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<br />OGJ.j67 <br />Task 1.14(b) - Consumptive Use Prototype Development <br /> <br />3.0 ~iscussion <br /> <br />The objectives for Phase IIa are to: <br /> <br />. Develop and implement a consumptive use model for the Colorado River Basin by <br />using the Gunnison Basin as a prototype. This consumptive use model will estimate <br />the amount of water use or depletion due to human activities. <br /> <br />. Implement recommendations for changes to the application in the State of Colorado <br />of the USBR methods manual. These changes include the addition of a soil moisture <br />budget and an accounting for the effective precipitation during the dormant season <br />of crops (winter). <br /> <br />. Maintain the same categories of water consumption as the USBR's "Colorado River <br />System Consumptive Uses and Losses Report," which is produced every five years. <br /> <br />. Verify the 1985 values for the USBR report for the Gunnison Basin using the <br />CRDSS CU prototype. <br /> <br />. Develop and link the CRDSS Infonnix and GRASS databases through DMls (data <br />management interfaces) and a GRASS to Infonnix link. <br /> <br />. Coordinate with the USBR in the development of the 1986-1990 "Colorado River <br />System Consumptive Uses and Losses Report." <br /> <br />. Develop a Graphical User Interface (GUI) that will display the parameters of a <br />baseline scenario for the Gunnison Basin (based on 1985 data), and allow the user <br />to modify the baseline scenario in order to develop new scenarios that can be stored, <br />retrieved, and used as model input. <br /> <br />3.1 CU Model Design <br /> <br />The CU model will provide the user with a modeling environment that includes the <br />selection and modification of parameters used to estimate consumptive use for a given area <br />and time period.' <br /> <br />3.1.1 Selecting Areas <br /> <br />The CU model will either communicate directly with the database through a <br />Geographical Resources Analysis Support System (GRASS) and Informix link and use a <br />Data Management Interface (DMI) to retrieve information regarding the area being <br />considered. The GRASS-Informix link uses location and spatial extent for the area <br />selected from the Geographical Information System (GIS) GRASS and retrieves <br />corresponding data from the database such as population densities, elevation, crop-type, <br />and other spatial data. The DMIs will access the various databases and return non-spatial <br />data needed for modeling; such as, crop characteristics, planting dates, livestock water- <br />use characteristics, reservoir characteristics, weather time series, etc. These data and <br />corresponding attributes will be passed back to the CU model and an estimated <br />consumptive use amount will be calculated. <br /> <br />One of the more recent design considerations has been to determine what types of <br />areas the user will be interested in estimating consumptive use for. Some possibilities <br />include river basins, hydrologic units, single irrigated parcels, and water divisions and <br />districts. Coordination with the database tasks has yielded a database capable of storing <br /> <br />9/30/94 - September Update (1.14-9) <br /> <br />2 <br /> <br />IDS Group, CSU <br />