stream measurement The quantitative determination of the rate and amount of flow or discharge from a natural body of running water, such as a small river or brook
sound measurement Because of the large variations in sound magnitudes, and because the human hearing sensation seems to vary in a logarithmic way, logarithms are used in measurement of sound. The sound pressure level is given in decibels (dB)
noise monitoring The systematic deployment of monitoring equipment for the purpose of detecting or measuring quantitatively or qualitatively the presence, effect, or level of noise
chemical measurement of pollution The quantitative determination of the presence, extent or type of pollutant substances in the environment by studying the actions or reactions of known chemicals to those pollutants