Proposed water supply and sewerage for Jerusalem : with description of its present state and former resources / by John Irwine Whitty.

  • Whitty, John Irwine, 1822-?
Date:
1863
Catalogue details

Licence: Public Domain Mark

Credit: Proposed water supply and sewerage for Jerusalem : with description of its present state and former resources / by John Irwine Whitty. Source: Wellcome Collection.

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    be more than counterbalanced by the power of bringing into action, by a given outlay, a greater expanse of country; the expense of the purchase of land, and of forming an artificial surface, being avoided, and, instead thereof, only the small cost of forming drains necessary. The collecting of water from a surface rendered im- pervious by artificial means need not be had recourse to, for I shall presently show, in Chap. V., Sec. 2, and the preceding pages, that, even though the population of Jerusalem should increase (as I am perfectly assured in my own mind it shall do) to many times its present numbers, without any extraordinary effort or expense, the district is capable of yielding five gaUons a-day of pure water to each individual in a population of up- wards of 3,200,000—about 400,000 more than that of London. It is by the application of a suitable arrangement of drains that surface water should, on a large scaler be collected. I have shown in Chap. I., Sec 4, that within the city walls, exclusive of streets and unoc- cupied ground, there is an extent of 796,921 square yards of impervious catchment surface, in roofs of buildings and yards, from which 38,872,762 cubic feet, or 242,259,71.9 gallons of pure water might be annually