Ground water in the Hartford, Stamford, Salisbury, Willimantic and Saybrook areas, Connecticut . iency of the drift in this respect dependslargely on the rate of underground drainage, the three principal fac-tors of which are porosity, the arrangement of layers having differentporosities, and the topography of the bedrock on which the water-bearing bed rests. The most porous beds, as, for example, the dunesands of the Connecticut River vaUey (PI. I, B), absorb water mostrapidly, but they also allow the water to circulate most freely andare therefore most rapidly drained. Impervious materials,
Ground water in the Hartford, Stamford, Salisbury, Willimantic and Saybrook areas, Connecticut . iency of the drift in this respect dependslargely on the rate of underground drainage, the three principal fac-tors of which are porosity, the arrangement of layers having differentporosities, and the topography of the bedrock on which the water-bearing bed rests. The most porous beds, as, for example, the dunesands of the Connecticut River vaUey (PI. I, B), absorb water mostrapidly, but they also allow the water to circulate most freely andare therefore most rapidly drained. Impervious materials, such asclays (PI. II, B), occurring among porous deposits bear a relation tounderground drainage similar to that between dams or other obstruc-tions and surface drainage—they divert or impound the percolatingwaters and in many places produce springs and swamps. Exceptwhfere the drift is thick, the topography of the bedrock below the 1 Crosby, W. 0., Composition of till or bowlder clay: Boston Soc. Nat. Hist. Proc, vol. 25, p. 124,1890. U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 374 PLATE I. A. SECTION OF TILL, WINDHAM, CONN.
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