Water Resources All water Fresh water Readily accessible fresh water Oceans and saline lakes 97.4% Fresh water 2.6% Groundwater 0.592% Ice caps and glaciers 1.984% Lakes 0.007% Soil moisture 0.005% Biota 0.0001% Rivers 0.0001% Atmospheric water vapor 0.001% 0.014% Oceans Ice Lakes Soil moisture trillion gallons/person 240,000 gallons/perso
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Water Resources All waterFresh water Readily accessible fresh water Oceans and saline lakes 97.4% Fresh water 2.6% Groundwater 0.592% Ice caps and glaciers.
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Water ResourcesWater Resources
All water Fresh water Readily accessible fresh water
Oceans andsaline lakes97.4%
Fresh water2.6%
Groundwater0.592%
Ice capsand glaciers1.984%
Lakes0.007%
Soilmoisture0.005%
Biota0.0001%
Rivers0.0001%
Atmosphericwater vapor0.001%
0.014%
Oceans
Ice
Lakes
Soilmoisture
77 trillion gallons/person
240,000 gallons/person
Evaporation and transpiration
Evaporation
Stream
Infiltration
Water tableInfiltration
Unconfined aquifer
Confined aquifer
Lake
Well requiring a pump
Flowingartesian well
Runoff
Precipitation
ConfinedRecharge Area
Less permeable materialsuch as clay Confirming permeable rock layer
Watershed, water table, aquiferWatershed, water table, aquifer
Increasing Demand for WaterIncreasing Demand for Water
5,500
5,000
4,500
4,000
3,500
3,000
2,500
2,000
1,500
1,000
500
1900 1920 1940 1960 1980 2000
Wat
er u
se (
cub
ic k
ilom
eter
s p
er y
ear)
Total use
Agricultural use
Industrial use
Domestic use
Year
Use of Water ResourcesUse of Water Resources
In U.S., 2000 gallons/day/person In U.S., 2000 gallons/day/person