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<br />:==JOJJ751 <br />~. <br /> <br />=6- <br /> <br />q <br />= <br /> <br />The three steps are briefly summarized as follows I <br /> <br />1. A preliminary analysis of monthly and seasonal precipitation <br />data for some Colorado stations having periods of record from 40 to <br />70 years, these data to be ana4rzed by hand computations. <br /> <br />2. The placing of all past records prior to 1948 on punch cards <br />in anticipation that these punched cards could be much more easily <br />analyzed through machine processes. <br /> <br />3. The actua1 alllllysis of the punched card data to produce <br />results showing preoipitation probabilities by individual stations <br />and in combinations of stations. <br /> <br />STEP NO.1 <br /> <br />Past precipitation data are aw.Uable for the following <br />20 stations for a period extending from 39 to 71 years. Eighteen <br />of these stations are located within the upper area of the Colorado <br />River catchment basin. Two stations, Saguache and Leadville, are <br />in nearby surrounding areas adjacent to the head waters of the <br />Colorado River. <br /> <br />Delta 71 Dillon 52 <br />Montrose 71 SUirerton 52 <br />Grand Junction 69 Fraser 50 <br />Gunnison 68 Telluride 50 <br />Durango 67 Cortez; 46 <br />Collbran 67 Rifle 46 <br />Paonia 61 Pagos&. S'prings 39 <br />Crested Butte 60 Saguache 63 <br />Glenwood Springs 59 Leadville 63 <br />Steamboat Springs 56 Rio Grande Basin 63 <br />Meeker 55 .Arkansas Basin 63 <br /> <br />Data for these stations would be analyzed to show the <br />frequenoy arre,y both by months and for the water year (October 1 <br />through September 30) for their entire period of record. This <br />should show the months of the year which are most erratic and have <br />the highest variabillt:r in precipitation amounts. <br /> <br />It would be :l.'urther possible to develop some preliminary <br />indicators of the lag flow and lag absorption relationships which <br />. follow respectively after e:rlremely heavy precipitation periods or <br />extremely light precipitation periods. <br />