-Cause pH changes outside the -Agitation of water organisms level of tolerance aerates it (e.g. rocks) -Lack of flow decreases DO High BOD can cause oxygen levels to -Urban and agricultural Biochemical Oxygen Demand fall runoffs Measure of DO needed to -suffocation of aquatic life -Discharge from industry completely breakdown -changes in toxicity of metals and sewage treatment organic matter in the (Measure of organic pollution) plants. water by aerobic bacteria.
-Cause pH changes outside the organisms level of tolerance -Agitation of water aerates it (e.g. rocks) -Lack of flow decreases DO Biochemical Oxygen Demand Measure of DO needed to completely breakdown organic matter in the water by aerobic bacteria. High BOD can cause oxygen levels to fall -suffocation of aquatic life -changes in toxicity of metals (Measure of organic pollution) -Urban and agricultural runoffs -Discharge from industry and sewage treatment plants.