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• Erhihn IS- Portd Oroina_Qe Design <br />encompass the Cow Canyon watershed. As a consequence of this greater potential to be affected by <br />a localized intense storm, Cow Canyon major crossings are run at slightly more conservative flow <br />estimates. <br />TABLE 4 <br />LORENCITO CANYON MINE SEDCAD+ RUNS <br />Major Crossings with Modified CNs <br /> LAR LHR COW CANYON <br /> 3248 3523 36891 <br /> 4299 4197 26038 <br /> 5631 5096 30206 <br /> 6043 13477 <br /> 7227 13948 <br /> 7685 14857 <br /> 13220 15174 <br /> 13769 <br /> 14531 <br /> 14956 <br />Peak discharge values for the side canyons of Lorencito were similarly overestimated and thus curve <br />• numbers have been modified in these SEDCAD+runs (Table 5) [o provide better estimates. Again, <br />because the peak discharge in the side canyons is more likely to be affected by localized intense <br />storms, curve numbers were not reduced to the extent of [he larger watersheds. Instead, shrub <br />communities are run at 62 and grass communities are run at 74; the hydrograph response Lime has <br />also been changed to 'Slow'. <br />TABLE 5 <br />LORENCITO CANYON MINE SEDCAD+ RUNS <br />Lorencito Side Canyons with Modified CNs <br /> LAR LHR <br /> 1218 1605 (Jeff Canyon) <br /> 2299 2588 <br /> 8]02 8286 (Puertecito Canyon) <br /> 9489 9844 <br /> l 1965 12274 (Little Pine Can}!on) <br />SEDCAD+ requires the specification of a flow condition. This is based on the vegetative <br />community and whether water is flowing overland or in a channel. The Land Use Condition (LUC) <br />values are consistently applied as presented in Table 6. <br /> <br />(revised 4/20/01) <br />