Walking along the beach at Tofino, you see some interesting patterns in the sand.  He movement of water across the sand causes various ridges in the surface.  There is also water draining down the beach from the land behind the beach.  This water gathers behind the ridges but ultimately needs to drain further.  When it finds a weak spot, it cuts through the ridge.  Once it does so, the water all flows through this breach and it starts to take some sand with it.  It expands the cut and then deposits the sand further down as it slows down again.  This can result in some cool formations in the sand.