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<br /> (j <br /> ~, <br /> -...! <br /> (. <br /> -, <br /> \...' <br /> r- <br /> ;'_.1 <br /> 1 <br /> I c <br /> , <br /> , G <br /> ; <br /> I c <br /> I <br /> I <br /> 0 <br /> I <br /> I <br /> I' 0 <br /> (", <br /> I ,-,' <br /> G <br /> , \ <br /> L- <br /> a <br /> (-, , <br /> <, <br /> 0' <br /> c <br />.- r', <br /> '..' <br /> ( ; <br /> <br />S tUh'ater Res. <br /> <br />Bear River - <br />tributary to Yaepa R. <br />Little Cottoowood Cr. - <br />tributary to Fortification <br />Creek 1.6 <br />Willow Creek <br />tributary to Elk R. ~ <br />E1khead Creek -. <br />tributary to <br />Yaelpa R. 212 <br />Fortification Creek- <br />tribut'11cy to <br />Y.,!:1?a R. 220 <br /> <br />605 <br /> <br />6200 <br /> <br />Freeuian Res. <br /> <br />115 <br /> <br />Hahns Peak Res. <br /> <br />600 <br /> <br />E ll:head Lake <br /> <br />13700 <br /> <br />Ralph 1.11ite Res. <br /> <br />3. ,<O:l}Qat".J.c>_&l. - The clinate of the area is guwrally sE:d-add. <br />The hie-h mOl!ntains are conparativcly 'io.-'et a:r;d cool ...."nert23S the lo\-"cr areas <br />are dryer and W2rr:cer. The Pacific OCC2:.1 2nd the Gulf of t~.::xico are <br />the prioary Loisture sources. Air-~l2s.ses fraITl these SCll-rc~:s lose ...,uc:h <br />or their r.:oisture as they cross high !,",01..Elt<~iil r'1.nr,es pr.-for to I...:~}t~~ri.ng <br />the Yailipa River basin. Generally, air--r;onsses frOi;] the. P;1cific: Oc,~an <br />dOininate from October through April ~hile during the latl~ sprillg 2~d <br />SUi.JL'ler air-masses froC] the Gulf of l<exico are clc'-;1_in.::-:.t. <br /> <br />A nOG..-;al .:ii:fil;;11 prEcipi~ation m~1p and a listing of c1:L::ate st;;;~:tGns <br />in the. iirea are shown on chart 3. AV2r"'r;e 2nnu~-11 p;:ec::ipi.tat:.on -at Craig <br />is about 13.8 inches. Durillg the wirltcr ~ost of the prc(:lpit:atioIl fal_Is <br />2.5 snow. ThundcrstoLi"iS ,--:re COL'-.."C:Oll duri-ng tZle SU1;lj;;e_r. The j~;,--:Ixirr;'....:m <br />hourly rainfall at Craig ~2S 2.04 iIICllCS and ~2S recorded on 7 AULust <br />1970. <br /> <br />4. Streamflow records - Records of streamflow are available at 65 <br />lOC<:lt-i~,s-~~~i-t-hin-t-l~-~-ial;1pa River basin. These Iocat.ions are listed on <br />Table 1. <br /> <br />5. Flo_o<!,~~s...t,o_r.1. Flood flo'-'5 on the Y";:;pa River cad its tributaries <br />are c<lused prima.r-ily by ::;no\-,"JJclt dur.i.ng the E;lrch th~oUEh June pcr.i.od. <br />On c;.cc~.5-ion th2se floods have bct.:'n <lllt:,)Cnted by ra~~.n a~d rc:::;ult J.n <br />sulJst:lrltial1y his,he:r pe2k fJor.....'s th,ln \..--ol~ld be ('~xp~~ctcd frD:il sric"...;;I,<.::lt <br />alone.' Snow~21t floods are cilaractcri~ed by ~oderate pp~ks, l~[ge <br />yolu:J('s, 2nd long durations. Tll1;.ndl~l:stor!:~s occur in t!.'IC. su;,':~r'r n:l:1 [;111 <br />a:1d can produce hi,l3h r:c;Jk fJof...;S fro;n ~'.i;~,"111 <i'fC'1S. T'hl~~c~2. ~>tO[j:'S do not <br />produce hiljh f.lc.....s on the lareer strC',~ii}S Ll~C;,'1I-'3e of t}H: 1:1'i1i;-'('d .011",>3:1 <br />covcraee. Thundcr'stor-.--:-:s are charact(,l"j~~(~d by hfGh p,,~ay...sJ Io\-:.- v~)lu;L;f's, <br />311d sllort dllrations. <br /> <br />The larGest floods of l-ec()l-d on LLe Yar;::1)3 l-<'.iver nrc ] Isted in I~he <br />follo^"J.;-:g table. <br /> <br />2 <br /> <br />i '.~ <br />