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CRDSS <br />TASK MEMORANDUM 1.07-2 <br />Physical Characteristics Database <br />Physical Characteristics Database Population <br />1.0 ISSUE <br />This task memorandum describes the physical characteristics database population efforts for Year 1 of <br />the CRDSS. <br />2.0 DISCUSSION/ANALYSIS <br />The physical characteristics database contains relatively stable data that are not necessarily tied to a <br />location. Time series data are contained in the historical database, and spatial data are contained in the <br />spatial database. <br />The data in the physical characteristics database are contained in INFORMIX tables. Tables are <br />?locations? for data within the INFORMIX database. <br />The physical characteristics database has 12 categories of data. Each category is described below, <br />including the population efforts in Year 1. The sources and schedule for population of the physical <br />characteristics data are presented in Tables 1 and 2. <br />Crop Growth Characteristics ( table) <br />crop character <br />Crop growth characteristics describe water use characteristics unique to each crop at each stage of the <br />growing season. Crop growth characteristics describe the evaporation occurring with a specific crop at a <br />specific stage of growth. These data are needed to operate the Consumptive Use (CU) model. <br />There are daily characteristics that are used with the Penman-Monteith method (both basal and mean <br />coefficients), and monthly characteristics that are used with the Soil Conservation Service (SCS) Blaney- <br />Criddle method (XCONS2 and CRDSS-CU). <br />The CU model allows the user to select more than one method at a time for the same area. Therefore, <br />there may be multiple types of crop growth characteristics in the same input file for the CU model <br />program. <br />Beginning and Ending Dates of the Growing Season ( ) <br />crop growth <br />The CU model needs a beginning and ending date for each crop in a particular area. Default dates have <br />been collected, but the accuracy of these dates depends on climate conditions. If there is an early frost at <br />the beginning or the end of the season of sufficient intensity and/or duration, the growing season will be <br />shorter than the default dates. These frosts are defined by the mean air temperature and define the <br />earliest and latest moisture use. <br />1 <br />A 275 01.09.95 1.07-2 Lange <br />