What is the cost of installing a fish ladder in Wier?

Especially in France – to allow migration of species such as salmon swim upstream. Is it very expensive or difficult to do?

Costs vary depending on the slope of the canal, the dam height, the current width (if you want to divide the channel), the parameters of the water velocity, step height, and materials to use. The design is more likely a fall of stone where you can swim, which is several layers of irregularly shaped rocks placed downstream of the dam to create multiple pathways fish can not make their way through the rocks. At bottom, sand, clay and stone are filled with stones to force water to flow on the rock instead of through them. With the dams, the most common method is to replace a single dam with many small dams that have water jumping from a height less than adequate and depth and speed on a wide range of flows. This is something very easy and inexpensive to do with rocks and a bulldozer. The most expensive part of this approach is the engineering and study to ensure that the heights and distances were designed properly. Instead of rocks, concrete can also be used, but the designs are generally much more expensive concrete and much more likely to malfunction. Another method is to add a staircase to an existing landfill. This approach tends to be frequent maintenance to remove the glue and debris that get caught in escalators and stairways are generally less effective than building a series of low dams height. However, steps can build a very low cost for welding sheets of aluminum to form a stunned that can be screwed through the dam. Here are some references you can download:

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