39© IRRIGATION FARMING. 



A five-inch pump geared to run forty-eight eight- 

 inch strokes a minute will discharge i,86o gallons of 

 water an hour; a six-inch pump geared in the same way 

 will discharge 2,760 gallons an hour, and an eight-inch 

 pump will discharge 4,860 gallons an hour. A reser- 

 voir one hundred feet square by four feet will contain 

 40,000 cubic feet, or about 300,000 gallons of water. 

 A five-inch pump discharging 1,860 gallons an hour 

 will in one-third of a day, or eight hours, discharge 

 14,880 gallons. In twenty days of eight hours each — 

 this is assuming that the windmill runs one-third of 

 the time — 297,600 gallons of water will be secured, 

 pracflically filling the 300,000 gallon reservoir. Dur- 

 ing the six months from April to September, inclusive, 

 there are nine periods of twenty days each. There- 

 fore, the reservoir can be emptied and refilled nine 

 times during the six months, resulting in an aggregate 

 of 2,700,000 gallons of water for irrigation purposes, 

 equal to 360,000 cubic feet. This is sufficient water- 

 supply to irrigate ten or eleven acres of ordinary soil 

 nine times during the season, which would be the 

 maximum number of wettings. A steam-pumping 

 plant with a fifty horse-power engine will raise 

 7,500,000 gallons of water to a hight of ten feet every 

 ten hours. This amount of water will cover twenty- 

 three acres to the depth of a foot in the period men- 

 tioned. The cost of the plant will approximate $3,000. 

 It will require one man to operate it, and about one 

 ton of coal daily to keep it in operation. In many 

 places wood is so abundant and cheap that coal is not 

 needed to be used, while in numerous localities straw 

 or cobs may be burned, thereby reducing the cost of 



