dangerous drop fall fast fierce kjosfossen natural nature norway norwegian pour powerful raging rocks spray thunderous violent water waterfall cliff channel control current dam depth electrical England english gate level lock manage management power powered regulate regulation river thames bend burn drain drainage dune dunes flow gentle grass highland marin perspective sand sandy scotland stream atmosphere background city cooling crossing damp downpour drenched drenching footpath gray grey heavy-rain outdoor outdoors path pedestrians pelting-down pouring-down pouring-rain rain raining roadside Singapore spatter spattering splatter stormy streaming street street-scene textures tropical umbrellas unprotected weather wet wind canada cascade conifer descend forest hillside plunge rock Rockies Rocky Mountains Tangle Falls tree waterfalls