water stagnation at end of summer

bad ecology bubbles changing pattern contaminant contamination defilement design dirt dirty foam scum water dirtying discharge sewage drainage pipe environmental issue eutrophication froth impurity iron oxide film macrolevel microlevel oil organic matter organics stagnation summer branches trees reflected pond yellow leaves stagnant surface plume pollutant polluter pollution soap soft soiling spume stochastic process suds tracery bodies weightless