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Water Resources - PowerPoint PPT Presentation


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Water Resources. Types of Water. 71% of Earth is covered in water Salt Water – 97% of the Earth’s water Fresh Water – 3% of the Earth’s Water 77% is frozen Surface water – lakes, rivers, streams, wetlands. River Systems. Tributary – start of system; usually in mountains

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Presentation Transcript
types of water
Types of Water
  • 71% of Earth is covered in water
  • Salt Water – 97% of the Earth’s water
  • Fresh Water – 3% of the Earth’s Water
    • 77% is frozen
    • Surface water – lakes, rivers, streams, wetlands
river systems
River Systems
  • Tributary – start of system; usually in mountains
  • Streams and creeks flow into rivers which flow into seas and oceans
  • Watershed – the area of land drained by a specific river
  • Watersheds are defined by land topography
groundwater
Groundwater
  • Water stored underground in sediment and rock formation
  • Water is filtered as it percolates through the ground
  • Watertable – point at which water saturates the soil and rock
  • Aquifer – underground formation of permeable rocks that allow the flow of water; usually made of gravel and/or limestone instead of clay or granite
    • Recharge zone - enviro. Sensitive area where water percolates into the aquifer
use of water
Use of Water
  • Residential
    • Treated to be potable
    • Sewage, well, and wastewater is treated
  • Industrial
    • Manufactoring
    • Power generation – cooling reservoirs
  • Agriculture
    • Largest use of freshwater worldwide
    • Irrigations
    • Natural waterways are often altered to meet agricultural need
water management projects
Water Management Projects
  • Diversion
  • Dams
  • Reseviors
  • Pros
    • Drinking water, recreation, hydroelectric power
  • Cons
    • Ecosystem disruption, displacing people, risk of dam failure
water conservation
Water Conservation
  • Agriculture
    • Drip irrigation
    • Time of irrigation
  • Home
    • Low flow toilets and shower heads, teeth brushing, showers, rainwater collection
    • Yard irrigatioon
  • Industry
    • Cooling towers rather than reservoirs; low flow
water alternatives
Water Alternatives
  • Fresh water is being used faster in some metropolitan areas than it can be treated
  • Desalinization
    • Salt water abundant
    • Expensive
  • Transport in from other areas
water pollution
Water Pollution
  • Point Source
    • Single location
    • Impact often great in one area
    • Can be regulated
  • Non-point Sources
    • Many different sources
    • Hard to control or regulate
  • Types of Pollution
    • Pathogens
    • Organic matter
    • Organic Chemicals – pesticides, fertilizers, plastics, detergents, petroleum
    • Inorganic Chemicals – acids, bases, salts
    • Heavy metals
    • Physical agents – heat and suspended particles