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100 O= 1.19'(A)^0.846'(P)^1.074 = 522 cfs <br />200 O= 1.67'(A)"0.828'(P)^1.036 - 615 cfs <br />500 ~= 2.48' A^0.808' P)^0.995 = 755 cfs <br />"1'able 1- US(;~ Regression 1:yuations I~7ows <br />~w <br />~ <br />,..'~` , '- ~ • - <br />~ • <br />. r ~• { <br />- , ~ . ,~ ~ , <br />;y . ~ -`^ .~'~,,,,~ ~, ~ <br />wJ'' ~ .}, - ~ • . ~ <br />a~' .~ . _~ . <br />~~~~~ <br />. <br />• ~ - ~~~~•~--r-- <br />~ ~`~ w , <br />~ . . ' .., ~~~J~~ ~ ~,,,y7~ -~ .~. (,- <br />~ r ~ ~ ' ~+s .. ~."3 <br />~ ~ ~.~ <br />I <br />/~ ~ A <br />/ ~, " ~• ,, ~ `, . <br />~ <br />~ ' ~~ <br />~ , ~; ~' <br />~ ~~"~ ~\ y - ' ~ .. <br />. r ~ ,~'~- <br />: ~. ~ . . <br />, ~ ~ ~ ~: ~ , .~r . <br />~~ ' ~ ~ -~ <br />Fi~ure 3 - Draina};e Basin <br />Hydraulics <br />The hydraulics were performcd using the Arniy Corps of Engineers hydraulics program <br />HEC-RnS. The pr~gram estahlished the limits of the 1(x)-year flcxxiplain using thc l(x)- <br />year flow rate calculated from the USGS regressiun eyuations. <br />Based on visual characteristics and the topographic mapping available, this area is an <br />alluvial fan. Alluvial fans typically include multiple drainagr channels and somewhat <br />unpredictahle tlow pattern~. Two channels exist currently in the floodplain; one is deeper <br />and morc ~r~~minent, and the other appears to be an overflow rhannel. Due to the <br />unpredirtable nature of alluvial fan floodplains, the flaw can potentially become blocked <br />in the main channel from banks callapsing or the overtlow channel bottom can be erc~ded <br />lowcr than thr main channel resulting in the entire tlood ilc~w tc~ br re-rc~ute~i down thc <br />San Luis, Calorado - Rito Scco Approximatc Floodplain <br />