Otiii:r Usi;s of Cemicnt Pipe 



161 



6. .1 home industry: Another argument of considerable impor- 

 lance is that nearly all of the cost of metal culverts is sent away 

 from the county purchasing the culverts, while in the case of cement 

 pipe only the cost of the cement is sent away, while the balance of 

 the cost is paid locally for labor, sand, and gravel, and a home in- 

 dustry is encouraged. 



DRAK\ TILE 



Drainage is coming to be known as concomitant to irrigation. 

 Due to the downward percolation of water from irrigation conduits 

 and from irrigated fields, the water table rises over large areas, and 

 valuable cultivated lands become water-logged, and in some cases 



IT 



* .■ ■ * • 



. ■ # • . 



t / i 



l_^IO 0a/. Iron Jit/m.j 

 J*.T i-o Concrt,y'€. 



PLAN 



Detail for. Slid a. Notch 



Q 



^/a tSa/. Iron S/iJt <Stfii 



t 



Ot*-- 



iiviiiiiia' 



SE.CTlOn 



Fe.OIiT E.LE.V'ATIOli 



Fig. 37. — Common type of ffate in canal bank at head of lateral. 



alkalied. Two drainage districts, one near Tempe and one near 

 Thatcher, organized under state laws are now engaged in reclaim- 

 ing areas which had become alkalied, and in preventing the exten- 

 sion of the injury to adjacent lands. The Reclamation Service is 

 carrying out a drainage scheme for the whole Yuma Valley. Other 

 sections of the Salt River Valley are facing the same problem. 



