 0.630 0.26 0.57 0.37 9.95 2782.36 55 275 4.58 2.2 0.660 0.26 0.59 0.40 10.75 3023.02 56 280 4.67 2.3 0.690 0.26 0.62 0.43 11.55 3263.68 Plate E -2.2 Page 1 of 2 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: TRANSWEST 100 YEAR - 6 HOUR STORM EVENT CONCENTRATION POINT: RETENTION BASIN BY: KRS DATE: 117/2004 EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 26.74 UNIT TIME - MINUTES 5 LAG TIME - MINUTES 1.03 UNIT TIME - PERCENT OF LAG 483.2 TOTAL ADJUSTED STORM RAIN- INCHES 2.50 CONSTANT LOSS RATE -in /hr 0.258 LOW LOSS RATE - PERCENT 90% TOTAL PERCOLATION RATE (cfs) 0.67 cfs Unit Time Time Pattern Storm Loss Rate Effective Flood Required Period Minutes Hours Percent Rain Rain Hydrograph Storage in /hr in/hr Flow Plate E -5.9 Max Low in /hr cfs cf 57 285 4.75 2.4 0.720 0.26 0.65 0.46 12.35 3504.34 58 290 4.83 2.4 0.720 0.26 0.65 0.46 12.35 3504.34 59 295 4.92 2.5 0.750 0.26 0.68 0.49 13.16 3745.00 60 300 5.00 2.6 0.780 0.26 0.70 0.52 13.96 3985.66 61 305 5.08 3.1 0.930 0.26 0.84 0.67 17.97 5188.96 62 310 5.17 3.6 1.080 0.26 0.97 0.82 21.98 6392.26 63 315 5.25 3.9 1.170 0.26 1.05 0.91 24.39 7114.24 64 320 5.33 4.2 1.260 0.26 1.13 1.00 26.79 7836.22 65 325 5.42 47 1.410 0.26 1.27 1.15 30.80 9039.52 66 330 5.50 5.6 1.680 0.26 1.51 1.42 38.02 11205.46 67 335 5.58 1.9 0.570 0.26 0.51 0.31 8.34 2301.04 68 340 5.67 0.9 0.270 0.26 0.24 0.01 0.32 0.00 69 345 5.75 0.6 0.180 0.26 0.16 0.02 0.48 0.00 70 350 5.83 0.5 0.150 0.26 0.14 0.02 0.40 0.00 71 1 355 5.92 0.3 0.090 0.26 0.08 0.01 0.24 0.00 72 1 360 6.00 0.2 0.060 0.26 0.05 1 0.01 0.16 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) 1.12 FLOOD VOLUME (acft) 2.51 FLOOD VOLUME (cuft) 109132.66 REQUIRED STORAGE (acft) 2.20 REQUIRED STORAGE (cuft) 95698.15 PEAK FLOW RATE (cfs) 38.02 Plate E -2.2 Page 2 of 2 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: TRANSWEST 100 YEAR - 24 HOUR STORM EVENT CONCENTRATION POINT: RETENTION BASIN BY: KRS DATE: 117/2004 EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 26.740 CONSTANT LOSS RATE -in /hr n/a UNIT TIME - MINUTES 15 VARIABLE LOSS RATE (AVG) in /hr 0.2580 LAG TIME - MINUTES 1.03 MINIMUM LOSS RATE (for var. loss) - in /hr 0.129 UNIT TIME - PERCENT OF LAG 1449.5 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN - INCHES 4.50 C 0.00239 PERCOLATION RATE cfs 0.67 Unit Time Time Pattern Storm Loss Rate Effective Flood Required Period Minutes Hours Percent Rain Rain Hydrograph Storage in /hr in /hr Flow Plate E -5.9 Max Low in /hr cfs cf 1 15 0.25 0.2 0.036 0.456 0.032 0.004 