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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Scobey ' 
Pig. 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). 
