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<br />. <br /> <br />. <br /> <br />. <br /> <br />models to generate lagged stream depletions. The computer models generated monthly stream <br />depletions by using either the HI Model unit response functions or the Stream Depletion Factor <br />(SDF) procedure. <br /> <br />Presumotive Deoletion Factors <br />The Amended Rules define several presumptive depletion factors. These presumptive <br />depletion factors are described in Table II.C-2. <br /> <br />o. <br />1 <br />2 <br />3 <br />4 <br /> <br />TABLE II.C-2 <br />Amended Rules Presumptive Depletions Factors Definitions <br />Amended <br />Rule No. <br />4.2.a <br />4.2.b <br />4.2.c <br />4.2.d <br /> <br />] <br />I <br /> <br />Description <br />sup lemental Wells, flood and furrow irrigation <br />Sole Source Welis, flood and furrow irrigation <br />Sole Source Wells, sprinkler irrigation s stems <br />Other uses <br /> <br />Factor <br />0.30 <br />0.50 <br />0.75 <br />Case by Case Determination <br /> <br />Rule 4.2.d states the following: <br /> <br />For diversions of ground water for other uses, the state imd division engineers shall <br />determine stream depletions based on information submitted by the well user and the <br />individual facts and circumstances of each case or may establish presumptive stream <br />depletions for particular uses. <br /> <br />"Other Uses" refers to uses other than irrigation. This includes but is not limited to <br />municipal, commercial, livestock feedlots, and industrial wells. In preparation of the '1996-1999 <br />Arkansas Rule 14 plans, presumptive depletion factors for several "other use" wells have been <br />developed. Those factors have been incorporated into CWPDA's database. <br /> <br />For any non-irrigation wells for which a presumptive depletion factor had not been previously <br />determined during development of a Rule 14 plan, a factor was determined in this study. This was <br />done primarily to simplify the analysis. Generally, this included the wells of municipal users along <br />the main stem of the Arkansas River. In CWPDA Arkansas Rule 14 plan development and <br />operation, a presumptive depletion factor of 1.00 has been used for thl3se wells. A factor of 1.00 <br />was used to reduce the engineering cost for the plan development. This assumption was possible <br />since many of the entities measure wastewater and lawn return flows. These can be easily <br />calculated as a percentage of irrigation water use based on some general assumptions that were <br />acceptable to the State Engineer. <br /> <br /> <br />CWPDA: Sec II.C <br /> <br />10/7/99 <br /> <br />Page 3 <br />