0.10 0.00 2 30 0.50 0.3 0.054 0.450 0.049 0.005 0.14 0.00 3 45 0.75 0.3 0.054 0.445 0.049 0.005 0.14 0.00 4 60 1.00 0.4 0.072 0.440 0.065 0.007 0.19 0.00 5 75 1.25 0.3 0.054 0.435 0.049 0.005 0.14 0.00 6 90 1.50 0.3 0.054 0.429 0.049 0.005 0.14 0.00 7 105 1.75 0.3 0.054 0.424 0.049 0.005 0.14 0.00 8 120 2.00 0.4 0.072 0.419 0.065 0.007 0.19 0.00 9 135 2.25 0.4 0.072 0.414 0.065 0.007 0.19 0.00 10 150 2.50 0.4 0.072 0.409 0.065 0.007 0.19 0.00 11 165 2.75 0.5 0.090 0.404 0.081 0.009 0.24 0.00 12 180 3.00 0.5 0.090 0.399 0.081 0.009 0.24 0.00 13 195 3.25 0.5 0.090 0.394 0.081 0.009 0.24 0.00 14 210 3.50 0.5 0.090 0.389 0.081 0.009 0. Z4 0.00 15 225 3.75 0.5 0.090 0.384 0.081 0.009 0.24 0.00 16 240 4.00 0.6 0.108 0.380 0.097 0.011 0.29 0.00 17 255 4.25 0.6 6108 0.375 0.097 0.011 0.29 0.00 18 270 4.50 0.7 0.126 0.370 0.113 0.013 0.34 0.00 19 285 4.75 0.7 0.126 0.365 0.113 0.013 0.34 0.00 20 300 5.00 0.8 0.144 0.361 0.130 0.014 0.39 0.00 21 315 5.25 0.6 0.108 0.356 0.097 0.011 0.29 0.00 22 330 5.50 0.7 0.126 0.351 0.113 0.013 0.34 0.00 23 345 5.75 0.8 0.144 0.347 0.130 0.014 0.39 0.00 24 360 6.00 0.8 0.144 0.342 0.130 0.014 0.39 0.00 25 375 6.25 0.9 0.162 0.338 0.146 0.016 0.43 0.00 26 390 6.50 0.9 0.162 1 0.333 0.146 0.016 0.43 0.00 27 405 6.75 1.0 0.180 0.329 0.162 0.018 0.48 0.00 28 420 7.00 1.0 0.180 0.324 0.162 0.018 0.48 0.00 29 435 7.25 1.0 0.180 0.320 0.162 0.018 0.48 0.00 30 450 7.50 1.1 0.198 0.315 0.178 0.020 0.53 0.00 31 465 7.75 1.2 0.216 0.311 0.194 0.022 0.58 0.00 32 480 8.00 1.3 0.234 0.307 0.211 0.023 0.63 0.00 33 495 8.25 1.5 0.270 0.302 0.243 0.027 0.72 43.95 34 510 8.50 1.5 0.270 0.298 0.243 0.027 0.72 43.95 35 525 8.75 1.6 0.288 0.294 0.259 0.029 0.77 87.27 36 540 9.00 1.7 0.306 0.290 0.275 0.016 0.43 0.00 37 555 9.25 1.9 0.342 0.286 0.308 0.056 1.50 745.72 38 570 9.50 2.0 0.360 0.282 0.324 0.078 2.09 1276.78 39 585 9.75 2.1 0.378 0.278 0.340 0.100 2.68 1806.93 40 600 10.00 2.2 0.396 0.274 0.356 0.122 3.27 2336.16 41 615 10.25 1.5 0.270 0.270 0.243 0.000 0.01 0.00 42 630 10.50 1.5 0.270 0.266 0.243 0.004 0.11 0.00 43 645 10.75 2.0 0.360 0.262 0.324 0.098 2.62 1752.28 44 660 11.00 2.0 0.360 0.258 0.324 0.102 2.72 1844.55 45 675 11.25 1.9 0.342 0.254 0.308 0.088 2.34 1502.67 46 690 11.50 1.9 0.342 0.251 0.308 0.091 2.44 1593.01 47 705 11.75 1.7 0.306 0.247 0.275 0.059 1.58 816.00 48 720 12.00 1.8 0.324 0.243 0.292 0.081 2.16 1337.56 49 735 12.25 2.5 0.450 0.240 0.405 0.210 5.63 4457.25 50 750 12.50 2.6 0.468 0.236 0.421 0.232 6.20 4976.81 51 765 12.75 2.8 0.504 0.232 0.454 