24 



laterals being" left to the discretion of the ditch walker or to the irri- 

 o-ators themselves. 



On the gmaller ditches taking- water from the river, wliere only a 

 few parties are interested, no measured division of the ditches' supply 

 is made, each person taking an amount proportionate to his needs. 



METHODS OF IRRIGATION. 



The methods of applving water to crops irrigated from the West 

 Gallatin are in every way similar to those employed in otlier sections 

 of the Stat(^ and are described in another part of this report. (See 

 pp. i8-56.) 



FLOW OF RIVER AND CANALS. 



Durhig the season of 1902, along with other tield observ^ations made 

 in the Gallatin Basin, a series of measurements was made of all the 

 canals and ditches taking water from the West Gallatin. One set of 

 measurements was made during the middle of June at a time when a 

 majority of the canals were diverting their greatest volume. This 

 measurement was made some three or four weeks after the irrigation 

 season had opened. A second set of measurements was made about 

 the middle of July, and a third set of measurements was made about 

 the middle of August. This last measurement represents the flow at 

 the termination of the irrigation })eriod. In the two tables which 

 follow are given the results of these three sets of measurements. 

 Those in the first ta))le give the discharge of the canals on the east 

 side of the river in the order in which they head on the river. The 

 second table gives in a similar order the discharge of all canals on the 

 west side of the river. 



As the statute inch is used extensively in Montana in the statement 

 of stream discharges, the values in the following tables have been 

 expressed both in cubic feet per second and in Montana inches. 40 of 

 which are equivalent to 1 cubic foot per second. 



