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Comments and Concerns <br />The development of return flow patterns for this task 1) utilizes a widely acceptable method, 2) <br />is reproducible, and 3) is based on sites representative of CRDSS basin alluvial aquifers. It is <br />recommended that the patterns previously developed be replaced with the patterns developed in <br />this task. Currently, all irrigation structures in Divisions 4, 5, and 6 and the majority of <br />structures in Division 7 have been assigned return flow pattern "1". As CRDSS basin models are <br />updated, the modeler should consider assigning pattern " 2" to irrigation structures which irrigate <br />lands further from the point of diversion. <br />It is difficult to develop return flow patterns to accurately represent the variations in geology <br />seen in the CRDSS basins, and difficult to define adata-centered methodology for assigning <br />patterns to individual irrigation structures. However, it is believed that the monthly and daily <br />return flow patterns developed and described in this memorandum adequately represent typical <br />geologic conditions and irrigated acreage locations in the CRDSS basins and are appropriate for <br />use in the basin modeling efforts. <br />Page 12 of 12 <br />