AGRON / MTEOR 404 Global Change. Changes to Water Resources Raymond Arritt Department of Agronomy. Effects of water resources. erosion Timing in crop growth cycle Runoff – wastewater treatment, pollution Groundwater depletion, subsidence Distribution of rainfall, shifting patterns
Changes to Water Resources
Department of Agronomy
Precipitation – Evaporation = Runoff + D Storage
storage includes lots of things:
soil moisture, aquifers, reservoirs, withdrawals for irrigation, glaciers, snowpack, etc.
2041-2060 compared to 1900-1970
Where do we see increases in runoff?
Where do we see decreases?
(IPCC A2 scenario)
results from two different climate models
reduced water stress in tropical regions
increased water stress outside the tropics
A deficiency of precipitation over an extended period that causes water shortage for some group or activity.