Why are some dams muddy in winter and clearer in summer?
The salinity of all dams increases over summer as the water evaporates as a gas (water vapour), leaving behind the dissolved salts (stock drinking and seepage removes both water and salts). Increasing salinity drops out (flocculates) the clay turbidity. When the dams overflow in winter, salts are diluted and flushed out by lower salinity inflow so the dam salinity drops- to the inflow salinity if the dam overflows for long enough- and the dam goes turbid again.
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