Water Supply and Irrigation Papers of the United States Geological Survey . -bearing capacity, and wells have usually to besunk to a considerable depth before a supply is assured. Of nine wellsselected as typical, four are over 150 feet in depth (155, 171, 182, 210 76 GREGORY.] CONNECTICUT. 77 feet, respectively), and only one is less than 50 feet. When wells aresunk this deep the supply is plentiful and does not vary with theseasons. The water is hard, containing calcium, magnesium, andiron. The springs issuing from rock in the limestone area showabundant, constant flow and low temperature. I
Water Supply and Irrigation Papers of the United States Geological Survey . -bearing capacity, and wells have usually to besunk to a considerable depth before a supply is assured. Of nine wellsselected as typical, four are over 150 feet in depth (155, 171, 182, 210 76 GREGORY.] CONNECTICUT. 77 feet, respectively), and only one is less than 50 feet. When wells aresunk this deep the supply is plentiful and does not vary with theseasons. The water is hard, containing calcium, magnesium, andiron. The springs issuing from rock in the limestone area showabundant, constant flow and low temperature. In one case an invari-able temperature of 45 degrees is reported. Triassic sandstone area.—The bed rock of the Connecticut Valleylowland is sandstone with interbedded basalts and intruded sandstone varies in texture from coarse conglomerate to fine clayshales and is sufficiently porous to hold 20 to 30 per cent of its volumeof water. For this area it seems to be true that the deeper the wellthe more abundant the water suppty down to about 500 feet, and that. Fig. 17.—Areas of limestone, sandstone, and crystalline rock water supplies of Connecticut. there are no distinct water-bearing beds. Wells are all deep, averag-ing for the whole area over 100 feet. One well at New Haven wassunk to a depth of 4,000 feet by the Winchester Arms Company in anunsuccessful effort to obtain a flowing well. The conditions forartesian water are better in the Triassic rocks than elsewhere in Con-necticut, but are very unfavorable. While it is true that the sandstonescontain abundant water, yet their composition, texture, and positionare extremely irregular. They are not arranged in definite series, andthe}^ have been shattered by the forces which produced the faults inthe valley. There is, therefore, no continuity of stratification andno arrangement of water-bearing beds favorable for artesian practice among well drillers in Triassic rock is to sink the well 78 UNDERGROUND
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