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Section 785.19 (d) Continued. • The floodplain is irrigated by several adjudicated diversion ditches along the entire reach of the Canadian River within the general area, as described in Exhibit 25, Kerr Coal Water Rights Documents. Surface water quality, based upon samples taken ai USGS Gaging Station 06619400 at the upstream end of the general area, analyses of which are given in Table 13, USGS Canadian River Water Quality Data, is suitable to support the essential hydrologic function of flood-irrigation. The third subject area, the lower reach of Bolton Draw downstream from mining activities, also has the essential hydrologic function of flood irrigation. An adjudicated diversion, Bolton Ditch, irrigates the lower reach of Bolton Draw with return flow from another ditch, which diverts water from the Michigan River basin. Bolton Ditch normally carries 2 cfs to irrigate approximately 90 • acres for grazing purposes only, and is the only facility which supports the essential hydrologic function of flood irrigation in Bolton Draw. The dam at the headgate of the ditch does not supply any irrigation water. Its primary purpose is to provide enough head to fill the ditch. The quality of water in Bolton Ditch is suitable for irrigation use. Agricultural Significance The alluvial valley floor areas encountered along Bolton Draw, the Canadian River and the Illinois River as can be observed on Map 27, North Park Land Use, are in two categories of land use, i.e., as irrigated pasture or hay cropland and as non-irrigated rangelands. Lands along the Canadian River are used largely for cropland, while lands adjacent to the Kerr tipple in the Illinois River and the floodplain of Bolton Draw are used largely for grazing. The available information on the agricultural productivity of the the above areas is contained in the description of existing land 785-35