Understanding how local conditions influence turbidity and re-suspended sediment, and using site-specific information in the consultation is encouraged. If information is available on how conditions (e.g., bathymetry, currents) and material (e.g., sand versus silt) may influence turbidity and re-suspended sediment at a site, action agencies and applicants should consider it in addition to the general guidance provided below. Turbidity (an optical quality of light transmission through a fluid containing sediment particles most often measured as nephelometric turbidity units) and Total Suspended Sediment concentration (TSS, a gravimetric measure of particles in suspension generally measured as milligrams per liter) are not directly comparable without calibration of instrumentation to in situ sediments (Davies-Colley and Smith 2001, Clarke and Wilber 2008).Įffects of the actions described below will vary based on site-specific conditions (Wilber and Clarke 2001).
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