Water cycle
Videos
The water cycle is a biogeochemical cycle that involves the continuous change in form of water on, above and below the surface of the Earth across different reservoirs. The mass of water on Earth rema
Water cycle showing human influences and major pools (storages) and fluxes.
Relationship between impervious surfaces and surface runoff
Surface runoff
Videos
Surface runoff is the unconfined flow of water over the ground surface, in contrast to channel runoff. It occurs when excess rainwater, stormwater, meltwater, or other sources, can no longer sufficien
Runoff flowing into a stormwater drain
Surface runoff from a hillside after soil is saturated
Urban surface water runoff
Urban runoff flowing into a storm drain