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<br />..... <br /> <br />OV.l60S <br /> <br />HYDROLOGIC MODELS INVENTORY <br /> <br />EVALUATION FORM <br /> <br />NAME OF MODEL: BASIN <br /> <br />FUNCTION: The BASIN program computes - <br />1. Irrigation farm delivery requirements, <br />2. Project diversion requirements, <br />3. Ground-water recharge, or <br />4. Basin outflow depending on the purpose of the study. <br />The program will also compute streamflow depletions or net change in ground <br />water recharge due to a change in cropping patterns or irrigated acreage. <br /> <br />AGENCY & OFFICE: Bureau of Reclamation <br />Nebraska Kansas Projects Office <br />Grand Island, NE <br /> <br />TECHNICAL CONTACT: Duane Woodward (307-261-5608) <br />North Platte River Projects Office <br />Mills, WY 82644 <br /> <br />MACHINE COMPATIBILITY: The program is written in Fortran IV and is on the <br />Cyber EE system. <br /> <br />DOCUMENTATION: There is a "USERS" manual developed by Fred Otradovsky and <br />dated 5-21-81. The program uses are explained along with the input data <br />requirements and example runs are provided. <br /> <br />1 <br />I <br /> <br />SPATIAL PRECISION: The program can calculate information for a Basin area, <br />Project area, farm size area or computation can be made for a unit area. The <br />study area can be divided into ten areas, each defined by a specific soil-rain <br />gage combination. <br /> <br />TEMPORAL PRECISION: The BASIN model makes computation on a monthly time step <br />by year. <br /> <br />OVERVIEW OF CAPABILITIES ASSUMPTIONS: Monthly computations of <br />evapotranspiration by crop can be made using four ET methods three versions of <br />Jensen-Haise and the Blaney-Criddle (TR-21). The ground water discharge is <br />computed by the R.E. Glover methods. Monthly rainfall infiltration by soil is <br />taken from curves developed using rainfall versus runoff data collected by <br />ARS-USDA. The program does a monthly soil moisture budget of the crop root <br />zone to determine when recharge will take place and determine the number of <br />irrigation applications required to maintain soil moisture for a crop. Basic <br />assumptions are: <br /> <br />1. The soil reservoir is the effective root zone of a given crop. <br />2. The maximum amount of moisture which can be stored in the soil reservoir <br />is the "Available Water" e~al to "Field Capacity" minus "Wilting Pointn. <br />3. The portion of rainfall that infiltrates the soil is equal to the total <br />rainfall on a field size area less runoff from that area. <br />4. Evapotranspiration includes transpiration from plants plus evaporation <br />from soil and plant surface. <br /> <br />I-lO <br /> <br />- <br />