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<br />I <br />I The entire basin was divided into 12 sub-basins so that a's could be <br />determined at a number of locations. These sub-bas ins are i dent ifi ed on <br />I the Basin Boundary Map found in the Appendix of this report (sheet 1 of 12 <br />of the drawings). The physical characteristics and hydrograph parameters <br /> for each of these subareas as well as the entire basin are tabulated in <br />I Table 2. <br />I TABLE 2 <br />I WATERSHED AND HYDROGRAPH PARAMETERS <br />I <br />I Length to Basin <br /> Sub- Area Length Centroid Slope % Ct Cp Ct <br />I Basin (Sq. Mi.) (Mi. ) (Mi. ) (So)% Imp. (Computer) (Fig. 1) <br />I 100 4.251 5.926 2.655 1. 985 37.56 .395 .603 .094 <br />200 4.110 5.784 2.566 2.020 35.93 .394 .574 .095 <br />I 300 3.476 5.093 2.254 2.090 36.70 .373 .575 .095 <br />1000 0.261 0.455 0.322 2.500 38.69 .161 .412 .094 <br /> 300 & <br />I 1000 3.737 5.093 2.178 2.090 36.84 .371 .584 .095 <br /> 400 3.173 4.601 2.178 2.099 37.60 .360 .578 .094 <br />I 500 2.554 3.749 1. 913 2.252 32.31 .347 .488 .098 <br /> 600 0.308 1. 042 0.549 3.450 39.13 .191 .429 .094 <br />I 610 1.425 2.575 1. 344 2.648 15.64 .350 .311 .117 <br />600 & <br /> 610 1.553 2.575 1. 288 2.648 20.30 .326 .344 .110 <br />I 700 0.707 1. 742 0.975 3.255 11. 21 .310 .275 .124 <br /> 710 0.306 1. 099 0.597 4.110 20.01 .219 .267 .110 <br />I 700 & .294 .119 <br /> 710 1. 013 1. 742 0.937 3.255 13.88 .296 <br />I 800 0.277 0.843 0.417 4.830 20.01 .189 .264 .110 <br /> 900 0.586 1.089 0.492 3.830 9.62 .248 .266 .127 <br />I <br />I <br /> <br />The CUHP computer program was used to fi nd the peak 0 (IOO-year, future <br />development) at the downstream end of each of the 12 subareas. The 0 at a <br />point was computed by lumping in succesion all the contributing areas into <br />s i ngu 1 ar subareas. The 0100 values ca 1 cul ated for the do"ns tream end of <br />each of the 12 subareas are summarized in Table 2A alonq with 0100 values <br />for three key confluences of the various reaches of Marcy Gulch con- <br />sidered in this analysis. Typical hydrographs computed at various subareas <br />are shown in Figures 5, 6 and 7 in the Appendix of this report. <br /> <br />TABLE 2A <br />PEAK FLOW RATES <br />FULLY DEVELOPED CONDITIONS <br /> <br />SUB-BASIN <br />100 <br />200 <br />300 <br />1000 <br />400 <br />500 <br />600 <br />610 <br />700 <br />710 <br />800 <br />900 <br /> <br />CALCULATED <br />0100(1) <br />(cfs) <br />3015 <br />2822 <br />2662 <br />634 <br />2587 <br />1980 <br />560 <br />708 <br />451 <br />316 <br />360 <br />549 <br /> <br />(1) Additional calculated 0100 valves are as follows: <br />Confluence of Sub-Basins 300 & 1000, 0100 = 2934 cfs <br />Confluence of Sub-Basins 600 & 610, 0100 = 1062 cfs <br />Confluence of Sub-Basins 700 & 710, 0100 = 726 cfs <br />