Glossary of words for 
Troubled Waters

aeration  the process of exposing something to air or another gas; specific uses include: the passing of air through a substance, especially through a liquid.

cellular respiration the process within living cells in which carbohydrates are acted on by enzymes to produce energy, atmospheric oxygen combines with hydrogen to form water, and carbon dioxide is released as a waste product.

Dissolved oxygen the amount of oxygen dissolved in the water and measured in mg/L

fecal coliform is an indicator bacteria found in the fecal matter of warm-blooded animals. It is measures in colonies/100 ml.

nitrogen is found in the form of nitrates which can be found in fertilizers an animal wastes. It is measured in parts per thousand.

pH shows the hydrogen-ion concentration of an aqueous solution, used to express its acidity or alkalinity. At 25°C (77°F), a neutral solution, such as pure water, has a pH of 7; a pH under 7 indicates that the solution is acidic, and a pH over 7 indicates that the solution is alkaline. (An abbreviation for potential of Hydrogen.)

phosphates are found in phosphates and fertilizers. It is measured in ppm (parts per million)

photosynthesis the fundamental chemical process in which green plants (and blue-green algae) utilize the energy of sunlight or other light to convert carbon dioxide and water into carbohydrates, with the green pigment chlorophyll acting as the energy converter. This process releases oxygen and is the chief source of atmospheric oxygen.

salinity amount of dissolved salts in water, measured in ppt (parts per thousand)

sewage  any liquid-born waste that contains animal or plant matter in suspension or solution, chemicals in solution, or soils and storm water.

Stella model is an icon-based, model building and simulation tool  developed by High Performance Systems, Inc. Their home page is  http://www.hps-inc.com/index.htm  An explanation of how Stella works as well as a Stella DEMO can be downloaded at  http://www.hps-inc.com/STELLAdemo.htm .

temperature the thermal agitation of particles in a system, expressed in terms of units that are designated by a value on a scale. The temperature of a systema quantity that is a measure of the average kinetic energy due to determines the direction of heat flow with respect to the system; heat will flow from a region of higher temperature to an adjacent region of lower temperature. The level of sensible heat energy of the atmosphere as measured by a thermometer and expressed on a given temperature scale, usually Celsius or Fahrenheit. 

turbulence   a state of disorder, disarray, or agitation; in a moving flow of water, can be caused by wind.