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.- I 7 I Table 1. Design Rainfall. I Desiqn storm Distribution of 1-Hour NOAA Atlas Depth Time Percent of 1-Hour NOAA Rainfall Atlas Depth I (Minutes) 10-Yr. 50-Yr. 100-Yr. 500 Yr.' Table 2. Summary of Drainage Basin Parameters. I 5 2.0 1.3 1.0 10 3.7 3.5 3.0 SUBAREA 6UTTER MIDTH AREA PERCENT SlOPE RESISTANCE fACTOR SURfACE STORAGE(I") INfILTRATION RAIE(IN/HR) 15 8.7 5.0 4.6 IlIllBER 011 1WIlt00E (fT) (AC) IMPERV. (fT/fT) IMPERV. PERV. IMPERV. PERV. MAXIMUM MINIMUM DECAY RATE I 20 15.3 8.0 8.0 -1 0 1. .0 1.0 1. 0000 1. 000 1.000 1. 000 1. 000 1.00 1.00 1. 00000 25 25.0 15.0 14.0 1 1 1300. 56.0 6.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 30 13.0 25.0 25.0 2 2 4000. 232.0 28.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 35 5.8 12.0 14.0 3 3 5400. 115.0 31.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 I 40 4.4 8.0 8.0 4 4 4200. 99.0 32.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 45 3.6 5.0 6.2 5 5 SOOO. 112.0 17.0 .0200 .020 .200 .100 .300 3.00 .50 .00180 50 3.6 5.0 5.0 6 6 3450. 148.0 32.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 I 55 3.0 3.2 4.0 N/A' 7 7 1920. 117.0 33.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 60 3.0 3.2 4.0 8 8 2000. 38.0 35.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 65 3.0 3.2 4.0 9 9 3240. 87.0 40.0 .0200 .020 .200 .100 .300 3.00 .50 .00180 70 3.0 2.4 2.0 10 10 1800. 33.0 60.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 I 75 2.5 2.4 2.0 11 11 1260. 47.0 38.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 80 2.2 1.8 1.2 12 12 4200. 63.0 55.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 85 2.2 1.8 1.2 13 13 1300. 49.0 90.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 I 90 2.2 1.4 1.2 14 14 960. 33.0 70.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 95 2.2 1.4 1.2 15 15 1980. 31.0 85.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 100 1.5 1.4 1.2 16 16 1800. 38.0 83.0 .0100 .020 .200 .100 .300 3.75 .55 .00180 I 105 1.5 1.4 1.2 32 32 2600. 133.0 20.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 110 1.5 1.4 1.2 33 33 2200. 61.0 20.0 .0200 .010 .200 .100 .300 3.00 .50 .00180 115 1.5 1.4 1.2 34 34 3080. 63.0 36.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 120 1.3 1.4 1.2 35 35 2300. 148.0 50.0 .0100 .020 .200 .100 .300 3.00 .50 .00180 I 36 36 3200. 112.0 35.0 .0100 .020 .200 .100 ,300 3.00 .S{) .00180 Totals 115.7 115.6 115.6 37 37 3000. 97.0 69.0 .0100 .020 .200 .100 .300 3.30 .52 .00180 38 38 3600. 94.0 74.0 .0100 .020 .200 .100 .300 3.60 .54 .00180 I 1-Hour 1.61" 2.28" 2.6" 3.68.... 39 39 990. 81.0 58.0 .0100 .020 .200 .100 .300 3.20 .52 .00180 Rainfall Depth 40 40 1200. 61.0 40.0 .0100 .020 .200 .100 .300 4.50 .60 .00180 41 41 2800. 43.0 40.0 .0100 .020 .200 .100 .300 4.35 .59 .00180 I of 42 42 6800. 123.0 65.0 .0100 .020 .200 .100 .300 3.75 .55 .00180 . 100-year rainfall distribution was used for the modeling 43 43 1500. 51.0 40.0 .0100 .020 .200 .100 .300 3.68 .55 .00180 500-year flows. 44 44 3600. 33.0 41.0 .0100 .020 .200 .100 .300 3.38 .53 .00180 .. 1-hour rainfall depth for 500-year storm was obtained by TOTAL HUMBER Of SU8CATCHHENTS, 29 I rOTAl TRIBUTARY AREA (ACRES), 2398.00 extrapolation of the 10-, 50-, and 100-year 1-hour rainfall depths with LOG-LOG paper. I I I I