Preliminary study of wastewater movement in Yellowstone National Park, Wyoming, October 1976 through September 1977

Studies were made from October 1976 through September 1977 to determine the effects on lakes and streams of wastewater effluents that percolate from sewage lagoons at four sites in Yellowstone National Park. Ground-water mounds have built up under the lagoons as percolation of effluents occurred. Percolating effluents mix with ground water and move down the hydraulic gradient in a direction generally perpendicular to the water-level contours. Maps showing chloride and sulfate concentrations, specific conductance of water in wells, and water-level contours indicate the most likely areas and directions of movement of percolating effluents.