Fish Ladder: Water Must Allow Fish to Ascend

A drop structure that allows fish to pass through. The original fixed-bed weir or small river weir has been transformed into a series of stone-paved steps and small pools. Each step has a height difference of only ten to fifteen centimeters, and there are gaps between the pools for water to flow through at a gentle speed. The stones are arranged irregularly, creating areas of different flow velocities so that fish of various sizes can rest and move forward. Water forms continuous small cascades over them.
Avoid: Using vertical drops and concrete weirs, making the steps into regular, equally high geometric shapes, making the height difference of each step exceed twenty centimeters, using pipes instead of open waterways.

Translated from Chinese by AI.

一段可以讓魚通過的落差。原本的固床工或小攔河堰被改成一連串的石砌階梯與小水池,每一階的高差只有十到十五公分,池與池之間有缺口讓水以緩和的速度流過;石頭的排列不規則,形成不同流速的區域讓不同體型的魚都能休息與前進。水在上面形成連續的小跌水。避免:使用垂直的落差與混凝土跌水、把階梯做成規則等高的幾何形、讓每一階的高差超過二十公分、用管道取代開放的水路。