As the flow passes through the shaft, it impacts on the floor which may require special provision to protect the surface and prevent any erosion that may take place over a long period of time.
(the flow; passes; through the shaft) (any erosion; may take; place; T:over a long period of time) (it; impacts; on the floor) (the floor; may require; special provision to protect the surface and prevent any erosion)
the flow any erosion it the floor
passes may take impacts may require
through the shaft
place T:over a long period of time
on the floor
special provision to protect the surface and prevent any erosion