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<br />. <br />, <br /> <br />OOH4:1 <br /> <br />. <br /> <br />-6- <br /> <br />. <br /> <br />2. The placing of all past records prior to 1948 on punch cards in <br />anticipation that these punched cards could be much more easily analyzed <br />through machine processes. <br /> <br />3. The actual analysis of the punched card data to produce results show- <br />ing precipitation probabilities by individual stations and in combinations <br />of stations. <br /> <br />STEP NO.1 <br /> <br />Past precipitation data are available for the following 20 stations for a <br /> <br /> <br />period extending from 39 to 71 years. Eighteen of these stations are located <br /> <br /> <br />within the upper area of the Colorado River catchment basin. Two stations, <br /> <br /> <br />Saguache and Leadville, are in nearby surrounding areas adjacent to the head <br /> <br /> <br />waters of the Colorado River. <br /> <br />Delta 71 Dillon 52 <br />Montross 71 Silver ton 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 pagosa Springs 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 frsquency array both <br /> <br /> <br />by months and for the water year (October 1 through September 30) for their sntire <br /> <br />period of record. This should show the months of the year which are most erratic <br /> <br />and have the highest variability in precipitation amounts. <br /> <br />It would be further possible to develop some preliminary indicators of the <br />lag flow and lag absorption relationships which follow respectively after ex- <br />tremely heavy precipitation periods or extremely light precipitation periods. <br /> <br />f It is expected that all these stations will show a frequency pattern which <br /> <br />describes precipitation occurrences in a semi-arid climatic region. Such patterns <br /> <br /> <br />show a much higher number of cases falling below the arithmetic average than above <br /> <br /> <br />it. This is certainly to he expected during the summer months and probably also <br /> <br />prevails during the winter months in this area. <br /> <br />While a very high percentage of the streamflow of the upper Colorado River <br /> <br />originates in the State of Colorado, a more complete analysis covering an additional <br /> <br /> <br />ten stations scattered throughout the other three Statee of Wyoming, New Mexico and <br /> <br />utah could be accomplished in the same study. <br />