Water clarity in lakes and reservoirs
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5) Request a copy of the Consumer Confidence Report from the community water supplier.... When measuring water clarity, the date of measurement, the measurement itself and the source of turbidity, usually sediment (brownish muddy color), phytoplankton (greenish color), humic stain (tea color from decaying leaves or plants) or some combination of these, should be recorded for reference purposes.... Secchi disk measurements are mainly precise when taken on comparatively still, sunny days, preferably during the middle of the day from a dock or some sort of floating mechanism such as a boat, float tube, air mattress or life preserver....