Velocity of flow in case of fish ladder is approximately

Explanation:

Fish Ladder:

A fish ladder is generally provided to enable the fish ascend the headwaters of the river and thus reach their spawning grounds for breeding or to follow their migratory habits in search of food. Fish ladders are generally located adjacent to the divide wall near the under sluices because there is always some water in the river section below them.

The general requirements of a fish ladder are :

• It has been established that most kinds of fish can travel u/s, against the flow of velocity of about 3 - 3.5 m/sec.
• Usually there is a head difference of 5 - 6 m between the U/S of the weir and D/S water level in the river
• The compartments of bays of the pass must be of such dimensions that the fish do not risk collision with the sides and upper end of each bay when ascending,
• Plenty of light should be admitted into the fishway,
• The water supply should be ample at all times, and
• The top and sides of a fishway should be above ordinary high water levels.