AUTOMATED WATER SPILLWAY DEVICE FROM CONTOUR-DITCH Russian patent published in 2007 - IPC E02B13/02 G05D9/00 

FIELD: hydraulic engineering, particularly devices to maintain predetermined water level in contour-ditches of rice irrigation system.

SUBSTANCE: water spillway device adapted to discharge water from upper pool of contour-ditch comprises partition with delivery outlet to be closed with inclined gate arranged from lower pool side and supported by horizontal pivot pin, control chamber and elastic sealed vessel located in control chamber. Control chamber includes delivery pipe having inlet orifice provided with valve, which is connected with upper pool float through rod. Elastic sealed vessel comprises discharge orifice having diameter smaller than that of delivery pipe and acts on piston cooperating with gate through rod and hinge. The gate has side partitions and sealing means.

EFFECT: possibility to use natural atmospheric precipitations for irrigation purposes, prevention of crop losses due to increased accuracy of necessary water level maintenance in rice contour-ditches and provision of optimal rice irrigation regime along with decreased labor inputs.

1 dwg