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II.—On some Recent Wells in Dorset
Published online by Cambridge University Press: 01 May 2009
Extract
For some years past the troops encamped at Bovington had to be content with such water as was supplied by a well a few hundred yards to the S.S.E. of the recently excavated borehole. The following particulars have been gathered respecting this well, but I cannot guarantee that in all respects they are strictly accurate. It was sunk in the Bagshot Beds about 1899, and is said to be 87 feet deep; the water-level stands at 82 feet from the surface, and the yield is 360 gallons per hour. The same Bagshot water-level was struck in the borehole. On comparing these two water-levels it is found that the one in the borehole stands at 85 feet above Ordnance Datum, whilst that in the well stands at 73 feet above O.D. This difference of 12 feet in a horizontal distance of 450 feet amounts to 1 in 37·5, showing a dip in the Bagshot Beds of 1½° to the S.S.E. This may not exactly represent the direction of maximum dip, but there are good reasons for believing that the line of maximum dip of the Bagshots hereabouts is not far from S.S.E.
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References
page 243 note 1 The engineers employed were MessrsLe Grand, & Sutcliff, . The operations lasted from 07 to 11, 1906.Google Scholar
page 244 note 1 The italics represent the descriptions of the foreman of the works.
page 248 note 1 For the particulars subjoined I am indebted to Mr. Alfred Pope and to Messrs. Le Grand & Sutcliff.
page 248 note 2 I have to thank Mr. Walter J. Fletcher, the County Surveyor, for much valuable information in connection with the Wimborne wells.
page 249 note 1 The horizontal section of the Bournemouth Waterworks at Wimborne is reproduced, by the kind permission of the Editor of Water and of Mr. Cripps, the engineer of the works. (See paper by MrCripps, in Water, 09, 1906.Google Scholar)
page 251 note 1 Baldwin-Wiseman, , On the “Motion of Sub-surface Water”: Quart. Journ. Geol. Soc., vol. lxii, p. 98Google Scholar. A sketch-map of sub-surface water-levels in the Chalk of Dorset, Wiltshire, and Hampshire is appended to this paper.