0.272 7.26 5928.54 52 780 13.00 2.9 0.522 0.229 0.470 0.293 7.84 6446.05 53 795 13.25 3.4 0.612 0.226 0.551 0.386 10.33 8695.29 54 810 13.50 3.4 0.612 0.222 0.551 0.390 10.43 1 8777.53 55 825 13.75 2.3 0.414 0.219 0.373 0.195 5.22 4093.66 56 840 14.00 2.3 1 0.414 0.215 0.373 0.199 5.31 4173.78 57 855 14.25 2.7 0.486 0.212 0.437 0.274 7.32 5985.57 58 870 14.50 2.6 0.468 0.209 0.421 0.259 6.93 5630.32 59 885 14.75 2.6 0.468 0.206 0.421 0.262 7.01 5707.17 60 900 15.00 2.5 0.450 0.203 0.405 0.247 6.62 5349.70 61 915 15.25 2.4 0.432 0.199 0.389 1 0.233 6.22 4991.10 Plate E -2.2 Page 1 of 2 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: TRANSWEST 100 YEAR - 24 HOUR STORM *EVENT CONCENTRATION POINT: RETENTION BASIN 3.06 BY: KRS DATE: 117/2004 EFFECTIVE RAIN'CALCULATION FORM DRAINAGE AREA -ACRES 26.740 CONSTANT LOSS RATE -in /hr n/a UNIT TIME - MINUTES 15 VARIABLE LOSS RATE (AVG) in /hr 0.2580 LAG TIME - MINUTES 1.03 MINIMUM LOSS RATE (for var. loss) - in /hr 0.129 UNIT TIME - PERCENT OF LAG 1449.5 LOW LOSS RATE - DECIMAL 0.90 TOTAL ADJUSTED STORM RAIN - INCHES 4.50 C 0.00239 PERCOLATION RATE cfs 0.67 Unit Time Time Pattern Storm Loss Rate Effective Required Period Minutes Hours Percent Rain Rain - Hydrograph Storage in /hr in/hr Flow Plate E -5.9 Max Low in /hr cfs cf 62 930 15.50 2.3 0.414 0.196 0.373 0.218 5.82 4631.35 63 945 15.75 1.9 0.342 0.193 0.308 0.149 3.97 2970.88 64 1 960 16.00 1.9 0.342 0.190 0.308 0.152 4.05 3041.99 65 975 16.25 0.4 0.072 0.188 0.065 0.007 0.19 0.00 66 990 16.50 0.4 0.072 0.185 0.065 0.007 0.19 0400 67 1005 16.75 0.3 0.054 0.182 0.049 0.005 0.14 0.00 68 1020 17.00 0.3 0.054 0.179 0.049 0.005 0.14 0.00 69 1035 17.25 0.5 0.090 0.176 0.081 0.009 0.24 0.00 70 1050 17.50 0.5 0.090 0.174 0.081 0.009 0.24 0.00 71 1065 17.75 0.5 0.090 0.171 0.081 0.009 0.24 0.00 72 1080 18.00 0.4 0.072 0.169 0.065 0.007 0.19 0.00 73 1095 18.25 0.4 0.072 0.166 0.065 0.007 0.19 0.00 74 1110 18.50 0.4 0.072 0.164 0.065 0.007 0.19 0.00 75 1125 18.75 0.3 0.054 0.161 0.049 0.005 0.14 0.00 76 1140 19.00 0.2 0.036 0.159 0.032 0.004 0.10 0.00 77 1155 19.25 0.3 0.054 0.157 0.049 0.005 0.14 0.00 78 1170 19.50 0.4 0.072 0.155 0.065 0.007 0.19 0.00 79 1185 19.75 0.3 0.054 0.153 0.049 0.005 0.14 0.00 80 1200 20.00 0.2 0.036 0.150 0.032 0.004 0.10 0.00 81 1215 20.25 0.3 0.054 1 0.148 0.049 0.005 0.14 0.00 82 1230 20.50 0.3 0.054 0.147 0.049 0.005 0.14 0.00 83 1245 20.75 0.3 0.054 0.145 0.049 0.005 0.14 0.00 84 1260 21.00 0.2 0.036 0.143 0.032 0.004 0.10 0.00 85 1275 21.25 0.3 0.054 0.141 0.049 