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Water Sustainablity

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Water Sustainablity

  1. 1. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. Water water everywhere? Precipitation • Onshore Most of the water on Transport Condensing Earth is saline Water Vapour Evapotranspiration Evaporation Evaporation • Only 2.6% of water on Snow and Ice the Earth is fresh Rivers Run off and Lakes Infiltration Oceans Ground water
  2. 2. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. Water water Where is the Planets fresh water? everywhere? Ice Cap and Glaciers 69% • But only a small part of this is available to man • Most fresh water is locked up in polar ice and mountain glaciers Lakes and Rivers 0.3% Ground water 30% • Of the rest not all of that is easily accessible
  3. 3. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. What do we use water for? Available water in the hydrological Precipitation cycle has to provide all of humanities Onshore Transport Condensing needs Water Vapour Evapotranspiration Evaporation Evaporation • Drinking Snow and Ice Rivers Run off • and Lakes Industry • Infiltration Irrigation Ground water Oceans • Recreation
  4. 4. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. Where does our water come from? Precipitaion Evaporation Evaporation Run-off and rivers Extraction Ground water flow Lakes and Resevoirs Aquitard Infiltration Wells and pumps Sediment Aquifer Aquitard Bedrock Aquifer
  5. 5. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. Water supply and contamination • Humanity though is also very apt at damaging the water cycle
  6. 6. Topic 3: Human population, carrying capacity and resource use 3.6.1 Describe the Earth’s water budget. Exchange area between ground water and river Water supply and contamination Recharge of bedrock and sediment aquifers Recharge of surface aquifers Surface streams at fault lines Aquitard Well Bedrock aquifers Contamination Aquifer in sand and gravel
  7. 7. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea • The fourth largest lake in the world
  8. 8. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea • The last 40 years
  9. 9. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea • The last 40 years
  10. 10. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea
  11. 11. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea • In the 1930’s Canals were built to irrigate vast cotton fields • by 1960 between 25 and 50 km3 of river water diverted annually • Level dropped 20cm/yr for 10 years then in the 1970’s 60cm/yr and almost 100cm/yr in the 80’s • in 1990 the lake split in two
  12. 12. Topic 3: Human population, carrying capacity and resource use 3.6.2 Describe and evaluate the sustainability of a freshwater resource A case study: the Aral sea - and what now?

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