GATE STRUCTURES FOR IRRIGATION CANALS. 



53 



The concrete and iron work is complete while the anchor-bolt to 

 hold the wood foot plank, just back of the flashboard slots, is shown 

 on top of the pier wall. The canal below the structure is lined for 

 a short distance, sloping rapidly on the bottom to form a water 

 cushion. A shallow cut-off wall extends vertically downward at the 

 end of the lining to prevent undercutting of the eddying water. 

 Sufficient cut-off should be provided under the flashboard sill and 

 across the front of the turnout gate to prevent percolation and fail- 

 ure due to the hydraulic head developed when water is checked up. 

 As shown the delivery gate is vertical. A more economical con- 















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Fig. 16. — Combined check and delivery structure of Beaver Water & Irrigation Co., 



Colorado. 



struction would be to use the 45° connection as manufactured and 

 slope the gate to conform to the 1 to 1 slope of the lining below 

 the check. This would remove the recess, in which silt will gather 

 when the delivery gate is closed. 



COMBINED CHECK AND DELIVERY GATE, BEAVER WATER & IRRIGATION CO., 



COLORADO. 



A very economical, neat, and effective structure is used for the 

 deliveries from small, open ditch channels of this company (fig. 16). 



