1 RETURN INTENSITY PERIOD RAINFALL 5 56.95 10 68.83 20 71.36 30 76.57 50 81.70 80 84.02 1 RAINFALL HYETOGRAPH TIME 5-YR 10-YR 20-YR 30-YR 50-YR 80-YR .1 .42 .50 .52 .56 .60 .61 .2 1.46 1.77 1.83 1.97 2.10 2.16 .3 3.71 4.48 4.65 4.98 5.32 5.47 .4 6.55 7.92 8.21 8.81 9.40 9.67 .5 8.16 9.86 10.23 10.97 11.71 12.04 .6 7.38 8.91 9.24 9.92 10.58 10.88 .7 7.60 9.19 9.53 10.22 10.91 11.22 .8 7.14 8.62 8.94 9.59 10.24 10.53 .9 7.66 9.26 9.60 10.30 10.99 11.30 1.0 6.87 8.31 8.61 9.24 9.86 10.14 1 NW-1 1 ( NA ) STRIP NUMBER = 5 ( DT ) UNIT TIME OF UNIT-GRAPH(HOUR) = .10 ( XL ) BASIN-LENGTH(KM) = 2.00 (COFF) RUNOFF COEFFICIENT = .77 (BET ) INITIAL CONCENTRATION TIME = .00 ZONING LENGTH AREA(I) ACCUMU. WIDTH TIME NUMBER (KM) (SQ.KM) AREA(I) (KM) (HR) 1 .15 .030 .030 .200 .005 2 .50 .560 .590 1.118 .021 3 .50 .620 1.210 1.238 .038 4 .50 .240 1.450 .480 .032 5 .35 .080 1.530 .229 .012 1 CONCENTRATED LENGTH AND AREA TIME LENGTH AREA (HOUR) (KM) (SQ.KM) .1 1.77 1.476 .2 2.00 .054 C1 = .632 C2 = .368 1 AREA-ROUTING UNIT-HYDROGRAPH TIME AREA I=2.7780 (I1 + I2)/2 C1 * (1) C2 * (4) (2) + (3) (HR.) (KM**2) * AREA = (1) = (2) = (3) = (4) .1 1.476 4.101 2.051 1.296 .000 1.2962 .2 .054 .149 2.125 1.343 .477 1.8202 .3 .000 .000 .074 .047 .670 .7168 .4 .000 .000 .000 .000 .264 .2637 .5 .000 .000 .000 .000 .097 .0970 .6 .000 .000 .000 .000 .036 .0357 .7 .000 .000 .000 .000 .013 .0131 .8 .000 .000 .000 .000 .005 .0048 .9 .000 .000 .000 .000 .002 .0018 1.0 .000 .000 .000 .000 .001 .0007 1.1 .000 .000 .000 .000 .000 .0002 1.2 .000 .000 .000 .000 .000 .0001 1.3 .000 .000 .000 .000 .000 .0000 1.4 .000 .000 .000 .000 .000 .0000 1.5 .000 .000 .000 .000 .000 .0000 1.6 .000 .000 .000 .000 .000 .0000 1.7 .000 .000 .000 .000 .000 .0000 1.8 .000 .000 .000 .000 .000 .0000 1.9 .000 .000 .000 .000 .000 .0000 2.0 .000 .000 .000 .000 .000 .0000 2.1 .000 .000 .000 .000 .000 .0000 2.2 .000 .000 .000 .000 .000 .0000 2.3 .000 .000 .000 .000 .000 .0000 2.4 .000 .000 .000 .000 .000 .0000 2.5 .000 .000 .000 .000 .000 .0000 2.6 .000 .000 .000 .000 .000 .0000 2.7 .000 .000 .000 .000 .000 .0000 2.8 .000 .000 .000 .000 .000 .0000 2.9 .000 .000 .000 .000 .000 .0000 3.0 .000 .000 .000 .000 .000 .0000 3.1 .000 .000 .000 .000 .000 .0000 3.2 .000 .000 .000 .000 .000 .0000 3.3 .000 .000 .000 .000 .000 .0000 3.4 .000 .000 .000 .000 .000 .0000 