Report On the Filtration of River Waters for the Supply of Cities As Practised

Cover Report On the Filtration of River Waters for the Supply of Cities As Practised
Report On the Filtration of River Waters for the Supply of Cities As Practised
James Pugh Kirkwood
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Two new filter beds have just been added (August, 1868), one only of THE NEW RIVER WATER WORKS. 65 which is in use ; these are'marked No. 6 and No. 7 on the sketch. The walls of these last have been built vertical, and therefore the sand area corresponds with the water area.
They measure each 300 by 140, very nearly, or about one acre each.
The materials of the filters were stated to be as follows : Fine sand, originally 24 inches.
(This sand is allowed to be reduced to 12 inches before being r
...enewed. ) Coarse sand 12 Pea shingle 12 Shingle, marble size, and gravel 12 60 inches.
When the filter bed is bare, there is seen a cast-iron semicircular drain 30-inch diameter, extending from the river bank to about one-fifth the length of the filter bed on its centre line. The lips of this half-pipe correspond with the surface of the sand of the filter.
When the filter bed, after being cleaned off, has to be refilled, the New River water (controlled by . A sluice in the brick semicircular well shown on the sketch) passes into this half-pipe, and flows over either side of it upon the sand, slowly covering it with unfiltered water.


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