Aquaculture Engineering (2+1)

Ponds - Classification based on source of water - Barrage ponds

Unit 2- Fish Farm

Ponds
Classification of ponds based on source of water

Barrage ponds

These ponds are usually filled by rainfall or by spring water. A spring sends the water flowing through a small valley or down a slope into a low place or a spring bubbles form the ground into a natural depression. The pond is formed by collecting water at the base of the valley and in the low places. The number of pond walls to be constructed depends upon the slope of the land and drainage system to be provided. Barrage ponds should not be built where the flow of water is too great; it is difficult to keep the water from breaking down the wall, if the pressure of water is too great. Even when the flow of water is not great, however, barrage ponds require over flow channels. Because barrage ponds are usually built in low areas they are likely to fill up with heavy rains. The over flow channels discharge the extra water away form the ponds. If this extra water is not taken out, the pond wall may break.

Advantage

• The cost of construction is less.

Disadvantages

• Difficulty to manage.
• Difficulty to control disease.
• Difficulty to prevent the entry of unwanted things.