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• Section 822.11 <br />(c) The characteristics that support the essential hydrologic functions <br />of alluvial valley floors are those in 30 CFR 785.19(d)(3) and those <br />other geologic, hydrologic, or biologic characteristics identified <br />during premining investigations or monitoring conducted during the <br />surface coal mining and reclamation operation. <br />The mining and reclamation plan presented under Sections 780.11 and <br />780.18 is designed so as to preserve the essential hydrologic <br />functions of alluvial valley floors in the general area. The <br />essential hydrologic functions of the acknowledged alluvial valley <br />floors in the general area are described under Section 785.19(d), <br />and are summarized as follows: <br />I) Illinois River floodplain - subirrigation; <br />• 2) Canadian River floodplain - flood irrigation; and <br />3) Lower reach of Bolton Draw - flood irrigation. <br />The role of these alluvial valley floors in collecting, storing, <br />regulating, and making water usefully available for agricultural <br />activities will he preserved by preventing material damage to these <br />areas. The geologic, hydrologic and biologic characteristics <br />supporting the essential hydrologic functions of the alluvial <br />valley floors, described in detail under Section 785.19(d), are not <br />expected to be adversely affected. The characteristics which <br />support the essential hydrologic functions of alluvial valley <br />floors in the adjacent area will be monitored as described in <br />Section 822.14. The supporting characteristics, such as water <br />quantity and quality in the alluvial valley floors, will be re- <br />established to baseline conditions by implementing the mitigative <br />measures described in Sections 780.21 and 785. 19(d). <br />• <br />822-2 <br />