GROUND WATER IN NORTH-CENTRAL TENNESSEE
GROUND WATER IN NORTH-CENTRAL TENNESSEE
GROUND WATER IN NORTH-CENTRAL TENNESSEE
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COUNTT<br />
trated calcium bicarbonate water in beds from 30 to about 75 feet<br />
below the surface and those which find more highly mineralized<br />
waters containing sulphate, with or without hydrogen sulphide,<br />
generally in beds between 100 and 135 feet below the surface. How<br />
ever, some wells more than 100 feet deep yield calcium bicarbonate<br />
water of satisfactory quality, and some others less than 5Q feet deep<br />
yield water that is much too highly concentrated to be fit for any<br />
ordinary use. Analyses 365, 370, 376, and 390 (pp. 116-117) are<br />
typical. Highly mineralized water that is unfit for most uses is found<br />
in a relatively large proportion of the wells drilled in the Lowville and<br />
Lebanon limestones on the upper reaches of the Harpeth and West<br />
Harpeth Rivers. (See pi. 4.) Furthermore, adjacent wells may differ<br />
greatly in depth to water-bearing beds and in the chemical character<br />
of the water, and not all wells are successful, None have a reported<br />
tested capacity exceeding 20 gallons a minute, and the ultimate capac<br />
ity of several is less than 1 gallon a minute. The water-bearing<br />
properties of the deeply buried rocks are not known but may be in<br />
ferred to be similar to those disclosed by well 403, which is in Maury<br />
County about 5 miles south of Allisona. This well on August 17, 1927,<br />
was 870 feet deep. Beds ca>rrying potable water were penetrated at<br />
25 and 60 feet below the surface, but the underlying strata were devoid<br />
of water to a depth of 855 feet, where a very small amount of concen<br />
trated brine was found at the contact (unconformable?) between two<br />
beds of limestone. Hence deep drilling for water in the east half of<br />
the county is not likely to be successful. Furthermore, no rocks of<br />
large water-yielding capacity are known to occur here at any depth.<br />
It is reported that well 365 discharges by artesian pressure during<br />
the winter from a solution crevice or unconformity 160 feet below<br />
the surface. Presumably the artesian condition is local and due to<br />
trapping of ground water above an obstruction in a solution channel<br />
or in a discontinuous cavernous zone associated with an<br />
unconformity.<br />
QROTJND-<strong>WATER</strong> SUPPLIES<br />
FranMin. The city of Franklin derives its municipal water supply front* 36<br />
springs along the eastern base of Duck Rive? Bidge, froin 9 to 13 miles west and<br />
southwest of the city (Nos. 3f>6, 379 to 385). The estimated minimum annual<br />
discharge of these springs, as reported to the city officials by B. H. JOyee, con<br />
sulting engineer, of Nashville, is shown by the fallowing table.