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<br /> -.-. -','--" ,~..._ ,_.r_'.._,__.-__-..........., _. <br /> T ( 11.9 L3 ) .385 ~J <br /> ~ H <br /> ~ <br /> T Tc in hours Ii <br /> ~ 61 <br /> L ~ Length of longest watercourse in mil es <br /> H ~ Elevation difference in feet ~I <br /> 10 <br /> . I <br /> 4~,000 10.0 0- Ji <br /> 8.0 <br /> 30.000 6.0 Ii <br /> Vl 20 <br /> ... <br /> 4.0 " I.. <br /> 0 <br /> 20,000 3.0 :r. II <br /> '" 30 <br /> .~ <br /> 2.0 . 40 tt) <br /> u <br /> 10.000 >- ~ I <br /> <lJ ~ <br /> 1.0 E b' <br /> 8,000 .~ 60 ..... <br /> .8 >- <lJ <br /> --- .6 <lJ ~ <br /> --- --. s:: ~" 80 . -u..----~-------- - <br /> 6,000 '-, 0 <br /> ._, .~ co <br />- .4 ~----- 100 .~ <br /> --. <br /> ... - - ---- <lJ <br />..... .3 ..... --- --. u II <br /><lJ 4,000 co co <br />CJ <lJ <lJ <br />u.. U ... <br /> 3,()fJO .2 <= <l) <br />;: 0 ..... J <br />.~ w 2fJO ..... <br /> .~ II <br />.<: c <br />..... <br />c-, 2,000 .1 . <br />s:: co l. <br /><l) 300 0 <br />-.J .~ {I <br /> ..... <br />~ '" <br /><lJ .05 400 > <br />co <l) <br />co ~ <br />'" w <br />.s;: 1,000 'I <br />w 600 <br /> 800 <br /> I <br /> 800 .' <br /> 600 <br /> 500 lfJOO I <br /> .01 ~__c::~ <br /> 400 "j <br /> -~ <br /> 300 ~- <br /> 2fJOO <br /> Exampl e: ----_ L <br /> 200 L : 7250 ft. -~---=-=.c, ~ <br /> H : 130 ft. 3'100 <br /> T = 0.57 hrs. <br /> c 4000 I <br /> 100 5000 I <br /> <br />22 <br /> <br /> <br />FiCjure 111-6 Estimatinq Tc from Lenqths and Slopes of Ilatural Channels <br />