0.005 0.14 0.00 86 1290 21.50 0.2 0.036 0.140 0.032 0.004 0.10 0.00 87 1305 21.75 0.3 0.054 0.138 0.049 0.005 0.14 0.00 88 1320 22.00 0.2 0.036 0.137 0.032 0.004 0.10 0.00 89 1335 22.25 0.3 0.054 0.135 0.049 0.005 0.14 0.00 90 1 1350 22.50 0.2 0.036 0.134 0.032 0.004 0.10 0.00 91 1365 22.75 0.2 0.036 0.133 0.032 0.004 0.10 0.00 92 1380 23.00 002 0.036 0.132 0.032 0.004 0.10 0.00 93 1395 23.25 0.2 0.036 0.131 0.032 0.004 0.10 0.00 94 1410 23.50 0.2 0.036 0.130 0.032 0.004 0.10 0.00 95 1425 23.75 0.2 1 0.036 0.130 0.032 0.004 0.10 0.00 96 1440 24.00 1 0.2 0.036 1 0.129 1 0.032 1 0.004 0.10 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) 1.37 FLOOD VOLUME (acft) 3.06 FLOOD VOLUME (cuft) 133243.76 REQUIRED STORAGE (acft) 2.32 REQUIRED STORAGE (cult) 101043.81 PEAK FLOW cfs 10.43 Plate E -2.2 Page 2 of 2 PROJECT: ' TRANSWEST NAI JOB # 2002 -04.04 RETENTION BASIN BASIN CHARACTERISTICS CONTOUR I DEPTH AREA VOLUME INCR TOTAL INCR TOTAL INCR TOTAL (ft) (ft) (sf) (sf) (cuft) (cuft) (acre -ft) 124 0 0 20330 0 0 0.00 125 1 1 2720 23050 21690 21690 0.50 126 1 2 2780 25830 24440 46130 1.06 127 1 3 2870 28700 27265 73395 1.68 128 1 4 2950 31650 30175 103570 2.38 129 1 5 3050 34700 33175 136745 3.14 130 1 1 6 1 3130 37830 36265 173010 3.97 PERCOLATION CALCULATIONS PERCOLATION RATE 1 in /hr 0.67 cfs MAXWELL IV DRYWELLS NUMBER USED 1 RATE /DRYWELL 0 cfs TOTAL DISSIPATED 0 cfs TOTAL PERCOLATION RATE 0.67 cfs Basin Characteristics Page 1 of 1 TRANSWEST NAI JOB # 2002 -04.04 100 YEAR - 3 HOl1R STORM FVFNT TIME UNIT (min) PERIOD FLOW IN cfs VOLUME IN cult) TOTAL IN BASIN cult PERC OUT cult) TOTAL IN BASIN cult) BASIN DEPTH (ft) BALANCE IN BASIN (cult) acre -ft) 1 5 1.44 433 433 202 231 124.01 231 0.01 2 10 1.44 433 665 202 463 124.02 463 0.01 3 15 0.16 48 511 1 202 309 124.01 309 0.01 4 20 2.73 818 1,127 202 925 124.04 925 0.02 5 25 2.73 818 1,744 202 1,542 124.07 1,542 0.04 6 30 4.65 1,396 2,938 202 2,736 124.13 2,736 0.06 7 35 2.73 818 3,554 202 3,352 124.15 3,352 0.08 8 40 4.65 1,396 4,748 202 4,546 124.21 4,546 0.10 9 45 4.65 1,396 5,942 202 5,740 124.26 5,740 0.13 10 50 2.73 818 6,559 202 6,357 124.29 6,357 0.15 11 55 3.37 1,011 7,368 202 7,166 124.33 7,166 0.16 12 60 4.65 1,396 8,562 202 8,360 124.39 8,360 0.19 13 65 7.22 2,166 10,526 202 10,324 124.48 10,324 0.24 14 70 7.22 2,166 12,490 202 12,288 124.57 12,288 0.28 15 75 7.22 2,166 14,454 202 14,252 124.66 14,252 0.33 16 80 5.94 1,781 16,033 202 15,831 124.73 15,831 0.36 17 85 9.79 2,936 18,767 202 18,565 124.86 18,565 1 0.43 18 90 10.43 3,129 