26 



The values in the column headed *■' Mean flow for season '^ have been 

 derived from the measurements given in the other columns. The meas- 

 urements made in August, however, were given only one-half the 

 weight of those made in June and July. 



By cooperating with the representatives of the United States Geo- 

 logical Surve}^ a daily record of the flow of the West Gallatin at "Wil- 

 liams bridge for the months of the irrigation season was o])tained. 

 The flow of the river at this point in both cubic feet per second and 

 Montana miner's inches is given in the following table: 



DIxcliari/e of West Gdlhtthi Hirer at ]VI/liam.'< }>riil(jr, (Uilbilin ]'(ini'i/, Moiildint, 1902. 



Figure 4 shows the amount of water diverted from West (lallatin 

 River by all of the ditches and canals from June 10 to August 20, 1902, 

 and the discharge of the river during that time. In comi)aring the 

 amount diverted with the discharge in the river at Williams l)ridge, 

 it is found that there was enough for all purposes. It should be kept 

 in mind, however, that there was more than the average flow in this 

 river in 19()2, The discharge of the river from July 5 to August 20, 

 1900, was insufficient to furnish for all the ditches and canals the 

 volumes diverted in tlie summer of 1902, and the same condition pre- 

 vailed in 1901 from July 8 to August 20. 



