Lakes and Rivers
Why don't rivers ever run out of water?
Asked in Lakes and Rivers, Oceans and Seas
Were does the water in streams and rivers come from?
Asked in Environmental Issues
In four years will the water run out?
Water will not run out, we may have shortages due to climate or use factors. In general we have as much water now as we have ever had. The water recycles through the water cycle and becomes new rain and snow to provide for our needs. In that regard the water will never run out. However areas of the Earth are subject to droughts (no rain or snow to feed rivers or groundwater) and the depletion of perched groundwater reservoirs (the removal of all water from a groundwater deposit). In this case the water can run out locally. As a further case, groundwater and rivers are replenished at a fixed rate. If people withdraw water faster than it is coming in the apparent effect is that the water is running out, but it is actually only being over used.