Hydrogeologic Significance of the Correlation Between Well-Yield Variography and Multiscale Bedrock Geologic Structures

A spatial analysis of ground-water yields has been performed that expands upon previous work by Drew and others (1999) in which the spatial continuity of 939 water well yields within the Pinardville quadrangle, New Hampshire, has been associated with the fracture properties of the crystalline basement rocks. This expanded analysis was performed on updated and new geologic map data, new fracture set data and analyses, and a set of water well yields that was expanded by 752 newly located well to1,691wells. Variogram mapping of the water well yields formed the basis for the synthesis of the spatial continuity in well yield with the geological data. A variety of associations were found that directly relates the spatial properties of well yields to the characteristics and structure of the crystalline bedrocks in the quadrangle.