3.5 .000 .000 .000 .000 .000 .0000 3.6 .000 .000 .000 .000 .000 .0000 3.7 .000 .000 .000 .000 .000 .0000 3.8 .000 .000 .000 .000 .000 .0000 3.9 .000 .000 .000 .000 .000 .0000 4.0 .000 .000 .000 .000 .000 .0000 4.1 .000 .000 .000 .000 .000 .0000 4.2 .000 .000 .000 .000 .000 .0000 4.3 .000 .000 .000 .000 .000 .0000 4.4 .000 .000 .000 .000 .000 .0000 4.5 .000 .000 .000 .000 .000 .0000 4.6 .000 .000 .000 .000 .000 .0000 4.7 .000 .000 .000 .000 .000 .0000 4.8 .000 .000 .000 .000 .000 .0000 4.9 .000 .000 .000 .000 .000 .0000 5.0 .000 .000 .000 .000 .000 .0000 1 FLOOD HYDROGRAPH BY AREA-ROUTING UNIT-HYDROGRAPH METHOD BASIN AREA = 1.53SQ.KM BASIN LENGTH = 2.00KM TIME 5-YR 10-YR 20-YR 30-YR 50-YR 80-YR .1 .41 .50 .52 .56 .60 .61 .2 2.04 2.47 2.56 2.75 2.93 3.01 .3 5.98 7.23 7.49 8.04 8.58 8.82 .4 12.63 15.27 15.83 16.98 18.12 18.63 .5 19.71 23.82 24.69 26.50 28.27 29.07 .6 23.29 28.15 29.18 31.31 33.41 34.36 .7 24.08 29.10 30.17 32.38 34.55 35.53 .8 24.11 29.14 30.21 32.42 34.59 35.57 .9 24.17 29.22 30.29 32.50 34.68 35.66 1.0 17.08 20.64 21.40 22.96 24.50 25.19 1.1 6.56 7.93 8.22 8.82 9.41 9.68 1.2 2.41 2.92 3.02 3.25 3.46 3.56 1.3 .89 1.07 1.11 1.19 1.27 1.31 1.4 .33 .39 .41 .44 .47 .48 1.5 .12 .15 .15 .16 .17 .18 1.6 .04 .05 .06 .06 .06 .07 1.7 .02 .02 .02 .02 .02 .02 1.8 .01 .01 .01 .01 .01 .01 1.9 .00 .00 .00 .00 .00 .00 2.0 .00 .00 .00 .00 .00 .00 2.1 .00 .00 .00 .00 .00 .00 2.2 .00 .00 .00 .00 .00 .00 2.3 .00 .00 .00 .00 .00 .00 2.4 .00 .00 .00 .00 .00 .00 2.5 .00 .00 .00 .00 .00 .00 2.6 .00 .00 .00 .00 .00 .00 2.7 .00 .00 .00 .00 .00 .00 2.8 .00 .00 .00 .00 .00 .00 2.9 .00 .00 .00 .00 .00 .00 3.0 .00 .00 .00 .00 .00 .00 3.1 .00 .00 .00 .00 .00 .00 3.2 .00 .00 .00 .00 .00 .00 3.3 .00 .00 .00 .00 .00 .00 3.4 .00 .00 .00 .00 .00 .00 3.5 .00 .00 .00 .00 .00 .00 3.6 .00 .00 .00 .00 .00 .00 3.7 .00 .00 .00 .00 .00 .00 3.8 .00 .00 .00 .00 .00 .00 3.9 .00 .00 .00 .00 .00 .00 4.0 .00 .00 .00 .00 .00 .00 4.1 .00 .00 .00 .00 .00 .00 4.2 .00 .00 .00 .00 .00 .00 4.3 .00 .00 .00 .00 .00 .00 4.4 .00 .00 .00 .00 .00 .00 4.5 .00 .00 .00 .00 .00 .00 4.6 .00 .00 .00 .00 .00 .00 4.7 .00 .00 .00 .00 .00 .00 4.8 .00 .00 .00 .00 .00 .00 4.9 .00 .00 .00 .00 .00 .00 5.0 .00 .00 .00 .00 .00 .00 1 RETURN INTENSITY PERIOD RAINFALL 5 56.95 10 68.83 20 71.36 30 76.57 50 81.70 80 84.02 1 RAINFALL HYETOGRAPH