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}-. • • • • Mr. Larry Reschke -3- January 13, 1982 2) A more detailed description of the furrow irrigation method practiced in each area in or adjacent to the permit area must be provided. This information is necessary to decide if this furrow irrigation should be considered a type of flood irrigation. 3) If it is determined that furrow irrigation is not a type of flood irrigation, the Division must consider the potential for flood irrigation. Therefore, the applicant should submit information concerning the capability of the area to be flood irrigated. (See part II of the OSM June 11, 1980 Technical Guidance Paper for Alluvial Valley Floor Investigations for additional details.) 9) The applicant must provide information concerning subirrigation of the lands in question. For these areas adjacent to the permit area, a field reconnaissance to identify those areas where the vegetation suggests subirrigation may be sufficient. Foz those areas within the permit area, however, site-specific information must be provided concerning crop type, rooting depth, and alluvial water levels during the growing season. If the above information is not provided, the Division would go forward with a "worst case" AVF determination. This would likely be that all the area designated ds Qgy is an Alluvial Valley Floor. THE FOLLO[JING INFORMATION [40ULD BE REQUIRED IP THE DIVISION DETERMINES THAT AN ALLUVIAL VALLEY FLOOR EXISTS IN OR ADJACENT TO THE PERMIT AREA: If Alluvial valley Floors are identified, the applicant must submit site- specific information concerning the productivity of the Alluvial Valley Floor and the economic significance of the Alluvial Valley Floor to the farm's production. In the absence of actual information, the worst case assumption is that any Alluvial Valley Floors are significant to agri- culture. In addition, the application must contain information describing the surface and ground water that supply the Alluvial Valley Floor, and identifying the essential hydrologic functions of the AVF. For any Allu- viaZ Valley Floor within the permit area, the following must be provided: 1) One year's baseline data for the quantity and quality of surface and ground water (for a perennial stream, gaging stations with continuous recorders would be appropriate), 2) A description of the exact nature of the hydrologic relationship of surface water and ground water (low flow investigations to determine if the perennial stream is a gaining or a losing stream would be appropriate), and 3) A description of the role of subirrigation in the Alluvial Valley Floor including site-specific data on water table fluctuations during the growing season (alluvial monitoring wells equipped with continuous recorders would be appropriate).