Laserfiche WebLink
3. TEXT CHANGES <br />TABLE 3-1 <br />CHARACTERISTICS OF PICEANCE AND YELLOW CREEKS <br /> <br />Characlerlttlcs Pkxance Creek <br />At White River <br />Ye0ow Creek <br />Drainage area (square miles) 652.00 262.00 <br />Average annual discharge (acre-H) 24,270.00 0 1,340.00 a <br />Maximum daily discharge (cfs) 525.00 ~ 500.00 a <br />Minimum daily discharge (cfs) 0.50 ~ 0.00 a <br />Average daily discharge (cfs) 33.50 c 1.85 a <br />Maximum iattuitaaeous discharge (cis) 628.00 ~ 6,800.00 a <br />Sediment discharge (tons) 56,115.00 n 12,495.00 h <br />Maximum daily sediment discharge (tons/day) 6,090.00 ~ 290,000.00 a <br />Minimum daily :iedimem discharge (tons/day) O.10 c 0.00 a <br />Maximum TDS (rrtg/I) 1,200.00 d 2,090.00 h <br />Minimum TDS (tng/I) 670.00 d 489.00 b <br />e For the period 1972-1980. <br />b 1980 water you. <br />~ October 1970 io September 1984. <br />d 1984 water you. <br />Source: USGS Watu Resotace Dau <br />Conversion: ds x 1..9835 = aae-tat per day. <br />Creek. Horse Draw is very steep, small in size, and in the <br />extreme southeactem portion of the lease vact. Surface runoff <br />to this drainage basin is not exptxit~ to be affectod by <br />lease operations. <br />Total drainage area to Yellow Creek within the lease <br />area is 13.1 square miles, or about :5 percent of the 262 <br />square mile basin area of Yellow Creek. Three unnamed <br />ephemeral tributaries to Yellow Creek drain the proposed <br />mine site. Flow in Yellow Crcek is intermittent in much <br />of its middle reach and perennial in some upstream reaches <br />and in the lowest several miles of the stream. Flow is <br />dependent on annual precipitation, snowpack depths, <br />thickness of the alluvium, and for several years untr7 1982, <br />on mine water discharge from Oil Shale Tray C-a. Average <br />daily discharge from Yelow Creek Hero the confluence with <br />the White River is 1.85 cubic feet per second (cfs), or about <br />1,340 acre-feet per year. The gauge at the mouth of Ye0ow <br />Crcek was discontinued in 1982.Only l0 years of discharge <br />records ere available. Extremes for the period of record <br />include several oo-flow days and a maximum discharge of <br />6,800 cfs on September 7, 1978. This was a flash Oood <br />that carried a sediment load of 290,000 tons. The high Flow <br />followed an unusually intense thunderstorm, most of which <br />fell only in the downstream one-third of the Yellow Creek <br />drainage. The suspended sediment load in Yellow Creek <br />at White River for 1980 was about 12,000 tons per year. <br />The 13.1 square mile drainage area within the leases could <br />generate a 100-year peak-flow of 80 cfs (Kircher, Choquette <br />and Richter 1985). This would be the 100-year storm <br />contribution from the drainage areas within the leases to <br />Yellow Creek. <br />3-3 <br />