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_17_ Surface Water All three active coal mines are located on northeasterly flowing tributaries of the Canadian River. The Bourg Strip i~1ine is located entirely within the drainage basin of Mann Draw. The Marr Strip is drained oy four tributaries, Sudduth Draw, Williams Uraw, Bush Draw, and Bolton Draw. The Canadian Strip is drained entirely by Bolton Draw. The drainage areas and flows for these streams are contained in Table 2 and the location of streams can be found in Figure 2. The U.S. Geological Survey has established two combination stream gaging water quality monitoring stations on the Canadian River. Station No. 06619400 is located upstream of the anticipated mining near Lindland, Colorado (Figure 2). Station No. 0661y45U is located downstream of the anticipated mining near Brownlee, Colorado. These stations have been monitored since October, 1977. A statistical summary of the surface water quality data from these two stations is contained in Tables 3 and 4. These tables were taken directly from Kuhn, 198`2, and cover the period from Uctouer, 1977 to September, 1980. Table 5 contains a summary of the flow for these stations during water year 1980. A comparison of the unit runoffs for the U. S.G.S. gaging established in the study area (Column 6 of Table 2) indicates that the streams flowing from the interior of the North Park Basin to the Canadian River contribute, per unit area, one-tenth as much flow to the river. This is due to the greater rates of precipitation which falls on the i4edicine Bow Range (Continental Divide) which form the northeastern ono southern surface water divides of the Canadian River Basin. A U.S.G.S. stream gaging and water quality station is located in Williams Draw (Station No. 06619420), below the Marr Strip (Figure 2). Williams Draw is an intermittent stream with a total drainage area of 4.5 square miles (2,880 acres). A statistical summary of water quality analyses from July, 1979 to October, 1980 is presented in Table 6 (Kuhn, 1982). Flows for Williams Draw in water year 1980 are given in Table 5. The calculated adjusted unit runoff value for Williams Draw is 0.047 acre-feet per acre of drainage basin. The ~~tarr Strip is located 1.5 miles upstream of the confluence of Williams Draw with the Canadian River. One stock pond is located 0.5 miles downstream of the mine. Mann Draw is located approximately 4 miles northwest of the gaging station on Williams Uraw. Mann Uraw is an intermittent stream with a total drainage area of 3.39 square miles (2,170 acres). An estimate of the average annual runoff was made by Leonard Rice L'onsulting Water Engineers, Inc. The estimated flow was obtained by multiplying the adjusted unit runoff value for Williams Draw, U.U49 acre-feet per acre, by the total area of Mann Draw. The resulting estimate was 106 acre-feet/year. There is one stock pond located on Mann Uraw, about 2,000 feet downstream of the Bourg Strip Dline. The Bourg Mine is located 1.85 miles upstream or the confluence of Mann Draw with the Canadian River.