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Farm Water Supply:
A widely used arrangement for farm water supply systems consists of a combination of a centrifugal Pump and a jet Pump as shown in Fig. 15. The centrifugal Pump furnishing the driving head and water to create the jet. Because of the entrainment principle more water flows up the vertical pipe than is delivered by the jet. Among the advantages of the centrifugal-jet Pump combination is the accessible location of the centrifugal Pump and motor on the ground surface and the fact that there are no moving parts in the well. Under favorable conditions the capacity of the centrifugal Pump is such that approximately 50 per cent of the total discharge is returned to supply the jet.Water Supply.—The way in which Rome is supplied with water has several distinctive aspects. No storage reservoirs are necessary since the source of supply is constant. Furthermore, each aqueduct bringing water to the city has separate sources and distribution. Fed by springs at the foothills of the Apennines, by percolation of water through the volcanic ash hills, and by some of the crater lakes, Rome's aqueducts supply all the city's fountains as well as its industrial and domestic needs.
When the distance to remote sources m construction too expensive for a single commui to finance, regional water-supply systems w set up. The earliest in the United States wa: 1895—the Metropolitan Water District of Ma; chusetts, serving Boston and suburban commt ties within 10 miles of the city. It origin; served 18 communities with a population be] 900,000 and now serves 30 communities wit population of 1,600,000. (Consult Hazen, Jc nal of the American Water Works Associati vol. 50, p. 1137, 1958.) Beginnings of Water Treatment.—Of mote antiquity is the appreciation of the relat of the drinking water supply to disease.
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