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<br />'" <br /> <br />PRECIPITATION GAGES <br /> <br />The recording and non-recording gages used to recon,;titute histori.cal <br /> <br />v <br />rain flood events and to evaluate the Standard Proj ect Storm and Probable <br />v <br />Naximum Precipitation criteria developed for the Southwestern States 8.1:e <br /> <br />shmm on Table 3. Also shown on this table a:Cl2' ~;ome of the larger <br /> <br />historiall storm depths that have been recorded at the stations shown. <br /> <br />TABLE 3 <br /> <br />PRECIPITATION GAGES <br /> <br />GAGES <br />llECORDING~ <br /> <br />YEARS OF <br />RECORD <br /> <br />HIS TORI ct,l. <br />---,--,.~.__._._. <br />Sept Oct <br />1911 19/11, <br /> <br />STORM DEPTHS <br />.__._~ <br />Oct Sept. <br />1959 1970 <br />-- -~. <br /> <br />Silverton <br />Pleasant View 2W " <br />Durango <br /> <br />70 <br />25 <br />83 <br /> <br />4.25 2.5f" 2.60 4.67 <br />UN!< UNK 1. 19 2.n <br />3.43 L 750 2.16 3./':3 <br /> <br />NO,,-RECOPJ)ING J <br />------ <br /> <br />Dolores' <br />Rico <br />Hancos <br />Cortez, <br /> <br />l,O UN!< mn: 1.B8 2.1,5 <br />75 2.31 3" J.~, .:ro 3.00 <br />51 UN!< unI\. 1.00 1.98 <br />47 UN!< 2.39 1.92 1.66 <br /> <br />The 10J:ations of precipitation gages in and around the study 8.re[, are <br /> <br />shown on Figure 2.. Some of the stations shown Oil Figure 2 were not. USE!d <br /> <br />1.n the 51'S and PHI' evaluation because of incomplete records. <br /> <br />1,,1'1' llYDROGRAPHS <br />.--------.---- <br /> <br />Unit hydrographs were developed using thE, Snyder Unilt Hydrograph, <br />~ CC' I <br />.::>~ , ll,"' C~r <br />S-Curve, and optimization techniques. The Ge!t,,,br:r 1970 storm and <br /> <br />resulting flood hydrograph ,:ere used for optim:l"lng unit hydrograpns and <br /> <br />(',orresponding coefficients at the Rico and Dolon,s gages. 'fhe resulting <br /> <br />4 <br />