Water Supply: the Present Practice of Sinking and Boring Wells: With Geological Considerations and Examples of Wells ExecutedSpon, Ernest
Science
Water Supply: the Present Practice of Sinking and Boring Wells: With Geological Considerations and Examples of Wells Executed
Spon, Ernest
Boring; Water-supply; Wells
_Ross_, Herefordshire.--The well at the Alton Court Brewery is shown in
Figs. 239, 240. The shaft, 5 feet in diameter and 27 feet deep, is
steined with 9-inch brickwork for a distance of 17 feet. At the bottom
is a 12-inch bore-hole 100 feet 9 inches deep, unlined. The water is
abundant. At level of the bore a heading, 6 feet high, 5 feet wide, and
27 long, has been driven, to afford storage room.
_Wolverhampton._--This town is partially supplied from wells sunk in the
new red sandstone. There are two shafts, 7 feet in diameter and 300 feet
deep, a heading 459 feet long, and in this a boring of 390 feet. The
yield when first completed was 211,000 gallons a day.
[Illustration: WELL AT SWANAGE, DORSET.
Fig. 241.]
[Illustration: PLAN.
Fig. 242.]
_St. Helens_, Lancashire.--Supplied with about 570,000 gallons daily
from two wells, each 210 feet deep, in the new red sandstone. Each well
has a bore-hole at the bottom.
OOLITIC STRATA.
_Northampton._--The well at the waterworks is sunk and bored 253 feet 3
inches in the lias. The shaft is steined with brickwork and iron
cylinders in the following order: for 16 feet 9 inches in depth the well
is 7 feet 6 inches in diameter, lined with brickwork; at this depth two
cast-iron cylinders 5 feet 6 inches diameter are introduced, which are
again succeeded by 9-inch brickwork, commencing at 5 feet 6 inches
internal diameter and widening out to 7 feet 6 inches in diameter. The
bottom of the shaft is floored with bricks at a distance of 120 feet
from surface. At this point the bore-hole commences, and for the first
31 feet it is lined with 14-inch pipes, which rise into the shaft 5
feet above the floor. The remaining portion of the bore-hole, 102 feet,
is 9 inches diameter.
_Swanage_, Dorset.--The section and plan, Figs. 241, 242, are of a well
at Swanage, sunk 60 feet and bored 53 feet, the lining tube rising 8
feet into the shaft, which is 5 feet 6 inches in diameter, and lined
with 9-inch steining. The strata passed through are clays and
limestones, and may perhaps be referred to the Purbeck beds. At first
this well yielded little or no water, but it now gives a sufficient
supply.
CRETACEOUS STRATA.
_Bishop Stortford._--The waterworks and well are situate west of the
town, near the farm buildings known as Marsh Barns. The shaft is 160
feet deep, the bore-hole 140 feet. The following is a section of the
strata;--
Feet.
BOULDER CLAY 17
LONDON CLAY, 54 feet;--
Brown Clay 14
Black Clay 2
Black Sandy Loam, with iron pyrites 12
Black Clay, with lignite 11
Dark Grey Sand, with large pieces of
sandstone and shells 15
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