Natural Resources, and the West Dakota Water Development District, which repre-

resource center that provides an economic base for western South Dakota through tour-ism, agriculture, the timber industry, and mineral resources. In addition, water origi-nating from the area is used for municipal, industrial, agricultural, and recreational pur-poses throughout much of western South Dakota. The Black Hills area also is an important recharge area for aquifers in the northern Great Plains. Population growth, resource develop-ment, and periodic droughts have the poten-tial to affect the quantity, quality, and availability of water within the Black Hills area. Growth has resulted in competing inter-ests for available water supplies. The Black Hills Hydrology Study was initiated in 1990 to address these concerns. This long-term study is a cooperative effort between th