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<br />"'OOb71 <br />Task 1.14(b) - Consumptive Use Prototype Development <br /> <br />. In the CU Model, the user has the option to select climate stations for the area and <br />weigh them depending on the location and the method being used. <br /> <br />Elevation <br /> <br />. Elevation is not a factor in the BC ET estimation methods, but will be accounted for <br />by the calibration process. For the PM methods, the elevation at the location of the <br />weather stations will be used to calculate the potential ET. For small areas, the <br />values for potential ET will then be weighted based on the reliability of weather <br />stations and how similar stations are to the site being considered. This weight will <br />be used to apply the potential ET values over the area and get estimations for <br />particular locations. For large areas the weather station in the area will be used. <br /> <br />Water Suooly <br /> <br />. Naturally, unless water is available from precipitation, groundwater, or irrigation <br />there can not be consumptive use from crops. In areas of the arid and semi-arid West <br />such as the Western Slope of Colorado the major source of water is irrigation. In <br />these areas the quantity and seasonal distribution of the available water suppl y will <br />affect the consumptive use characteristics of agricultural lands. <br /> <br />. Currently, the State is compiling data that will allow us to tie structures to irrigated <br />acreage for 4 to 7 diversion structures. These data will be used to provide an <br />indication of the amount and time that areas are not being supplied with their <br />optimal water needs. <br /> <br />Plant Growth Characteristics <br /> <br />. Plant growth characteristics define stages for the water-use characteristics during <br />different times in the plants development. These stages include the emergence and <br />development of complete vegetative cover, the period of maximum vegetative <br />cover, and finally the maturation stage. Table 1 shows the crops that we currently <br />have complete data for. . <br /> <br />Table 1: Crop Numbers and Characteristics" <br /> <br />Crop Starting Ending Planting Harvesting Season Days to <br />'No. Crop Name Temp. Temp. Month Month and Length Full <br /> ("F) ("F) and Day Day in Days Cover <br />1 A1fana 50 28 Aprtll Oct15 197 75 <br />2 Grass Pasture 45 45 Aprtl15 Oct 1 169 110 <br />3 Orchard with cover 50 45 March 31 Oct 1 184 66 <br />4 Orchard wfthout cover 55 50 March 31 Oct 1 184 66 <br />5 Barley 45 45 Aprtll August 1 137 71 <br />6 Grapes 55 50 Aprtll0 Sept 30 173 30 <br />7 Dry Beans 60 32 May 25 Sept 15 112 55 <br />8 Sprtng Grain 45 32 Aprtll Aug.15 137 52 <br />9 Com Silage 55 45 May 13 Oct.9 140 72 <br /> <br />9/30/94 - September Update (1.14-9) <br /> <br />6 <br /> <br />IDS Group, CSU <br />