Practical Specifications of Works Executed in Architecture, Civil and Mechanical Engineering [&C.]. - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865. Excerpt: ... send you the results obtained up to the present juncture, and to reserve, for a second report, the consideration of the construction of the well and reservoir, and the particulars of the pumps and of the mains for supply, as also the estimates. I am, &c, James Wylson. To IV.--Report on the Supply of Water to the Barnet Estate. By Joshua Prestwick, Jim., F.R.S.,'F.G.S. 20, Mark-lane, June 12, 1855. Sir, Agreeably to your request, I have considered the geological structure, and made some further slight examination, of the country around Barnet, with a view to determine the best course of water supply for the property of the National Freehold Land Society, adjoining the Barnet Railway Station. There are four sources of supply which have to be considered. 1st. That from shallow surface springs; 2nd. That from any neighbouring springs; 3rd. That from more distant streams or waterworks; and 4th. That from deep or Artesian wells. In the first case, the permeable surface beds of sands and gravel are of so limited extent, being confined chiefly to the tops of some of the adjacent hills, that they only suffice for the supply of the population located on those sites, and no other additional supply could be looked for from that source. In the second place, the streams are small; still, as they drain a clay surface of several square miles in extent, a not inconsiderable supply of water might probably be obtained by damming up the brook at the lower and most easterly part of the Company's estate at a point a little below where the two brooks meet. Apart, however, from other difficulties, the use of these brooks for drainage purposes might form a sufficient objection to this plan. The third plan is principally a question of cost in relation to the fourth plan. The New R...

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