242 



Irrigation and Drainage 



The Method of Time Division 



Where the amount of water carried in a ditch, lateral or 

 pipe is not so large but that an individual may use the whole 

 of it to advantage, the usual and the simplest method of divid- 

 ing the water is on the basis of time, allowing each user to 

 have the whole stream a specified number of hours and minutes, 

 making the length of the time proportional to the amount of 

 water to which each user is entitled. 



With this method, it is customary to issue to the various 

 users under the ditch, at the beginning of the irrigation season, 

 printed schedules or tickets, covering the whole or a portion of 

 the season, which specify the dates upon which they will be 

 entitled to the use of water, and the length of time they can 

 have it, as illustrated by the following ticket: 



WATER TICKET NO-s^lT. _____ 

 | DISTRICT' NO-/- 



Sprmgville. \ktf)... 



AA3fcjfA-i^^ 



DITCH NO.& 



lpd to discontinue its oss and turn It off youv 

 WHUTBFj BIRD. Wstl-no 

 -. Deputy. 



With this system, if one man is entitled to two, three or 

 four times the amount of water that a neighbor is entitled to, 

 the length of his period is two, three or four times as long: 

 and, as shown by the ticket, a regular rotation is followed, the 

 water returning to the same user after the same number of 

 days. 



Where the water must be used day and night, as should be 

 the case where water is scarce and is allowed to run continuously 

 to reduce waste, in order to prevent the night use of water fall- 

 ing always upon the same individuals, the rotation period may 



