238 



CANADIAN FARM YEAR BOOK. 



A Model Pumping Airmotor Outfit— For Domestic Use 



Showing Filtering Intake Chamljer. .Supply for House and .Stable, and also Lawn and Garden Supply, 

 the latter arranged so as to be »hut off in winter and pipes emptied. 



IVater for Irrigating. 



Units. 



The "Acre-Foot" is the unit for 

 measuring water used for irrigating 

 land and is the amount of water 

 which will cover one acre to a depth 

 of one foot. 



On this basis the unit is equivalent 

 to covering two acres with six inches 

 of water, or three acres with four 

 Inches, or twelve acres with one inch. 



An "Acre-Inch" is one-twelfth of 



an "Acre-Foot" or the quantity of 

 water that will cover one acre to a 

 depth of one inch. An "Acre-Foot" 

 is equivalent to 43,560 cubic feet and 

 an "Acre-Inch" to 3,630 cubic feet. 

 The flow of water is usually rated 

 in cubic feet per second, so that one 

 cubic foot per second will deliver two 

 acre feet in twenty-four hours, which 

 is equal to 450 gallons per minute. 



Irrigating Data from Government Tests 



Acres irrigated by different quantities of water, with allowance for evaporation; 

 basis 28,320 gallons of water to irrigate one acre one inch deep. 



Gallons Pumped 

 Per Minute 



600 



824 



944 



988 

 1000 

 1200 

 1500 

 2000 



Acres Irrigated in Ten Hours 



