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Ch. 11 Water
Environmental Ecology- Water & Water Pollution
Term | Definition |
---|---|
Water Sources | 1. Ground Water 2. Surface Runoff- precipation that does not infiltrate down- watershed (drainage basin)- large geographical area of drainage. 2/3 of surface runoff is lost annually to things like floods. 1/3 is available for human use- 70% goes to irr. |
Increase Water Supplies | 1. Withdraw groundwater (aquifer) 2. Build dams & reserviors (artificial lakes) 3. Transporting of surface water for irrigation & diversions 4. Converting of salt water to freshwater through a process called desalinization |
Desalinization | 1. High cost- passed on to consumer 2. Kills marine organisms 3. Large quants of salt- "brine" |
Flood Plane | Flat land area that is adjacent to rivers & streams that is subject to annual flooding |
Advantages of Flooding/Flood Plane | 1. Provide natural flood/erosion control 2. Can provide high water quality-rain 3. Serve as recharge of ground water levels/wetlands 4. Fertil soil- farming 5. Water for irrigation-crops 6. Areas that provide ease for construction |
Disadvantages of Flood Plane | !. Causes more $ damage, property damage, & human lives annually- more than any other natural disaster combined |
Types of Water Pollution | 1. Infectious Agens (pathogens) 2. Oxygen demanding wastes 3. Plant Nutrients 4. Organic Chemicals 5. Inorganic Chemicals 6. Sediments 7. Heavy Metals 8. Thermal Pollution |
Infectious agents | (pathogens) bateria, viruses, parasites Effects: disease spread- vectors |
Oxygen Demanding Wastes | (organic waste) Effects: Biological oxygen demand (BOD) |
Plant Nutrients | Nitrates & Phosphats for plant growth Effect: Eutrophication- process which you get scum (algae) |
Organic Chemicals | From refined fossil fuels (gas, oil, pesticides, and fertilizers) Effect: Poisoning |
Inorganic Chemicals | Acids (<7), Bases (>7),metallic compounds Effect: poisoning |
Sediments | Sil, silt from erosion & runoff Effect: disrupts egg cycles, reduces photosynthesis |
Heavy Metals | Lead (Pb), Mercury (Hg) Effect: Neurological damage- build up in organs- liver |
Thermal Pollution | Heat damage from industrial plants Effects: Kills fish, damages food chain, spread diseases |
Stream | Flow out |
Lakes/Reserviors | Stratified thermal layer- very littler vertical mixing & little horzontal flow/mixing |
Groundwater Pollution | Aquifer, very little lateral flow (approx. 1ft/day)low dissolved oxygen Decades ---> centuries to clean up |
Ocean Pollution | 80% of pollution is land based pollution most oil pollution; some industry chemicals 53% of U.S. Pop. lives on/near coasts |
Natural Ocean Pollution | Red tide- toxic red algae blooms in gulf due o excess natural nutrients- phophrus & nitrates Oxygen depletion zones- large algae blooms- reduces photosynthesis- low dissolved oxygen |
Man-made Ocean Pollution | Oil Pollution (1/2 land based, 1/2 crude oil spills- tankers/oil rigs 5,500) |
VOC's | volatile (fumes) organic compunds- can kills birds (cause them to lose feathers, feathers result in insulation) Biodegrades in 3 years Refined- 10-20 years |
Sewage Treatment | 1. Septic System- residential 2. Convential (municipal sewage treatment plants- suspended soilds & organic waste- 97% removed; toxic compunds/organic chemicals = 70% removal 3. Natural Sewage treatment- tanks, artifical marsh, aqurium tanks |
Water Treatment Process | (drinking) have a settling basin with aeration which produces DO, solids sink to bottom or broken down. The partially decomposed then goes to a water treatment plant where they use chemicals such as chlorine. |
1972 | Created the Clean Water Act, beginning of EPA 1. Increased construction of sewage treatment plants & water treatment plants 2. Stream quality increased (fish/swim) 3. Reduction of topsoil loss/erosion control 4. Reduced wetlands loss |