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<br /> TABLE 2 <br /> PIONEER DITCH <br /> FUTURE CONDmONS <br /> IO-YEAR, 6-HOUR HYDROGRAPHS <br /> CUMULATIVE CUMULATIVE <br /> INFLOW VOLUME-INFLOW CALCULATED VOLUME- <br /> HYDRO GRAPH HYDROGRAPH CHANNEL CHANNEL <br />TIME (Leaf, 1988) (Leaf, 1988) HYDRO GRAPH HYDROGRAPH <br />(hrs) (cfs) (acre-feet) (cfs) (acre-feet) <br />2.0 0 0 0 0 <br />2.4 10 0.33 10 0.33 <br />2.8 20 0.99 20 0.99 <br />3.2 40 2.31 40 2.31 <br />3.6 80 4.95 80 4.95 <br />4.0 140 9.58 140 9.58 <br />4.4 220 16.85 220 16.85 <br />4.8 300 26.77 300 26.77 <br />5.2 380 39.33 380 39.33 <br />5.6 480 55.20 480 55.20 <br />6.0 600 75.03 600 75.Q3 <br />6.4 720 98.83 720 98.83 <br />6.8 740 123.29 900 128.58 <br />7.2 740 147.75 1040 162.96 <br />7.6 720 171.55 900 192.71 <br />8.0 700 194.69 . 700 215.85 <br />8.4 *620 215.19 620 236.35 <br />11.4 0 ..~. 0 **305.35 <br /> <br />* Represents peak outflow. <br />** Compares to the 301.2 acre-feet of runoff volume at node 4. <br /> <br />3.2.5 Once a hydrograph was established for Pioneer Ditch, the detention pond <br />analysis began. The pond was initially assumed to be rectangular in shape, with 1 vertical on <br />3 horizontal (lV:3H) sides10pes and an overflow weir between it and the channel to pass flows. <br />The initial target overflow was assumed to be 740 cfs, as determined in the Leaf (1988) report. <br /> <br />5 <br />