180
SOME ESSEX WELL-SECTIONS.
This section is in the part where, from uprise of the beds, the
London Clay has been eroded.
(47.) Strethall.—The Hall. 1892. Deepened 7 feet, 1894.
Made and communicated by Mr. G. Ingold.
Shaft throughout.
(1, S.W.) Thurrock, West.—Tunnel Cement Works. 1876.
Made and communicated by Messrs. Legrand & Sutcliff.
Water-level 10 feet down. ? Yield 220,000 gallons a day, of 10
hours, from 2 tube-wells.
Waltham Abbey.
The following is from a Memorandum as to artesian wells on the
property of the War Department, Waltham Abbey, by Major F.
Edmondes, R.E., February, 1886, and though no section of the
wells is given the particulars are of interest.
The water of the dwelling-houses of the officers and hands of the
factory is from a well at the back of the Gun-cotton Works. This
well was in existence when this part of the factory was acquired,
and its exact depth is not known. ? 100 feet, or more.
It has given a continual supply equal to requirements for the last
twenty-five years. After exceptional seasons of drought the supply
lessens. It is said that twenty years ago the delivery was 5 feet
above ground ; now it is only 11/2.
The well in Powder Mill Lane became silted up, and was rebored
ten or twelve years ago. It was cleared to a depth of 95 feet, and
the supply has since been continuous.
The water (? of both wells) flows into tanks at ground-level, and
from these is pumped into high-level tanks, for pressure.