The recoverable volume of ground water in abandoned coal mines near Roslyn, Wash., is estimated to be 20,000 acre-feet. During times of drought, pumping this water into the Cle Elum and Yakima Rivers for use in irrigation downstream should present few major water-quality problems. Wells at seven locations should be sufficient to withdraw the recoverable water from nine separate reservoirs within the mines. Under normal recharge (precipitation) conditions, these reservoirs would refill in about 6 years. (USGS)