124 



Journal of Agriciiliitre, Victoria. 



\o Feb., 191T. 



S^- 



COVER FOR LEAKY 

 JOINT. 



especially where exposed to the sun, often open so much as to allow the 

 passage of a very material quantity of water. If this becomes excessive, 



cover the openings on the side bearing pres- 

 sure with narrow strips of tin or galvanized 

 iron, as shown in No. 56. If tin is not avail- 

 ;'!)le, use wood with strips of felt or sacking. 

 Scour of the sides of a ditch is often set 

 lijj iinmediately below a check or culvert, but 

 may be obviated by means of short basket 

 wings made from tree or vine prunings, or, preferably, by facing with 

 a few barrow loads of broken stone or bricks. 



In the case of long head ditches, where it may be desired to concentrate 

 water at some special place, timber regulators of the same design as the 

 drop shown on page 123, but omitting the step, mav be introduced. These 

 structures will serve as patterns from which larger or smaller ones may be 

 made, and when in doubt as to the strength of the timbers for larger 

 designs a hint may be had from the checks and bridges in existing channels 

 or reference made to the nearest shire engineer. 



(,"y~l"x. 2-'t« 



6 -j/j "X s'C 



mmm^^'M^:m^mmmMmM'^/i^^^M^m^Wimi(fi!/.^ 



6y/y2'j\ 



6.'t j > 5° 



9 X J' 6" X J- 6' X 3 '6- ><9'^ 



Longil-i sec'rion 



I'l >(\ 2- 6 ■ 1 





3 X 





i Ehr i 3et 



Plan 



57. REGULATING CULVERT. 



Crossings over ditches for the passage of waggons or implements may 

 be made with hollow logs or of red-gum or other timber to the design (No. 

 57); decking to be secured by 6-inch Ewbank spikes, driven in |-inch auger 

 holes, all timber to be treated with tar applied hot. It often happens that 

 a culvert is required to act as a regulator, m which case a light sliding door 

 may be fitted to the upstream end, wing-boards and cleats being nailed 

 to the ends of the deck and stringers for the purpose, as shown in the 

 drawing. There is no necessity to make the area of culvert equal to area 

 of waterway ; in most cases, it would involve too great expense for timber. 

 The design given will serve ordinary head ditch purposes, and it would 

 be well not to contract such crossings too much. 



Outlets from main channels for supplying water to irrigators are of 

 various design, and are usually supplied by the authority controlling the 

 main works. The number allotted is governed by the area and contour of 

 country operated, but an owner may insert more at his own cost, and 

 under supervision. \^'here meters are used, these outlets are expensive 



