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The Lake Minnequa area, located immediately south of the Arkansas River, includes southern Pueblo, Colo., and is mantled with as much as 46 feet (14 metres) of alluvium covering bedrock consisting of the Upper Cretaceous Pierre Shale and Niobrara Formation. Surface water enters the study area by way of the Minnequa Canal and the St. Charles Flood Ditch. The water is stored in Lake Minnequa, St. Charles Reservoir No. 2, and St. Charles Reservoir No. 3, which have a combined surface area of 1,056 acres (427 hectares) and a storage capacity of 12,715 acre-feet (15.7x10° cubic metres). Seepage from Lake Minnequa and St. Charles Reservoirs No. 2 and No. 3 is the major source of water to the alluvial aquifer. Ground-water movement is to the east and northeast approximately paralleling the slope of the bedrock. The surface and ground waters are very hard, with calcium and sulfate as the predominant dissolved chemical constituents. The depth of the water table ranges from 0 to 40 feet (0 to 12.2 metres). About 7.1 square miles (18.4 square kilometres) of the aquifer has a water table of less than 10 feet (3 metres) below land surface. A 0.5-square-mile (1.3-square-kilometre) area immediately south of Lake Minnequa has a water table less than 6 feet (1.8 metres) below land surface, with marshy, waterlogged soil. Lake Minnequa is the principal cause of the shallow water table and resulting waterlogged soil. The bedrock hill east of Lake Minnequa and ground-water flow in the aquifer also contribute to the shallow water table. To eliminate the waterlogging problem, the water table would have to be at least 6 feet (1.8 metres) below land surface. The water table could be lowered by reducing the lake level. This could be accomplished with a reduction in storage or by dredging. The water table could also be lowered by a network of dewatering wells, a tile-drain system, or a drainage-ditch system in the waterlogged soil area. Dewatering the aquifer may result in some domestic wells going dry and drying of the soil may cause differential settling of some structures. A 6-foot (1.8-metre) depth to the water table could also be achieved by raising the land surface using fill material. Other alternatives include establishing restrictive zoning for the waterlogged area or converting the land to a use compatible with the shallow water table. . COLORADO WATER RESOURCES

Waterlogging in an alluvial aquifer near Lake Minnequa, Pueblo, Colorado