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Show povX One Sei Cons V e (By E. B. Ti Letters con partment of ir the agricultural thing like thl, a pumping plant oi to raise the water t. want enough water to s. acres of land. What sizV I order and what horse po will be necessary to do tLc This brings up lminedlate questions, the duty of water andsf" the efficiency of the pumping plant. It may be safely seated that one sec-en" sec-en" foot of water delivered from a pumping plant will be ample to irrigate irri-gate eighty acres of ordinary Colorado Colo-rado land and will furnish ample 'supply 'sup-ply of water to raise ordinary farm crops upon It. In fact, we should do better than this and should make one second foot of water irrigate and take care of the crops on from 100 to 120 acres of our land. California farmers make one second foot of water irrigate irri-gate from 300 to 500 acres and in time we will do the same, but much money must be spent upon our canals and laterals before this can be done. So for an ample supply, let us say that one second foot will irrigate 80 acres. One second foot of water equals 450 gallons por minute, therefore a pump delivering 450 gallons per minute min-ute should be purchased. When we ' com? to figure horse power necessar to raise this amount of water twe feet high, We go back to the rV we Btudied when we were 'f yoV will think back over thosel I think you will remembera one pound is rajed o"J one "foot-pounds- done; if that J high, 20 for-done. for-done. A J from 1,4'' ficienya ay and Jrw cf iiaTe a unit t5s ri Aiv which is called "hV. f and it is equal to foot-FV .per second. Our engintV are afrated in horse power. Wherl oneCubic foot of water, or 450 gallons, Jdelivered each second the weight of this water is 62 pounds. "If this is raised 20 feet high, we would be doing 20 times, 62 or 1,250 foot-pounds of work each second. Dividing this by 550, we have 2.3 (nearly). This is the theoretical horsepower required to raise one second foot of water twenty feet high. Our machinery, however, is not perfect for there is work lost in friction, friction of the water in the pipe and also in the turns and elbows, hence it will take more than a 2.3 horsepower engine to do the work desired. de-sired. The efficiency of an ordinary plant will not usually run more than ' 50 per cent, perhaps 40 per cent would be a better figure, so the 2.3 horsepower horse-power represents just 40 per centof the power necessary, or the sized engine en-gine to order would be 100 times one-fortieth one-fortieth of 2.3, which Is practically six horsepower. |