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<br /> <br />",<1, <br />. <br />~.'>\'\9, <br />,'" \. <br />/,; ~ " <br />~\." <br /> <br />the Summer months. There is M..r.ecpP,d of stream gaging stations in the <br />watershed. Flood peaks were estinia~ed from preeipitation recorded at <br />Trinidad. Runoff was det,erm:i.ned. frpm a eorrelation of rainfall-runoff <br />relationship curvesJ irti~ltration rates, and initial loss depending on <br />antecedent eonditions. . The estimated runoff for eaeh storm .,as applied <br />to a synthetic unit hydrograph developed for the drainage area above <br />the dam site. The 14 JuJ.;y: 19h8: flo9d peak was estimated b-.f the s10pe- <br />area method from data furn:i.shed by the city of 1:rinidad. The 13 July <br />1945 flood and the 25 July 1950 flo~d were eorre1ated on a magnitude <br />basis to the 1948 flood from information obtained from local testimony. <br />, . <br />Flood peaks were estimated at the W:j.11ow street erossing (a point <br />selected to determine damages and b$,nefits) by. inereasing the esti- <br />mated peak discharge at the dam sHe by the ratio of the square roots of <br />the respective drainage are?s. The;estimate~f~oodpeak~scharges for <br />Pinon.Oanon Arroyo are shown in table 1 for the period '1914 through 1950. <br />. " ,',., ' . <br /> <br />Date of peak <br /> <br />14 July <br />25 July <br />22 July <br />6 AuguSt. ' <br />13 July <br />28 september <br />24 July <br />11 August : <br />i3 July <br />5 September <br />10 September, <br />27 June <br />21 August <br />8 October <br /> <br />T4BLE 1 <br /> <br />ESTIMATED Ji>EAK DISCHARGES <br />. PINON CANONIAllROYO - ;J.9J,4-50 ;. <br /> <br />! Peak. di.scharge <br />at. <br />. : . dam site (1) <br />. (c.fos..) <br /> <br />Peak discharge <br />at <br />: WillqwSt. (2) <br />(e.f.s.) <br /> <br />2000 <br />1570 <br />...1350. <br />1350 <br />1350 <br />1230 <br />. .1000 <br />820 <br />730 <br />700 <br />670 <br />670 <br />660 <br />Q)5?0 <br /> <br />19LJ8 <br />1950 <br />1925 <br />1929 <br />1945 <br />1936 <br />1928 <br />1923 <br />1941 <br />194LJ <br />1918 <br />1937. <br />1923 <br />1938 <br /> <br />, ], <br /> <br />1780 <br />1400 <br />1200 <br />12bo. <br />1200 <br />1100. <br />900 <br />730 <br />650 <br />620 <br />600 <br />600 <br />590 <br />510 <br /> <br />. - ',' <br />(1) Drainage' area 1.14-sqljBl:'s miles... <br />(2)Drainage area 1..42sq\lart3 ITJiles, <br />></ (3)'.lVJi~~b~~~56;~~~:~:ty below ihe dam site <br /> <br />2-04~' Sediment data. - The watiershed above Pinon Canon Dam site <br />has a dra:i:nage area of a.bout 1.14 square miles and varies. from eleva- <br />tion 6150 at the dam site to .about elevation 6800 at .the west end of <br /> <br />:-2- <br /> <br />Appendix I <br />