Chapter6 - Chapter 6 Water Resources Water The most...

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Chapter 6 Water Resources Water The most important resource supplied by Earth systems Human bodies about 70% water (by weight) Renewable resource – constantly cycles through the environment Quality and quantity of water will become increasing concern over the next half century – in many parts of the world, it is the primary resource issue The Hydrologic Cycle “What goes up…must come down” 97% of Earth’s water is in oceans 86% of all evaporation comes from the ocean 14% comes from land (including water absorbed by plant roots and passed through their leaves transpiration ) 66% falls back into ocean as precipitation 86% of all evaporation comes from the ocean 66% falls back into ocean as precipitation 20% moves over land via advection processes 14% comes from land 12% flows to ocean areas via advection Combines with the 66% from ocean to form precipitation 2% (of the 14%) joins up with the 20% from the ocean and results in precipitation over land 20% of evaporation from ocean reaches land through advection Only 12% of evaporation from land reaches ocean from advection Remaining 8% is from surface water and groundwater runoff. Soil-Water-Budget Concept Total precipitation input vs. total water output Precipitation = earnings Evaporation, transpiration & runoff = expenditures Soil moisture storage = savings account The Soil-Water Balance Equation Terms and concepts… Precipitation (PRECIP): supply of moisture to Earth’s surface Rain, snow, hail, sleet Dew and fog are also inputs Actual Evapotranspiration (ACTET) Evaporation Transpiration: outward movement of water through stomata in underside of leaves Evaporation and transpiration are outputs Æ evapotranspiration
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14% comes from land & plants PRECIP vs. POTET Water Deficit POTET met through PRECIP, soil moisture or irrigation (artificial)
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This note was uploaded on 04/20/2008 for the course GEOS 200 taught by Professor Hanchette during the Spring '08 term at University of Louisville.

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Chapter6 - Chapter 6 Water Resources Water The most...

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