324 



Irrigation and Drainage 



PUMPING WATER WITH ENGINES 



The amount of water which was pumped by a 16 -foot geared 

 windmill with a lift of 12.85 feet has been given as 79.1 acre- 

 feet as the work of a year. 



A 2/^ horse -power Webster gas engine was used on the same 

 pumps with which the windmill did most of its work, and with 

 the same lift, to see what amount of water could be supplied by 

 such a power. During a 6 -hours' run the engine lifted 13,202.2 

 cubic feet 12.85 feet high, with a consumption of 458 cubic feet 

 of gas costing $1.25 per thousand, or at a rate of 95.4 cents per 



day of 10 hours. 



At this rate of pumping and cost 

 for fuel, the engine could supply in 

 100 days 50.67 acres with 12 inches 

 of water at a cost for fuel of $95.40 

 or $1.88 per acre for the season, and 

 $3.76 where 24 acre -inches of water 

 is applied. 



On our own -place the same make 

 and size of engine as that used above, 

 and represented in Fig. 77, but using 

 gasoline at 9 cents per gallon for 

 fuel, and lifting the water against a 

 head of 50 feet with a double-acting 

 pump, discharging 75 gallons per 

 minute, the cost for a 96 -hours' run 

 (was $4.95. 



The water pumped in this time 

 was 432,000 gallons at the rate of 

 $1 for 3.214 acre-inches. In 100 

 days of 10 hours this plant would 

 lift, under its conditions, 601,605 cubic feet of water, or 13.81 

 acre-feet, at a cost for fuel of $51.56, thus making the experse 

 $3.73 for 12 inches in depth of water per acre, and $7.46 for 24 

 inches. 



Fig. 77. Webster 2% horse-power 

 vertical gasoline engine. 



