File:Ground water in the Hartford, Stamford, Salisbury, Willimantic and Saybrook areas, Connecticut (1916) (14760086426).jpg

Identifier: groundwaterinhar00greg (find matches)
Title: Ground water in the Hartford, Stamford, Salisbury, Willimantic and Saybrook areas, Connecticut
Year: 1916 (1910s)
Authors: Gregory, Herbert E. (Herbert Ernest), 1869-1952 Ellis, Arthur Jackson, 1885- joint author State Geological and Natural History Survey of Connecticut
Subjects: Water-supply
Publisher: Washington, Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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idenedby weathering and erosion.The widest fissures are sev-eral inches across; the nar-rowest are mere incipientcracks. They extend fromthe surface to depths of 300or 400 feet, and they gen-erally grow narrower fromthe surface downward. Thewater in the sandstone, beingderived chiefly from the driftat the surface, circulatesthrough the fissures and re-appears at the surface atlower elevations as springsissuing from the rock. Shale does not occur inConnecticut as uninterruptedbeds of wide extent, but inmany localities it formslenses in the sandstone. Ingeneral the shale is lessporous than the sandstone,and in many places it is en-tirely impervious. It is im-portant in intercepting anddirecting the circulation ofwater in the sandstone, andweUs sunk through sand-stone usually find water im-mediately above shale beds.Some of the sandv varietiesof shale are, however, moreporous than the sandstone,and aU the shale is traversed by fissures through which water cir-culates as in the sandstone.
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24 GROUND WATER IN THE HARTFORD AND OTHER AREAS, CONN. QUANTITY OF WATER. The quantity of water contained in the pores of the sand-stones and sandy shales is great, but owing to the minuteness of thepores the quantity recoverable by wells is small. This is illustratedby the well at the Hartford Sanatorium, which was drilled because owing to the altitude of the institution,city water was not available except bypumping. It was sunk to a depth of974 feet in an effort to obtain a yieldof 50 gallons a minute, the minimumamount required. The following tableshows the increase in yield as the wellwas sunk. (See fig. 7.) Yield of Hartford Sanatorium veil at several speci-fied depths. 100 200 300 400 <0<+- •- 500 .c Q.« Q 600 700 800 (900 1,1000 o Depth. Yield. Gallons Feet. per minute. 85 1 360 3 575 6 650 8 872 12 974 12 0 5 10 15 20 Yield, gallons per minute Figure 7.—Diagram illustrating increase ofyield with depth in well at Hartford Sana-torium. Log of Hartford Sanatorium well.

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