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-15- identified in Sudduth Draw (p 785-16aa). The analysis of regional flood irrigation practices (Exhibit 38) does not indicate that the area is capable of flood irrigation. Alluvial Valley Floors - Illinois River - Findings 1. The proposed surface coal mining operations would not interrupt, discontinue, or preclude farming on an alluvial valley floor. The tipple is already in existence. Areas immediately adjacent to the loadout include the marsh, a lumber mill, and the railroad. The bench itself, although located within the floodplain, is in a marshy area that would not have supported agricultural activities prior to bench constructions. 2. The proposed surface coal mining operations would not materially damage the quantity and quality of water in surface and underground water systems that supply those alluvial valley floors or portions of alluvial valley floors. Nearby areas within the Illinois River Alluvial Valley Floor are used for pasture and grazing lands, irrigated hay field, and as wildlife habitat (785-36 ). Tipple operations would not diminish the supply of surface water to the Alluvial Valley Floor. Monitoring of sediment pond effluent and the adjacent irrigation ditch has not indicated any adverse change in water quality. The tipple is located in a ground water discharge zone; surface flow is diverted away from coal stockpiles; and structures and stockpiles are located above the alluvium on a compacted man-made fill, therefore no effects are anticipated. 3. Surface coal mining and reclamation operations would be conducted to preserve, throughout the mining and reclamation process, the essential hydrologic functions of the alluvial valley floor. The tipple operation would not physically disturb adjacent alluvial valley floors. The supply of surface water supplied to the alluvial valley floor would not be affected by the loadout facilities. Alluvial Valley Floor - Canadian River - Findings 1. The proposed surface coal mining operations would not interrupt, discontinue, or preclude farming on an alluvial valley floor. The permit area is located 1/2 to 1 mile from the alluvial valley floor, and would not affect farming activities. 2. The proposed surface coal mining operations would not materially damage the quantity and quality of water in surface and underground water systems that supply those alluvial valley floors or portions of alluvial valley floors.