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<br /> <br />Table 6,4, Simulated annual salt load from natural channels in the Coal Creek study area, <br /> <br />Year <br /> <br />Salt Source <br /> <br />1 <br /> <br />2 <br /> <br />3 <br /> <br />N <br />~ <br />o <br />N <br /> <br />Overland <br /> <br />777 <br />Y!~!~_is~~l________~!~!Z_~_!Q_________!~~~~~_~_!Q_____----~Q~~~-~-!Q- <br />Percent 77 83 76 <br /> <br />1st Order Channels <br /> <br />77' <br />!!~!~_iB:!!~2.~________Z:.~~_~_!Q__________!~.:.~!_~_!Q--__-----!~.:.!~-~-!Q~ <br />Percent 12 9 12 <br /> <br />2nd Order Channels <br /> <br />777 <br />~!~~~_1~~~1_________~.:.~Q_~_!Q___________~.:.QQ_~_!Q_____-----~.:.~~-~-!Q- <br />Percent 6 4 6 <br /> <br />3rd Order Channels <br /> <br />777 <br />'~~!~_,(S!1'~L_______~~~~_~_l2___________~~~:L~_l2_______, .__U~_~_l2_ <br />Percent 4 3 4 <br /> <br />4th Order Channels <br /> <br />777 <br />~~~!~_i~!1'~L_________2~Z~_~_l2___________l~~~_~_l2__________~~2~_~_l2_ <br />Percent 1 1 2 <br /> <br />Total <br /> <br />Yield (gms) <br /> <br />66.19 x 107 <br /> <br />191.34 x 107 <br /> <br />105,93 x 107 <br /> <br />Average <br /> <br />79 <br /> <br />11 <br /> <br />5 <br /> <br />4 <br /> <br />Model sensitivity <br /> <br />A sensitivity analysis of the model <br />was conducted. Table 6.5 lists the important <br />model parameters in order of decreasing <br />effect on results. The value used for each <br />parameter/in the simulation runs is also <br />given. (\s can be seen, the model is most <br />sensitiv'e to parsmeters wbich significsntly <br />affect the predicted runoff. <br /> <br />Estimated salt output as Woodside <br /> <br />If Coal Creek is representative of the <br />natural channels in -the Price River Basin, <br />these results may be extrapolated to estimate <br />salt loading values at Woodside. Far this <br />extrapolation, the area of exposed undivided <br />Mancos Shale within the Coal Creek study <br />section was estimated from solIs maps to be <br />21.46 square miles. Fonce (1975) estimated <br /> <br />Table 6.5, Coefficient values for application of the hydro salinity model of the Coal Creek <br />drainage, <br /> <br />Parameter(s)1 <br /> <br />Description <br /> <br />FC <br />A,B,C <br />SI <br />SS <br />DKT <br />AREA <br />CHANI. <br />XCHCO <br />WP <br />TELIM <br />XKC2 <br />FrCAP <br />Fa <br />XKCl <br />SMOIS <br />TAVSW <br />IFRS <br />IFRF <br /> <br />Minimum infiltration capacity rate (inches/hr) <br />Shape factors of characteristic hyetograph <br />Upper limit of interception depression storage (inches) <br />Saturated soil level (inches) <br />Decay constant in infiltration equation (hr-hr) <br />Microchannel drainage area (acres) <br />Microchannel length (feet) <br />Factor to adjust salt pickup for length of channel <br />Wilting point of soil (inches) <br />Upper limit on precipitation intensity allowed (inches/hr) <br />Consumptive use coefficient of native vegetation <br />Field capacity of soil (inches) <br />Initial infiltration capacity rate (inches/hr) <br />Consumptive use coefficient of native vegetation <br />Initial soil moisture level (inches) <br />Decay constant in surface water routing (hr-hr) <br />Beginning of frost free season (Julian day) <br />End of frost free season (Julian day) <br /> <br />lLiated in order of decreasing model sensitivity. <br /> <br />60 <br /> <br />Value Used <br /> <br />Depends on shale <br />-3.2, 4.8, -0.6 <br />0,05 <br />3.0 <br />20,0 <br />0.51 <br />120.0 <br />0.4 <br />0.5 <br />1.5 <br />0.89 <br />2.0 <br />Depends on shale <br />0,58 <br />1.0 <br />5,0 <br />135 <br />275 <br />