dependence of hydrophytic vegetation, hydric soils, and wetland hydrology and that certain vegetation and soils are valid indicators of wetland hydrology in many circumstances. This protocol was criticized by threeÂ­ parameter fundamentalists who felt that there was a lack of sufficient hydrologic evidence to make a wetÂ­ land determination.
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SG is a measurement of the density of a liquid compared to the density of water. It measures the concentration of dissolved particles in the sample. Decreased SG values may be due to excessive fluid intake, renal failure, diabetes insipidus, as well as a variety of other factors.