SPRAY IRRIGATION. 



33 



(nearest railroad station), accompanied by lull descriptions of items it is 

 proposed to furnish, stating guaranties, efficiencies, and making recommend ;i- 

 lions on the size and items of construction for suction and discharge pipes to 

 be used. 



The source of water supply is (well, creek, etc.). 



The capacity of the water supply is gallons per minute. 



The foundations for pump and engine are to be of (concrete, 



brick, wood) set in (clay, loam, sand, rock) type of soil. 



The vertical distance of water below proposed pump foundation is feet. 



The vertical distance water will draw down when pump is running is 



feet. 



The horizontal distance of water from proposed pump is 



The vertical distance of proposed pump foundation from highest land to be 

 irrigated is 



The horizontal distance of proposed pump from the most distant irrigation 

 unit is 



The suction of pump must be (vertical or horizontal). 



The discharge of pump must be (vertical or horizontal). 



The number of bends in suction pipe must be of 



(90 or 45) degrees angle.- 



The number of bends in discharge pipe must be of 



(90 or 45) degrees. 



The amount of water desired per minute is . 



The desired pressure on nozzles for the highest ground is 



The height of nozzles above highest ground will be _. 



The type of pump preferred is (displacement, centrifugal), to be 



connected to power by (belt, gear, direct). 



The power desired for operating the pump is 



I now have a horsepower engine. 



The speed of my engine is revolutions per minute. 



The size of engine belt pulley is diameter, width. 



I can obtain alternating electric current of phase, 



cycles, voltage. 



I can obtain direct electric current of voltage. 



The following is a sketch of my water supply, showing the desired location 

 of pumping plant and field to be irrigated. 



SUCTION LIFT. 



It is advisable to set all pumps as close to the water as possible and 

 under ordinary conditions the suction lift should not exceed that 

 given in Table 5. Suction depends upon the atmospheric pressure, 

 which decreases as altitude increases. 



Table 5.— Practical suction lift of pumps at different altitudes. 



Altitude above sea level. 



Sea level 



J mile (1,320 feet). 

 *mile (2,640 feet). 

 J mile (3,960 feet). 



1 mile (5,280 feet)... 

 li miles (6,600 feet). 

 U miles (7,920 feet). 



2 miles (10,560 feet). 



Practi- 

 cal suc- 

 tion lift 

 of 



pumps. 1 



Feet. 



1 Practical suction lift of pumps is equal to the vertical distance water is lifted, plus the head due to 

 friction. 



