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i <br />TABLE 2.7-12b. <br />BASIN <br />CHARACTERISTICS <br />FOR THE PYEATT AND <br />FLUME GULCH <br />DRAINAGES. <br />---------------------------------------------------------------------------' <br />BIFURCATION <br />ESTIMATE[ <br />AREA <br />BASIN <br />CHANNEL DRAINAGE <br />RATIO <br />ANNUAL <br />----------- <br />SLOPE <br />SLOPE DENSITY <br />------------ <br />YIELD <br />BASIN MILES <br />--------------------------------------------------------------------------- <br />ACRES <br />(ft/ft) <br />(ft/ft)(mi/sq mi) <br />1st/2nd <br />2nd/3rd <br />(acre/ft) <br />WEST <br />PYEATT .438 <br />280 <br />.11 <br />.088 8.42 <br />5.0 <br />3.0 <br />22 <br />MIDDLE <br />PYEATT .653 <br />418 <br />.173 <br />.098 8.33 <br />6.67 <br />3.0 <br />33 <br />EAST <br />PYEATT =2.10 <br />1346 <br />.167 <br />.097 8.37 <br />4.0 <br />4.67 <br />105 <br />FLUME <br />WFORK � 659 <br />422 <br />.147 <br />.10 10.08 <br />3.71 <br />3.5 <br />33 <br />FLUME <br />MIDDLE' <br />FORK 648 <br />415 <br />.188 <br />.11 9.52 <br />2.89 <br />3.0 <br />32 <br />FLUME J <br />MIDDLE � <br />FORK T.281 <br />180 <br />.242 <br />.14 13.23 <br />4.0 <br />2.0 <br />14 <br />FLUME <br />MIDDLE <br />E. FORK .911 <br />583 <br />.172 <br />.10 11.47 <br />3.0 <br />4.5 <br />46 <br />• <br />FLUME <br />_ <br />E. FORK .241 <br />154 <br />.168 <br />.11 13.34 <br />4.75 <br />4.0 <br />12 <br />MEAN <br />10.3 <br />NOTE: 10 yr/24 hr <br />rainfall depth = 1.7 inches <br />100 yr/24 hr <br />rainfall <br />depth = 2.5 inches <br />Annual <br />yield <br />calculated from area in and <br />upstream <br />of the <br />mine <br />permit <br />area <br />2-4148 <br />D FEB 13 '87 <br />