What is fish ladder?

Our  Youtube Channel:-Specialised Civil

                                    FISH -LADDER

Large rivers are generally inhabited by several types of fish , many of which are migratory, called Anadromous fish, move from one part of the river to another part, according to the season.

Generally speaking for India, these Anadromous fish have found to be moving from upstream (hills) to downstream (plans) at the beginning of winter season in search of warmer waters, and return to their spawning grounds upstream, slightly before monsoons, in the month of May to June. This movement is essential for their survival . Due to the construction of weir or barrage, this movement gets obstructed and is detrimental to the fishes.

A structure that enables the fish to pass upstream is called a ‘Fish – Ladder ‘.For the free movement of fishes along the course of the river, the fish ladder is essential. It this fish ladder, the baffle walls are constructed in a zig-zag manner so that the velocity of flow within the ladder does not exceed 3 m/sec.

Also Read:-https://totalcivilstudy.blogspot.com/2018/06/one-example-analysis-of-rate.html

 

Tilpara Barrage

Also Read:-https://totalcivilstudy.blogspot.com/2018/04/some-rules-for-building-estimate.html