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<br />" OU;lj68 <br />Task 1.14(b) - Consumptive Use Prototype Development <br /> <br />spatial data locations in relation to a particular river basin, hydrologic unit, water <br />division, or water district, These areas will be selected individually from menu items in <br />the model's Gill, These menu items will include tables with all the possible areas listed, <br /> <br />A more flexible GIS approach to selecting the area is a design feature considered for <br />year 2, Part of this GIS approach would be to allow the user to select multiple individual <br />areas such as two water districts or five irrigated parcels using a map displayed in the <br />Visual Data Browser and a mouse to make multiple selections, <br /> <br />3,1.2 Selecting Time Periods <br /> <br />The CU model will allow the user to select one or multiple years for the consumptive <br />use calculation and to view averages and/or portions of a year to determine peak <br />irrigation periods from the model's output (1975 -1992 is the period of record that is <br />available), <br /> <br />3,1.3 Selecting Input Data <br /> <br />The CU model inputs data via flat files, which are simply ASCII text files, The <br />underlining computational features are developed in FORTRAN. These features allow <br />the user to prepare standard input files that are text based and can be run with the CU <br />model. The standard input files include comments, labels, and titles for all the <br />components in the file itself, <br /> <br />The user will be able to select the evapotranspiration estimation method desired (SCS <br />Modified Blaney-Criddle (Be) or Penman-Monteith Reference Crop (PM)). With the <br />SCS Modified Blaney-Criddle method the user can then specify the Original USBR <br />Blaney-Criddle or the Enhanced version, The Enhanced USBR Blaney-Criddle method <br />includes a soil moisture budget and an accounting for the effective precipitation during <br />winter, Similarly, the Penman-Monteith Reference Crop option allows the user to select <br />alfalfa or grass as the reference crop. <br /> <br />A planting and harvesting date can be entered by the user, and minimum mean <br />temperatures for the beginning and end of the season. Default values have been entered <br />for each crop. <br /> <br />Detailed soil data will be included (Le. each combination of crop-type and soil-type <br />will be saved for anal ysis). The soil data will be used to keep track of a soil moisture <br />budget year-round. <br /> <br />The CU model is being designed to have the flexibility for changing the various <br />coefficients used to estimate consumptive use for agricultural and other uses. There will <br />be options for changing livestock consumptive use coefficients reservoir evaporation <br />characteristics, etc. Default values will be used unless a user chooses to modify these <br />parameters. <br /> <br />3.1.4 Viewing Output <br /> <br />The user is able to view the results of a consumptive use calculation on the screen and <br />the capability to send the results of the calculation to the printer. The draft output files <br />have been given to the State for comments and suggestions are being implemented. <br /> <br />3.1.5 Considering Winter Precipitation <br /> <br />9/30/94 - September Update (1.14-9) <br /> <br />3 <br /> <br />IDS Group, CSU <br />