Another characteristic feature of impoundments is their high capacity to retain particulate matter. This is well documen ted for input sediments. The percentage of particulate matter retained in deep impoundments is largely dependent on retention time, inflow concentration, and areal load (mass per unit area per unit time). These materials are influenced by internal transformations involving primary production and oxidation state, with consequences for phytoplankton standing crop, turbidity, and water color.
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