Ground-water data for Michigan, 1980

Model Refinement and Simulation of Groundwater Flow in Clinton, Eaton, and Ingham Counties, Michigan

“…For communities within the study area, data on withdrawals from 1970 to 1990 were primarily based on records furnished by municipal suppliers, published in annual data reports of the USGS Thompson, 1971, 1973;Huffman, 1974aHuffman, , 1974bHuffman, , 1975Huffman, , 1976Huffman, , 1977Huffman, , 1979aHuffman, , 1979b1980;1981;1982;1983;1984;1986;1988;Huffman and Whited, 1988;1991;1993), or included in previous studies of the area. Additional data are available in a report by Baltusis and others (1992), who summarized sources and annual withdrawals of groundwater for communities in the Lower Peninsula of Michigan.…”

“…Direct runoff is associated with the component of precipitation that exceeds the infiltration capacity of the soil and flows overland directly into streams. Base flow is associated with the component of 1910 1915 1920 1925 1930 1935 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 and Thompson, 1971and Thompson, , 1973Huffman, 1974aHuffman, , 1974bHuffman, , 1975Huffman, , 1976Huffman, , 1977Huffman, , 1979aHuffman, , 1979bHuffman, , 19801981, 1982, 1983, 1984, 1986, 1988Huffman and Whited, 1988, 1991, 1993and Baltusis and others, 1992.) 6 1975-80, 1989-90, 1994- precipitation that infiltrates the soil and percolates below the plant-rooting depth, where it can enter (recharge) the groundwater system.…”