Bandharas
The bandhara is a masonry diversion weir of small height and the object is to raise water level in the stream. A small barrier or a wall of small height is constructed across the river or stream to raise water on U/S side.
Check Dams
The purpose of check dam is to retain water up stream, so that the water percolates into the ground and recharges the ground water table. As concern arises around large dams, check dams are proving their worth over and over. Check Dams built on seasonal rivers hurdles the wastage of rain water discharging into the sea and provides fresh water bodies for local use as well as strengthens the ecosystem. Check dams also serve to trap sediments and pollutants, fortifies local bio-diversity and helps in improving the overall quality of the water.
Barrage
A barrage is a type of low head, diversion dam which consists of a number of large gates that can be opened or closed to control the amount of water passing through. This allows the structure to regulate and stabilize river water elevation upstream for use in irrigation and other systems. It is used for purposes such as for Irrigation, water supply, etc.
Weirs
A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. They are also used to control the flow of water for outlets of lakes, ponds, and reservoirs.