What characteristic of anaerobic conditions affects water quality in reservoirs?

Anaerobic conditions are characterized by the absence of oxygen, which significantly affects the biochemical processes occurring in a reservoir. One of the main consequences of anaerobic conditions is the dissolution of metals, particularly iron and manganese. Under such conditions, these metals can be released from sediments or other sources into the water column in higher concentrations.

When the water is oxygen-depleted, the usual oxidation processes that would otherwise convert these metals into less soluble forms do not occur, allowing them to persist in higher concentrations in the water. This can lead to water quality issues, as elevated levels of iron can result in staining and unpleasant tastes, while manganese can impart taste and odor problems as well.

Understanding the dynamics of anaerobic conditions is essential for water operators, as it can help in managing and mitigating the adverse effects on water quality in reservoirs.