Report on the filtration of river waters; for the supply of cities, as practised in Europe, made to the Board of water commissioners of the city of St. Louis - Brossura

Kirkwood, James Pugh

Brossura

ISBN 10: 1130136728 ISBN 13: 9781130136722

Casa editrice: RareBooksClub.com, 2012

Riassunto

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. 1869 Excerpt: ...with the one or the other of these basins by a passage which can be sluiced off at discretion. The bottom of each filter bed, when not solid rock, is puddled with a layer of clay puddle two feet thick. The sides are sloped at 1 to 1, with 9-inch dry pitching. The materials of the filters are as follows: Sand 30 inches. Fine gravel, pea size 6 Coarse gravel, nut size 6 Broken stone, 3-inch ring 6" Clean quarry spauls, 5 to 8 inch 30 78 inches. The quarry spauls rest on the puddle. Resting on the puddle and imbedded in the layer of large stones last mentioned, are two dry stone drains (30x24 each) to collect the filtered water. These are united at one end, as shown in the sketch. Each filter bed measures 213x115 feet at top of its slopes. At the surface of the sand it measures 203x105. The sand area of each is therefore 21,315 square feet. The depth of water over the filter bed is limited to 24 inches. Six of these filters are supposed to be always serviceable, the seventh undergoing the process of cleansing. Although the amount of water used in the city now does not exceed six million gallons, the character of the Vartry water is so superior to that of the canal water in use now, that the consumption will in all probability reach nine millions shortly after the completion of the works. With six of the filter beds in use (127,890 square feet), and a consumption of nine million gallons per diem, the rate of filtration would be 70 gallons per square foot of sand surface per diem. With a consumption of twelve millions the rate would be 93 gallons per square foot per diem. The ample receiving reservoirs at Stillorgan will enable the filter beds to be operated continuously night and day. The large size of the collecting reservoir will insure great freedom fro...

Su questa edizione

• Editore: RareBooksClub.com
• Data di pubblicazione: 2012
• ISBN 10: 1130136728
• ISBN 13: 9781130136722
• Rilegatura: Copertina flessibile
• Numero di pagine: 80