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<br />. <br /> <br />. <br /> <br />2) DEMAND-BASED SYSTEM OPERATING PLAN <br /> <br />Purpose: <br /> <br />Develop a demand,based system operating plan for the ditch <br />companies to extend existing water supplies throughout the <br />irrigation season by modifying the operations of the systems from <br />current practice, <br /> <br />Methods: <br /> <br />For a demand-based system operating plan to be most <br />successful, the true crop water demands must be known, Some <br />form of irrigation scheduling must be employed to accomplish <br />this, To begin the process of implementing improved scheduling <br />techniques, Boyle will evaluate data compiled from the irrigator <br />interviews regarding scheduling and management decisions, <br />Using this information, and in consultation with the SCS, <br />information regarding alternative irrigation scheduling techniques <br />which could be adopted by water users will be deveioped and <br />disseminated, Heavy reliance will be piaced on information <br />available from the SCS and Extension, The SCS, Extension, and <br />the ditch companies will be requested to develop, to the degree <br />practicable, a soil moisture monitoring network and on farm <br />scheduling practices, <br /> <br />To develop a management tool, an evaluation of available <br />methods for assessing seasonal supply versus demand <br />conditions will be made, This evaluation will consist of a <br />comparison of existing database management software versus <br />development of custom software in FORTRAN, The evaluation <br />will be limited to comparing the advantages and disadvantages of <br />using DBASE, Supercalc, or a custom program to be developed <br />by Boyle, Upon completion of the software evaluation, a single <br />method will be seiected and the seasonal supply/demand <br />procedure designed using a monthly time,step, <br /> <br />The demand-based system operations software will first be used <br />to evaluate the potential for long term and partial season water <br />leasing, Historical inflow data developed in the Phase I studies <br />will be used to quantify water supplies, The demand conditions <br />will be quantified through incorporation of the demand forecasting <br />methodology developed in Task 1, Consideration of <br />replenishment of soil moisture reserves will be included in the <br />simulation, Through this analysis, the long term potential of <br />surpluses, deficiencies, and risk associated with water marketing <br />can be evaluated on a land parcel specific basis, <br /> <br />The demand,based system operations software will be used to <br />evaluate projected conditions for the 1990 season, The supply <br />conditions will be quantified through incorporation of the SCS <br />runoff forecasts, The demand conditions will be quantified <br />through incorporation of the demand forecasting methodology <br />developed in Task 1, The use of the average, wet, or dry <br /> <br />3 <br />