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I J I I I I I I I I I I I I I I I I I Consumptive Use Model added by editing the common input file or by making changes using SPMAP. Each crop can have a soil specification in the soil type, for the south plate there are three soil types that are supported. o Planting Month and Day - This is the default planting date if it occurs after the frost date determined by temperature data. If the date specified is before the frost date, the frost date is used. o Harvest Month and Day - With the planting date these two variables define the growing season of the crop and the time it will be consumptively using water. o Planting Full-Cover - This coefficient defines the time in which the crop will reach full-cover and takes into account some of the seasonal variability of the crop. Different consumptive use values can be assumed before and after the crop reaches full-cover. o Length of Season - This is the length of the growing season in days. o Plant and Frost Temperatures - The planting temperature is the what the temperature should be above for planting, and the frost temperature is the point at which the plant would probably die if the it reached that cold. These temperatures are used to determine the planting and harvest dates. o Management Allowed Depletion (MAD) . Management allowed depletion is the maximum amount of water that is allowed to be depleted from the soil root zone without any perceived stress in the crop.This should be entered as a percentage (Le. 50% => 50). o Root Depth (ft) - The depth of maximum root growth in feet. o Available Water Holding Capacity (A WC) - This is the amount of water that can be held in a soil type in inches of water perfoot of soil. Each soil type (sand, loam, and clay) can have only one value for A We. The A WC is multiplied by the area of the farm to determine the volume of water that can be stored in the soil. o Soil Type - There are three soil types that can be selected (sand, loam, and clay) for each crop. Values for other crop coefficients (except A WC) can be unique for each combination of crop and soil, for example corn-loam and corn-sand. 2.5.9 Water Sunnlies This window contains records for when irrigation water was available for an area. Data is supplied by the ditch master file. The program adds inputs from ditch allotments and precipitation and applies it to the consumptive use computed for the crops. If the crop is short of water from these inputs the balance is assumed to come from well data. You can elect to use water supply information or not using the Use Water Supply Data check box in the Consumptive Use window. Version 1.1 9 The Consumptive Use Window