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Section 779.16 (a) Continued. Revised 11/20/80 • streams discharge into the perenniai Canadian River about 2 miles northeast from the mine plan area. Tipple Area The tipple area is located on the floodplain of the Illinois River, a perennial stream which flows north into the Michigan River at Walden, Colorado. The facilities at the tipple are built on an earth-fill bench above the 100-year flood level, as shown on Map 17a, Kerr Tipple Area Hydrology. Surface water in the marsh sur- rounding the tipple is stagnant except in the spring when snowmelt causes flooding and flow in the marsh. The marsh is drained by several culverts under the Union Pacific Railroad line and an irri- gation ditch which runs around the north side of the tipple area, Surface water drainage patterns are shown on Map 17a, Kerr Tipple Area Hydrology. C~ Surface [dater Drainage Systems: Water Quantity General Area Streamflow characteristics of the Canadian River in the general area have been continuously monitored by the USGS for several years. The records from Lwo USGS stream gaging stations on the Canadian River are summarized in Table 11, USGS Canadian River Flow Data. The USGS gaging stations are shown on Map Sa, North Park Hydrology. This information reveals that the general area contain- ing the Kerr Mine is drained by the Canadian River, a perennial stream which has a base flow of 4 cubic feet per second (cfs). Mine Plan Area The intermittent drainage of Williams Draw has been monitored by Kerr Coal from the first runoff occurrence in April, 1980 to the present using a Parshall flume installed by the USGS at Station 06619420 in July of 1979. This drainage receives runoff from an • area undisturbed by 779-40 as