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Water use and pollution APES
Water use and pollution APES
41
Environmental Studies
12th Grade
03/09/2006

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Term
Rain shadown
Definition
Downwind side of the mountain which is ususally dry. The windward side causes orographic lifting & therefore cooling, followed by condensation & then precipitation.
Term
Residence time
Definition
The time that an individual molecule of water stays in a hydrologic compartment.
EX Ocean = 3000 years.
Term
Groundwater
Definition
Water held in the ground such as the aquifer.
Term
zone of aeration
Definition
Upper soil layers that hold both air & water.
Term
Zone of saturation
Definition
Lower soil layers or rock layers where all spaces are filled with water. The top of this zone is known as the water table.
Term
Aquifer
Definition
Porous layers of san, gravel, or rock lying below the water table.
Term
Recharge Zone
Definition
Area in which infiltration of water into the aquifer occurs.
Term
Discharge
Definition
The best measure of the volume of water carried by a river. It is the amount of water that passes a fixed point in a given amount of time.
Term
Renewable water supplies
Definition
Made up of surface runoff plus the infiltration into accessible freshwater aquifers.
Term
Withdrawl
Definition
Total amount of water taken from a lake, river, or aquifer for any purpose.
Term
Consumption
Definition
Fraction of withdrawn water that is lost in transmission, evaporation, absorption, chemial transformation, or otherwise made unavailable for other purposes as a result of human use.
Term
Degradation
Definition
A change in water quality due to contamination or pollution so that it is unsuitable for other desirable service.
Term
Use of water in MDC's or LDC's
Definition
Water use in order of most to least.
MDC: Industry, Agriculture, Domestic

LDC: Agriculture, Industry, Domestic
* If the country is water poor then most may be used in the domestic sector.
Term
Water stress
Definition
A country in which consumption of water exceeds more than 20 % of the available, renewable supply.
Term
Subsidence
Definition
Settling of the surface above an area that withdraws large amount of groundwater.
Term
Sinkholes
Definition
Form when the roof of an underground channel or cavern collapses, creating a large surface crater.
Term
Saltwater intrusion
Definition
Along coastlines in areas where overuse of freshwater reservoirs often allows saltwater to intrude in aquifers used for doestic & agricultural purposes.
Term
Desalination
Definition
A technology that might have great potential for increasing freshwater supplies by distillation or revese osmosis.
Term
Watershed
Definition
All the land drained by a stream or river. The Chesapeake Bay watershed contains land in 6 states (N.Y., Pennsylvania, Delaware, MD, VA, West Virginia) and Washington, D.C.
Term
Water pollution
Definition
Any physical, biological, or chemical change that adversely affects living organisms or makes water unsuitable for desired uses.
Term
Point source water pollution.
Definition
Water pollution that is discharged from a specific location. Factories, power plants, sewage treatment plants, underground coal mines, & oil wells are included.
Term
Nonpoint sources of water pollution
Definition
Scattered or diffuse sources that have no specific location where they discharge into a particular body of water.
Term
Atmospheric deposition
Definition
Air pollution that is carried & precipitated into watershed or directly onto surfaces waters.
Term
Infectious agents
Definition
Most serious water pollutant in terms of human health worldwide. Main source is from untreated sewage.
Water is tested for the presence of Coliform Bacteria (which is present in the human gut) but is itself not harmful.
Term
Oxygen-Demanding wastes
Definition
Organic wastes which use up DO when decomposed.
Term
BOD Biochemical Oxygen demand
Definition
A standard test of the amount of dissolved oxygen consumed by aquatic microorganisms over a 5 day period.
Term
Dissolved oxygen (DO)
Definition
Measured to asses the health of a water body.
Good = 5 or 6 ppm
Hypoxic less than 3 ppm
Anoxic = less than 2 ppm which will mainly suppor worms, bacteria, fungi, & other detritus feeder & decomposers.
Term
Cultural eutrophication
Definition
Increased nutrients flows brought about by humans causes "blooms" of algae followed by a decomposition of this algae which uses us DO in the water.
Term
Toxic tides
Definition
Increase in dinoflagellate populations. Usually associated with increase nutrients or lower water quality.
Term
Metals
Definition
Many metals such as mercury, lead, cadminum, & nickel are highly toxic in levels of ppm.
Famous case: Minimatta Japan where brain damage & birth defects resulted from mercury released into the ocean. People ate fish that had bioaccumulated the metal.
Term
Nonmetalic salts
Definition
Salts can be harmful in higher concentrations and are especially prevalent where irrigation in arid lands has left salts behind due to evaporation.
Term
Acids and bases
Definition
Realeased as a result of coal burning - acid rain or NOx from high temperature burning - nitric acid.
Acidic water leaches aluminum into the water which clogs fish gills. Also some fish & juveniles have narrow pH tollerances.
Term
Organic chemicals
Definition
Highly toxic in ppb or quadrillion (dioxin) are released by industries that make plastics, pesticides, pharmaceuticls & pigments. Many cause cancer, birth defects, genetic disorders & cancer.
Term
Sediment
Definition
Runoff of soil that blocks sunlight & clogs fish gills. Phosphorus (a nutrient responsible for eutrophication) bonds to soil particles.
Term
Thermal pollution
Definition
Water temperatures that cause harm to aquatic organisms. Comes from altering vegetation cover & runoff patterns or using the water for industrial cooling.
Term
TMDL (Total maximum daily loads)
Definition
State are required to to identify waters are not meeting water quality goals & to develop TMDL's for each pollutant & each listed water body. Both point and nonpoint sources are considered as well as seasonal variation. (Spring runoff from snow melt will increase fertilizer.)
Term
BPT (Best Practicable control teachnology)
Definition
For specific "point" sources of pollution such as industrial discharge pipes or sewage outfalls the Clean Water Act requires discharge permits & the best technology used to control it.
Term
BAT (Best available economically achievable technology)
Definition
National goals for toxic substances and zero dicharge for 126 priority toxic pollutants. Requires use of the BAT. Clean water act.
Term
Municipal sewage treatment
Definition
Primary treatment- 1st ste that physically separates large solids from the waste stream. Uses grating & settling tanks.

Secondary treatment- biological degredation of dissolved organic compounds.

Tertiary treatment - uses bacteria or chemicals to remove excess nitrogen or phosphorus.
Term
Effluent sewerage
Definition
A hybrid between tradition septic tank & full sewersystem. A tank collects & digests solid waste just like a septic system but the liquids are pumped to a central treatment plant. This is used when the area does not have enough area for a drainfield.
Term
Bioremediation
Definition
Using living things to breakdown wastes. Can be done in a closes sytem where there is no space available for lagoons.
Duckweed is often used in lagoons & then harvest and sold as animal feed.
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