Diversion headworks are hydraulic structures that divert water from a river into a canal. They raise the water level in the river and regulate the water supply to the canal. The main types are temporary diversion structures like bunds, and permanent structures like weirs and barrages. Weirs are structures built across rivers at a right angle to divert water. Common weir types include masonry weirs with vertical walls, rockfill weirs with sloping surfaces, and concrete weirs with a downstream slope. Barrages have low crests and use gates to control water levels. Proper site selection and design are needed to prevent failures from subsurface seepage, uplift pressure, or surface scouring.