lo Feb., 1911] 



Irrigation. 



125 



manent check must be constructed as soon as convenient. Bag checks 

 should not be allowed to remain in the ditch after watering is completed^ 

 or the bags will soon decay. Either take them away and store them, or 

 hang them on a fence to dry. 



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Plan 



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i_~_~ir_rjrjra: 



CIevation 



T/inittof^ 



Section HB 

 55. TIMBER DROP RF.GULATOR. 



Another very serviceable check may be made with bags of earth ; small 

 bags such as sugar bags are the best, Inking easy to handle. Built across 

 the course of a ditch in the same way that bricks are laid, leavnig a water- 

 way at the top in the centre, they will be found good temporary appliances. 

 Except for the cost, permanent timi)er checks are much to be preferred. 

 Various kinds of masonry checks are the most permanent of all. but diey 

 are impo.ssible of removal. Iron may be used, but is expensive, and liable 

 with the l)est of coating to rapid decay. 



There are many designs f<ir making timber checks, but T fmd the above 

 (No. 55), which is in use in the ditch illustrated in sketch No. 51. answers 

 all purposes and is cheap. 



Red-gum timl)er is used on account ot its durability and freedom from 

 the attacks of white ants. It is gciurally received from tlie saw mills in 

 a green sappv condition, and when put together it should lie placed in 

 position at once and well coated witli hot tar. Even then the joints, and 



