The Global Hydrological Cycle Draw and describe the Global Hydrological Cycle. Explain how a balance is maintained within the Global Hydrological Cycle.

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Presentation transcript:

The Global Hydrological Cycle Draw and describe the Global Hydrological Cycle. Explain how a balance is maintained within the Global Hydrological Cycle.

Water as a finite resources 1.4 billion cubic kilometres of water within the planets hydrosphere. 3% is freshwater. 77.2% of this is in cold storage. 22.4% is in groundwater storage. 0.35% in lakes and swamps. 0.01% in rivers and streams.

Uneven distribution of water A small amount available for human use and consumption. Usually in the wrong place and the wrong time. From earliest times people have sought to harness and control the rivers.

Evaporation: The transfer of water from the sea to the air as water vapour. Condensation: Water vapour (gas) changes back into water (liquid). It forms small droplets which are visible as clouds. Precipitation: Water falls to earth as either liquid (rain) or in a frozen state (snow, hail). Stream / Surface Run Off: Most water returns to the sea in the form of rivers. Evapotranspiration: evaporation of moisture from vegetation Ground water Flow: Some water returns to the sea as groundwater through soil and rocks. Infiltration: The point at which rainfall seeps into soil. Percolation: The seepage of water downwards through rocks. Throughflow: The movement of water downwards through soil back to the sea. Groundwater Zone: Storage area for water which is slowly released back to the sea via springs and rivers. Interception – When precipitation is prevented from falling to the surface by leaves/dense forests. Hydrological Cycle