The Selection and Cost of a Small Pumping Plant (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Selection and Cost of a Small Pumping Plant

The source of water supply may be surface water, such as water occurring in rivers, lakes, canals, etc., or it may be ground water. Where surface water is available, the supply should be developed by means of a proper intake, which in the simplest cases will be formed by making the suction pipe of the pump extend into the body of water. Where ground water is available, wells are the most common means of development.

N o attempt is made in this bulletin to discuss the conditions under which ground water occurs, or the extent and permanence of the supply. It is an important fact that over a long period'of years no more water can be pumped from any body of ground water than is replaced from its source of supply. The source in any given case may be seepage from natural stream channels or from canals, percola tion from irrigated areas, or percolation from direct rainfall. The' conditions under which ground water is replenished, however, are frequently complex, and the measurement of the replenishment is difficult. That present rates of pumping are approaching or exceeding the rates of replenishment in some areas of the state is indicated by the lowering of the ground water elevation from year to year. There is as much need for investigation and care in studying the water supply for pumping purposes as there-is determining the adequacy of the water supply of a canal system diverting natural stream flow.

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