21,694 2021 21,492 124.99 21,492 0.49 19 95 8.50 2,551 24,043 202 23,841 125.09 23,841 0.55 20 100 10.43 3,129 26,970 202 26,768 125.21 26,768 0.61 21 105 14.28 4,284 31,052 202 30;850 125.37 30,850 0.71 22 110 13.00 3,899 34,749 202 34,547 125.53 34,547 0.79 23 115 11.71 3,514 38,061 202 37,859 125.66 37,859 0.87 24 120 12.35 3,706 41,565 2021 41,363 125.80 41,363 0.95 25 125 13.00 3,899 45,262 202 45,060 125.96 45,060 1.03 26 130 20.06 6,017 51,077 202 50,875 126.17 50,875 1.17 27 135 25.19 7,557 58,431 202 58,230 126.44 58,230 1.34 28 140 15.56 4,669 62,898 202 62,697 126.61 62,697 1.44 29 145 36.74 11,022 73,719 202 73,517 127.00 73,517 1.69 30 150 39.95 11,985 85,502 202 85,300 127.39 85,300 1.96 31 155 45.73 13,718 99,018 202 98,816 127.84 98,816 2.27 32 160 30.97 9,290 108,105 202 107,903 128.13 107,903 2.48 33 165 5.94 1,781 109,684 202 109,482 128.18 109,482 2.51 34 170 4.65 1,396 110,878 202 110,676 1 128.21 110,676 2.54 35 175 4.65 1,396 112,072 1 202 111,871 128.25 111,871 2.57 36 11 180 0.39 116 111,986 202 111,784 128.25 111,784 2.57 Basin Depth Analysis Page 1 of 1 TRANSWEST NAI JOB # 2002 -04.04 100 YEAR - 6 HOUR STORM FVFNT TIME FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN BALANCE IN UNIT (min) IN IN BASIN OUT BASIN DEPTH BASIN PERIOD cfs) cult (cult) cult) (cuft) (ft) cult) (acre -ft) 1 5 0.40 120 120 202 - 124.00 - 0.00 2 10 0.48 144 144 202 - 124.00 - 0.00 3 15 0.48 144 144 2021 124.00 - 0.00 4 20 0.48 144 144 202 - 124.00 - 0.00 5 25 0.48 144 144 202 - 124.00 - 0.00 6 30 0.56 168 168 202 - 124.00 - 0.00 7 35 0.56 168 168 202 - 124.00 - 0.00 8 40 0.56 168 168 202 - 124.00 - 0.00 9 45 0.56 168 168 202 - 124.00 - 0.00 10 50 0.56 168 168 202 - 124.00 - 0.00 11 55 0.56 168 168 202 - 124.00 - 0.00 12 60 0.64 193 193 202 - 124.00 - 0.00 13 65 0.64 193 193 202 - 124.00 - 0.00 14 70 0.64 193 193 202 - 124.00 - 0.00 15 75 0.64 193 193 202 - 124.00 - 0.00 16 80 0.64 193 193 202 - 124.00 - 0.00 17 85 0.64 193 193 202 - 124.00 - 0.00 18 90 0.64 193 193 202 - 124.00 - 0.00 19 95 0.64 193 193 202 - 124.00 - 0.00 20 100 0.64 193 193 202 - 124.00 - 0.00 21 105 0.64 193 193 202 - 124.00 - 0.00 22 110 0.64 193 193 202 - 124.00 - 0.00 23 115 0.64 193 193 202 - 124.00 - 0.00 24 120 0.32 96 96 202 - 124.00 - 0.00 25 125 0.64 193 193 202 - 124.00 - 0.00 26 130 0.32 96 96 202 - 124.00 - 0.00 27 135 0.32 96 96 202 - 124.00 - 0.00 28 140 0.32 96 96 202 - 124.00 - 0.00 29 145 0.32 96 96 202 - 124.00 - 0.00 30 150 0.32 96 96 202 - 124.00 - 0.00 31 155 0.32 96 96 202 - 124.00 - 0.00 