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• function of flood irrigation is supported by surface water <br />availability. The role of the alluvial valley floor in collecting, <br />storing, regulating and making surface water available to <br />agriculturally useful plants is dependent on the following <br />characteristics: 1) reliable source of water; 2) diversion <br />structures used for irrigation; 3) surface water quality adequate for <br />agricultural use. The floodplains are irrigated by several <br />adjudicated diversion ditches within the proposed permit and adjacent <br />area. Surface water quantity and quality is suitable to support the <br />essential hydrologic function of flood-irrigation. <br />Essential Hydrologic Functions <br />The mining and reclamation plan presented under Rule 2.05.3 will be <br />conducted in a manner so as to preserve the essential hydrologic <br />functions of alluvial valley floors in the proposed permit and <br />adjacent area. The possible alluvial valley floors and their <br />corresponding essential hydrologic functions are listed as follows: <br />• 1) Middle Creek floodplain -flood irrigation; and <br />2) Fish Creek floodplain -flood irrigation. <br />These floodplains are identified on Map 5, Fish Creek Tipple <br />Hydrology. A short segment of the haulroad is located on the Middle <br />Creek floodplain and constitutes the only potential impact <br />attributable to the Fish Creek Tipple operation. The portion of the <br />Fish Creek floodplain that could be affected is downstream from the <br />tipple facility. The role of the above alluvial valley floors in <br />collecting, storing, regulating, and making water usefully available <br />for agricultural activities has been and will continue to be preserved <br />by preventing material damage to these alluvial valley floor areas. <br />The geologic, hydrologic and biologic characteristics supporting the <br />essential hydrologic functions of any alluvial floor within or <br />adjacent to the proposed permit area are not expected to be adversely <br />affected. Specifically, the flood irrigation systems present within <br />2.06-26 <br />