306 IRRIGATION FARMING. 



Flume A structure or box for conducting water across de- 

 pressions or uneven places. 

 Fly-Off Evaporation of water as compared with run-off 



waters. 

 Fore Bay That part of a canal where the water enters the 



headgate. 

 Fountain-Head Original source ; a spring from which 



water flows. 



Grade The degree of inclination in a canal. 

 Grade Level An instrument for determining the slope of 



a water course. 



Gradient Rate of variation in the grade of a ditch. 

 Head The measure of stored up or gathered force ready to 



be used in irrigating ; the hight of a body of water in 



covering land, as by flooding. 

 Head Bay See fore bay. 

 Head Ditch A lateral running along the highest level of 



land to be irrigated. 



Headgate The up-stream gate of a canal ; a water or flood- 

 gate. 

 Hydraulic Engineer One skilled in hydraulics and the 



construction of water ways. 

 Hydraulic Ram An automatic device for raising water by 



its own power. 

 Hydraulics The science of liquids, especially of water in. 



motion. 



Hydrometric Sluice A certain kind of measuring box. 

 Intake The point in a stream where a canal is taken out. 

 Inundation Overflowing or covering land with water. 

 Irrigaiit An irrigating ditch. 

 Irrigation The process of watering agricultural lands by 



artificial means. 



Irrigator A cart for watering crops ; one who irrigates. 

 Lateral A side ditch ; the small service line leading from a. 



supply ditch or canal. 

 Levee A border or embankment. 

 LIH-S.S A deposit of fine clay loam or very fine sand ; th- 



-dimeiit found in canaU 