32 160 0.32 96 96 202 - 124.00 - 0.00 33 165 1.12 337 337 202 135 124.01 135 0.00 34 170 1.12 337 472 2021 270 124.01 270 0.01 35 175 1.12 337 607 2021 405 124.02 405 0.01 36 180 1.12 337 742 2021 540 124.02 540 0.01 37 185 1.12 337 877 202 676 124.03 676 0.02 38 190 1.93 578 1,253 202 1,051 124.05 1,051 0.02 39 195 1.93 578 1,629 202 1,427 124.07 1,427 0.03 40 200 1.93 578 2,005 202 1,803 124.08 1,803 0.04 41 205 2.73 818 2,621 1 202 2,419 124.11 2,419 0.06 42 210 3.53 1,059 3,478 2021 3,276 124.15 3,276 0.08 43 215 4.33 1,300 4,576 2021 4,374 124.20 4,374 0.10 44 220 4.33 1,300 5,674 2021 5,472 124.25 5,472 0.13 45 225 5.13 1,540 7,012 202 6,810 7 24.31 6,810 0.16 46 230 5.13 1,540 8,351 202 8,149 124.38 8,149 0.19 47 235 5.94 1,781 9,930 202 9,728 124.45 9,728 0.22 48 240 5.94 1,781 11,509 202 11,307 124.52 11,307 0.26 49 245 6.74 2,022 13,328 202 13,126 124.61 13,126 0.30 50 250 7.54 2,262 15,389 202 15,187 124.70 15,187 0.35 51 255 8.34 2,503 17,690 202 17,488 124.81 17,488 0.40 52 260 9.15 2,744 20,232 202 20,030 124.92 20,030 0.46 53 265 9.95 2,984 23,014 202 22,812 125.05 22,812 0.52 54 270 9.95 2,984 25,796 202 25,594 125.16 25,594 0.59 55 275 10.75 3,225 28,819 202 28,617 125.28 28,617 0.66 Basin Depth Analysis Page 1 of 2 TRANSWEST NAI JOB # 2002 -04.04 100 YEAR - 6 HCH IR RTnRnn GvFAIT TIME FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN BALANCE IN UNIT (min) IN IN BASIN OUT BASIN DEPTH BASIN PERIOD cfs cult (cuft) (cuft) (cuft) (ft) (cuft) (acre -ft) 56 280 11.55 3,466 32,083 202 31,881 125.42 31,881 0.73 57 285 12.35 3,706 35,587 202 35,385 125.56 35,385 0.81 58 290 12.35 3,706 39,092 202 38,890 125.70 38,890 0.89 59 295 13.16 3,947 42,837 2021 42,635 125.86 42,635 0.98 60 300 13.96 4,188 46,822 202 46,620 126.02 46,620 1.07 61 305 17.97 5,391 52,011 202 51,809 126.21 51,809 1.19 62 310 21.98 6,594 58,404 202 58,202 126.44 58,202 1.34 63 315 24.39 7,316 65,518 202 65,316 126.70 65,316 1.50 64 320 26.79 8,038 73,354 202 73,152 126.99 73,152 1.68 65 325 30.80 9,241 82,394 2021 82,192 127.29 82,192 1.89 66 330 38.02 11,407 93,599 202 93,397 127.66 93,397 2.14 67 335 8.34 2,503 95,900 202 95,698 127.74 95,698 2.20 68 340 0.32 96 95,795 202 95,593 127.74 95,593 2.19 69 345 0.48 144 95,737 202 95,535 127.73 95,535 2.19 70 350 0.40 120 95,655 202 95,453 127.73 95,453 2.19 71 355 0.24 72 95,526 202 95,324 127.73 95,324 2.19 72 360 0.16 48 95,372 202 95,170 127.72 1 95,170 2.18 Basin Depth Analysis Page 2 of 2 TRANSWEST NAI JOB # 2002 -04.04 100 YEAR - 24 Hn11R STnPU FvFtiT