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CRDSS <br />TASK MEMORANDUM 1.14-2 <br />Consumptive Use Model <br />Consumptive Use Data Input Requirements <br />1.0 ISSUE <br />This task memorandum provides an evaluation of the consumptive use data input requirements. <br />2.0 DISCUSSION/ANALYSIS <br />Introduction <br />The consumptive use (CU) model will incorporate geographic information system (GIS) capabilities for <br />spatial data processing to calculate the consumptive use in an area over a chosen period of time. The CU <br />model will provide the user with a modeling environment that includes the selection and modification of <br />parameters. Standard baseline scenarios based on the numbers for the U.S. Bureau of Reclamation <br />(USBR) Colorado River System Consumptive Uses and Losses Report, 1981-1985 will be constructed, <br />but the user will have the option of changing the baseline scenarios to construct alternative scenarios. <br />Once an area and a period of time are selected, the CU model will use a data management interface <br />(DMI) to retrieve information regarding the area being considered, for the time frame selected, and the <br />modeling variables needed for the computations. The DMI will access the various databases and return <br />data needed for modeling, such as crop type, planting dates, livestock amounts and type, municipal areas, <br />population density, reservoir characteristics, temperature maximum and minimums, etc. These data and <br />corresponding attributes will be passed back to the CU model and an estimated consumptive use amount <br />will be calculated. <br />Overview of Types of Data Stored in Databases <br />The physical characteristics, historical, user, and station databases will reside in INFORMIX and will be <br />relationally designed to allow the user to extract data using Structured Query Language (SQL) or an <br />equivalent method. The spatial database will be based on a GIS. <br />The spatial database will display data in three graphical formats using a GIS: (1) raster maps that are <br />based on a grid system where each cell created by the grid is assigned one value, (2) vector maps that are <br />line segments defined by their end points where connected line segments or polygons can be assigned <br />one value for each polygon, and (3) icon-based site maps with an icon representing the data collection <br />site. <br />The physical characteristics database will store attribute data for crops, reservoirs, and other physical <br />entities. The historical database will store historical data, such as climate parameters and diversion <br />records. The station and user databases will store information about the users of the CRDSS and general <br />information about the different types of stations, such as alternate names for the stations and types of <br />data collected at the stations. <br />1 <br />A275 01.09.95 1.14-2 Lange <br />