Falling jets

In this part of the calculation rule the erosion process cause by descending and horizontal in-flowing jets is handled. Some simple equations are presented that calculate the maximum erosion depth. The figures below show a number of erosion situations associated with various hydraulic structures.

Usually a current/jet picks up particles from the bed/bottom and transports them downstream of the impact area. The impact area is transformed into an energy dissipater, as a result of which an erosion hollow is formed.