TIME FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN BALANCE IN UNIT (min) IN IN BASIN OUT BASIN DEPTH BASIN PERIOD cfs cult cuff cult) cult ft cult acre -ft 1 15 0.10 87 87 606 - 124.00 - 0.00 2 30 0.14 130 130 606 - 124.00 - 0.00 3 45 0.14 130 130 606 - 124.00 - 0.00 4 60 0.19 173 173 606 - 124.00 - 0.00 5 75 0.14 130 130 606 - 124.00 - 0.00 6 90 0.14 130 130 606 - 124.00 - 0.00 7 105 0.14 130 130 606 - 124.00 - 0.00 8 120 0.19 173 173 606 124.00 - 0.00 9 135 0.19 173 606 - 124.00 - 0.00 10 150 0.19 173 606 124.00 - 0.00 11 165 0.24 217 606 - 124.00 - 0.00 12 180 0.24 217 606 - 124.00 - 0.00 13 195 0.24 217 A260 606 - 124.00 - 0.00 14 210 0.24 217 606 - 124.00 - 0.00 15 225 0.24 217 606 - 124.00 - 0.00 16 240 0.29 260 606 124.00 0.00 17 255 0.29 260 606 - 124.00 - 0.00 18 270 0.34 303 303 606 124.00 0.00 19 285 0.34 303 303 606 - 124.00 - 0.00 20 300 0.39 347 347 606 - 124.00 - 0.00 21 315 0.29 260 260 606 124.00 - 0.00 22 330 0.34 303 303 606 - 124.00 - 0.00 23 345 0.39 347 347 606 - 124.00 - 0.00 24 360 0.39 347 347 606 - 124.00 - 1 0.00 25 375 0.43 390 390 606 - 124.00 - 0.00 26 390 0.43 390 390 606 - 124.00 0.00 27 405 0.48 433 433 606 - 124.00 - 0.00 28 420 0.48 433 433 606 - 124.00 0.00 29 435 0.48 433 433 606 - 124.00 - 0.00 30 450 0.53 477 477 606 - 124.00 - 0.00 31 465 0.58 520 520 606 - 124.00 - 0.00 32 480 0.63 563 563 606 - 124.00 - 0.00 33 495 0.72 650 650 606 44 124.00 44 0.00 34 510 0.72 650 694 606 88 124.00 88 0.00 35 525 0.77 693 781 606 175 124.01 175 0.00 36 540 0.43 386 562 606 - 124.00 - 0.00 37 555 1.50 1,352 1,352 606 746 124.03 746 0.02 38 570 2.09 1,883 2,628 606 2,023 124.09 2,023 0.05 39 585 2.68 2,413 4,435 606 3,829 124.18 3,829 0.09 40 600 3.27 2,942 6,771 606 6,166 124.28 6,166 0.14 41 615 0.01 5 6,170 606 5,565 124.26 5,565 0.13 42 630 0.11 99 5,663 606 5,058 124.23 5,058 0.12 43 645 2.62 2,358 7,416 606 6,810 124.31 6,810 0.16 44 660 2.72 2,450 9,260 606 8,654 124.40 8,654 0.20 45 675 2.34 2,109 10,763 606 10,157 124.47 10,157 0.23 46 690 2.44 2,199 12,356 606 11,750 124.54 11,750 0.27 47 705 1.58 1,422 13,172 1 606 12,566 124.58 12,566 0.29 48 720 2.16 1,943 14,510 606 13,904 124.64 13,904 0.32 49 735 5.63 5,063 18,967 606 18,361 124.85 18,361 0.42 50 750 6.20 5,583 23,944 606 23,338 125.07 23,338 0.54 51 765 7.26 6,534 29,872 606 29,266 125.31 29,266 0.67 52 780 7.84 7,052 36,318 606 35,712 125.57 35,712 0.82 53 795 10.33 9,301 45,013 606 44,408 125.93 44,408 1.02 54 810 10.43 9,383 53,791 606 53,185 126.26 53,185 1.22 55 825 5.22 4,699 