TIME 5-YR 10-YR 20-YR 30-YR 50-YR 80-YR .1 .42 .50 .52 .56 .60 .61 .2 1.46 1.77 1.83 1.97 2.10 2.16 .3 3.71 4.48 4.65 4.98 5.32 5.47 .4 6.55 7.92 8.21 8.81 9.40 9.67 .5 8.16 9.86 10.23 10.97 11.71 12.04 .6 7.38 8.91 9.24 9.92 10.58 10.88 .7 7.60 9.19 9.53 10.22 10.91 11.22 .8 7.14 8.62 8.94 9.59 10.24 10.53 .9 7.66 9.26 9.60 10.30 10.99 11.30 1.0 6.87 8.31 8.61 9.24 9.86 10.14 1 NW-2 1 ( NA ) STRIP NUMBER = 8 ( DT ) UNIT TIME OF UNIT-GRAPH(HOUR) = .10 ( XL ) BASIN-LENGTH(KM) = 3.60 (COFF) RUNOFF COEFFICIENT = .76 (BET ) INITIAL CONCENTRATION TIME = .00 ZONING LENGTH AREA(I) ACCUMU. WIDTH TIME NUMBER (KM) (SQ.KM) AREA(I) (KM) (HR) 1 .10 .030 .030 .300 .003 2 .50 .750 .780 1.497 .021 3 .50 .780 1.560 1.557 .038 4 .50 .360 1.920 .720 .032 5 .50 .220 2.140 .440 .073 6 .50 .250 2.390 .500 .073 7 .50 .230 2.620 .460 .090 8 .50 .110 2.730 .220 .090 1 CONCENTRATED LENGTH AND AREA TIME LENGTH AREA (HOUR) (KM) (SQ.KM) .1 1.65 1.940 .2 2.34 .317 .3 2.94 .290 .4 3.50 .160 .5 3.60 .022 C1 = .214 C2 = .786 1 AREA-ROUTING UNIT-HYDROGRAPH TIME AREA I=2.7780 (I1 + I2)/2 C1 * (1) C2 * (4) (2) + (3) (HR.) (KM**2) * AREA = (1) = (2) = (3) = (4) .1 1.940 5.390 2.695 .575 .000 .5754 .2 .317 .881 3.135 .669 .453 1.1220 .3 .290 .805 .843 .180 .882 1.0625 .4 .160 .445 .625 .134 .836 .9692 .5 .022 .062 .254 .054 .762 .8164 .6 .000 .000 .031 .007 .642 .6488 .7 .000 .000 .000 .000 .510 .5102 .8 .000 .000 .000 .000 .401 .4013 .9 .000 .000 .000 .000 .316 .3156 1.0 .000 .000 .000 .000 .248 .2482 1.1 .000 .000 .000 .000 .195 .1952 1.2 .000 .000 .000 .000 .154 .1535 1.3 .000 .000 .000 .000 .121 .1207 1.4 .000 .000 .000 .000 .095 .0950 1.5 .000 .000 .000 .000 .075 .0747 1.6 .000 .000 .000 .000 .059 .0587 1.7 .000 .000 .000 .000 .046 .0462 1.8 .000 .000 .000 .000 .036 .0363 1.9 .000 .000 .000 .000 .029 .0286 2.0 .000 .000 .000 .000 .022 .0225 2.1 .000 .000 .000 .000 .018 .0177 2.2 .000 .000 .000 .000 .014 .0139 2.3 .000 .000 .000 .000 .011 .0109 2.4 .000 .000 .000 .000 .009 .0086 2.5 .000 .000 .000 .000 .007 .0068 2.6 .000 .000 .000 .000 .005 .0053 2.7 .000 .000 .000 .000 .004 .0042 2.8 .000 .000 .000 .000 .003 .0033 2.9 .000 .000 .000 .000 .003 .0026 3.0 .000 .000 .000 .000 .002 .0020 3.1 .000 .000 .000 .000 .002 .0016 3.2 .000 .000 .000 .000 .001 .0013 3.3 .000 .000 .000 .000 .001 .0010 3.4 .000 .000 .000 .000 .001 .0008 3.5 .000 .000 .000 .000 .001 .0006 3.6 .000 .000 .000 .000 .000 .0005 3.7 .000 .000 .000 .000 .000 .0004 3.8 .000 .000 .000 .000 .000 .0003 3.9 .000 .000 .000 .000 .000 .0002 4.0 .000 .000 .000 .000 .000 .0002 4.1 .000 .000 .000 .000 .000 .0001 4.2 .000 .000 .000 .000 .000 .0001 4.3 .000 .000 .000 .000 .000 .0001 4.4 .000 .000 .000 .000 .000 .0001 4.5 .000 .000 .000 .000 .000 .0001 4.6 .000 .000 .000 .000 .000 .0000 4.7 .000 .000 .000 .000 .000 .0000 4.8 .000 .000 .000 .000 .000 .0000 4.9 .000 .000 .000 .000 .000 .0000 5.0 .000 .000 .000 .000 .000 .0000 1 FLOOD HYDROGRAPH BY AREA-ROUTING UNIT-HYDROGRAPH METHOD BASIN AREA = 2.73SQ.KM BASIN LENGTH = 3.60KM TIME 5-YR 10-YR 20-YR 30-YR 50-YR 80-YR .1 .18 .22 .23 .24 .26 .27 .2 .99 1.20 1.25 1.34 1.43 1.47 .3 3.21 3.87 4.02 4.31 4.60 4.73 .4 7.52 9.08 9.42 10.11 10.78 11.09 .5 13.49 16.30 16.90 18.14 19.35 19.90 .6 19.32 23.35 24.21 25.98 27.72 28.51 .7 24.22 29.27 30.34 32.56 34.74 35.73 .8 28.16 34.03 35.29 37.86 40.40 41.55 .9 31.29 37.81 39.20 42.06 44.88 46.16 1.0 30.60 36.98 38.34 41.14 43.89 45.14 1.1 26.19 31.65 32.81 35.21 37.57 38.63 1.2 21.70 26.23 27.20 29.18 31.14 32.02 1.3 17.42 21.06 21.83 23.42 24.99 25.70 1.4 13.74 16.61 17.22 18.47 19.71 20.27 1.5 10.81 13.06 13.54 14.53 15.50 15.94 1.6 8.50 10.27 10.65 11.43 12.19 12.54 1.7 6.68 8.08 8.38 8.99 9.59 9.86 1.8 5.26 6.35 6.59 7.07 7.54 7.76 1.9 4.13 5.00 5.18 5.56 5.93 6.10 2.0 3.25 3.93 4.07 4.37 4.66 4.80 2.1 2.56 3.09 3.20 3.44 3.67 3.77 2.2 2.01 2.43 2.52 2.70 2.89 2.97 2.3 1.58 1.91 1.98 2.13 2.27 2.33 2.4 1.24 1.50 1.56 1.67 1.78 1.84 2.5 .98 1.18 1.23 1.32 1.40 1.44 2.6 .77 .93 .96 1.03 1.10 1.14 2.7 .61 .73 .76 .81 .87 .89 2.8 .48 .58 .60 .64 .68 .70 2.9 .37 .45 .47 .50 .54 .55 3.0 .29 .36 .37 .40 .42 .43 3.1 .23 .28 .29 .31 .33 .34 3.2 .18 .22 .23 .24 .26 .27 3.3 .14 .17 .18 .19 .21 .21 3.4 .11 .14 .14 .15 .16 .17 3.5 .09 .11 .11 .12 .13 .13 3.6 .07 .08 .09 .09 .10 .10 3.7 .05 .07 .07 .07 .08 .08 3.8 .04 .05 .05 .06 .06 .06 3.9 .03 .04 .04 .05 .05 .05 4.0 .03 .03 .03 .04 .04 .04 4.1 .02 .03 .03 .03 .03 .03 4.2 .02 .02 .02 .02 .02 .02 4.3 .01 .02 .02 .02 .02 .02 4.4 .01 .01 .01 .01 .01 .02 4.5 .01 .01 .01 .01 .01 .01 4.6 .01 .01 .01 .01 .01 .01 4.7 .00 .01 .01 .01 .01 .01 4.8 .00 .00 .00 .01 .01 .01 4.9 .00 .00 .00 .00 .00 .00 5.0 .00 .00 .00 .00 .00 .00