. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SPRAY IRRIGATION. 11 can run tests up to a flow of 20 gallons per minute. Larger and deeper wells require special power equipment for testing. The boring of deep wells for artesian waters should be undertaken by an expert familiar with the local underground conditions. De-. termining in advance the probability of obtaining artesian water sufficient for irrigation purposes is a very diffi- cult problem. with the underground formations and hav- ing records of some deep wells in the vicinity upon which
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SPRAY IRRIGATION. 11 can run tests up to a flow of 20 gallons per minute. Larger and deeper wells require special power equipment for testing. The boring of deep wells for artesian waters should be undertaken by an expert familiar with the local underground conditions. De-. termining in advance the probability of obtaining artesian water sufficient for irrigation purposes is a very diffi- cult problem. with the underground formations and hav- ing records of some deep wells in the vicinity upon which to base their judg- ment often can render a fair opinion. However, it always is more or less a gamble until the well is completed, and a farmer should not take the risk unless he is prepared to lose. Deep wells are no more difficult to pump than shallow unless the water fails to rise to within suction lift of the surface. When it is necessary to sink a pit or a large casing deep into the earth to admit the installation of deep-well machinery, as is illustrated in figure 6, the cost is apt to be great and will be justified only where water can be obtained in sufficient amounts to irrigate a correspondingly large acreage. Unlike water for drinking purposes, water for irrigation need not be pure from a bacterial standpoint. It is therefore allowable to draw on both waters near the surface and artesian supplies in the same well (fig. 6) by having the casing perforated or slotted wherever a good water- ' .'0. ,».-<1,' Fig. 5.—Typical installation of vertical-shaft centrifugal pump in pit with half-turn belt. Pump in this case is sub- merged in water. 1, Engine ; 2, engine foundation; 3, fuel tank; 4, belt; 5, vertical shaft and bearings ; 6, water- cooling pipe for engine ; 7, dis- charge pipe ; 8, pump ; 9, suc- tion pipe; 10, well casing; 11, well Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil
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