57,885 606 57,279 126.41 57,279 1.31 56 840 5.31 4,780 62,058 606 61,453 126.56 61,453 1.41 57 855 7.32 6,591 68,044 606 67,438 126.78 67,438 1.55 58 870 6.93 6,236 73,674 6061 732069 126.99 73,069 1.68 Basin Depth Analysis Page 1 of 2 TRANSWEST NAI JOB # 2002 -04.04 100 YFAR - 94 Hni iR cTOPRA PVPKIT TIME FLOW VOLUME TOTAL IN PERC TOTAL IN BASIN BALANCE IN UNIT (min) IN IN BASIN OUT BASIN DEPTH BASIN PERIOD cfs cult cult cult cult ft cult acre -ft 59 885 7.01 6,313 79,382 606 78,776 127.18 78,776 1.81 60 900 6.62 5,956 84,731 606 84,125 127.36 84,125 1.93 61 915 6.22 5,597 89,722 606 89,116 127.52 89,116 2.05 62 930 5.82 5,237 94,354 606 93,748 127.67 93,748 2.15 63 945 3.97 3,577 97,325 606 96,719 127.77 96,719 2.22 64 960 4.05 3,648 100,367 606 99,761 127.87 99,761 2.29 65 975 0.19 173 99,934 606 99,328 127.86 99,328 2.28 66 990 0.19 173 99,501 606 98,896 127.85 98,896 2.27 67 1005 0.14 130 99,026 606 98,420 127.83 98,420 2.26 68 1020 0.14 130 98,550 606 97,944 127.81 97,944 2.25 69 1035 0.24 217 98,160 606 97,555 127.80 97,555 2.24 70 1050 0.24 217 97,771 606 97,165 127.79 97,165 2.23 71 1065 0.24 217 97,382 606 96,776 127.77 96,776 2.22 72 1080 0.19 173 96,949 606 96,344 127.76 96,344 2.21 73 1095 0.19 173 96,517 606 95,911 127.75 95,911 2.20 74 1110 0.19 173 96,084 606 95,478 127.73 95,478 2.19 75 1125 0.14 130 95,608 606 95,003 127.72 95,003 2.18 76 1140 0.10 87 95,089 606 94,483 127.70 94,483 2.17 77 1155 0.14 130 94,613 606 94,007 127.68 94,007 2.16 78 1170 0.19 173 94,181 606 93,575 127.67 93,575 2.15 79 1185 0.14 130 93,705 606 93,099 127.65 93,099 2.14 80 1200 0.10 87 93,186 606 92,580 127.64 92,580 2.13 81 1215 0.14 130 92,710 606 92,104 127.62 92,104 2.11 82 1230 0.14 130 92,234 1 606 91,628 127.60 91,628 2.10 83 1245 0.14 130 91,758 606 91,152 127.59 91,152 2.09 84 1260 0.10 87 91,239 606 90,633 127.57 90,633 2.08 85 1275 0.14 130 90,763 606 90,157 127.56 90,157 2.07 86 1290 0.10 87 90,244 606 89,638 127.54 89,638 2.06 87 1305 0.14 130 89,768 606 89,162 127.52 89,162 2.05 88 1320 0.10 87 89,249 606 88,643 127.51 88,643 2.03 89 1335 0.14 130 88,773 606 88,167 127.49 88,167 2.02 90 1350 0.10 87 88,254 606 87,648 127.47 87,648 2.01 91 1365 0.10 87 87,734 606 87,129 127.46 87,129 2.00 92 1380 0.10 87 87,215 606 86,609 127.44 86,609 1.99 93 1395 0.10 87 86,696 606 86,090 127.42 86,090 1.98 94 1410 0.10 87 86,177 606 85,571 127.40 85,571 1.96 95 1425 0.10 87 85,658 6061 85,052 127.39 85,052 1.95 96 1440 010 87 85,138 606 84,533 127.37 84,533 1.94 Basin Depth Analysis Page 2 of 2