IRRIGATIO]!^ IN NORTHERN COLORADO. 



55 



variation in this particular. Tlie general practice is to run water in 

 each furrow, but some farmers use every other furrow and altenate 

 for each irrigation the set used. Permanent head ditches are often 

 fitted with concrete or wooden checks to hold the water up to the 

 notches cut in the bank; otherwise canvas or metal dams are used. 

 Where head ditches are necessary in the middle of a field they are 





APRIL 

 10 20 



MAY 

 10 20 





JUNE 

 20 





JULY 

 20 



AUGUST 

 10 20 



SEPTEMBER 

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Fig. 7. 



-Irrigation of sugar beets. Water requirements of 584 acres in 1916 

 and 376 acres in 1917. 



plowed out in the usual manner and dragged with a " V "to smooth 

 and pack the sides. For turning the water from the head ditch to the 

 furrows a notch may be made for each furrow or the water from a 

 single cut may supply several furrows. 



Under small canals with good water rights, when the farmer 

 finishes his day of irrigating he goes to the head of his supply ditch 

 and cuts off the water there for the night. But under large canals 



