Cry me a lake
According to a report by the Centre-for-Science-and-Environment the amount of faecal matter in sewage is monitored through coliform count — a water quality parameter that acts as an indicator of pathogens that most commonly cause diarrhoea, typhoid and a host of enteric or intestinal diseases. While coliform is not a cause of illness, it does indicate pathogens of faecal origin such as bacteria, virus or protozoa. <br> <br>According to the <keyword keytype="General" smid="0" usetype="2" source="Orion" keywordseo="Central-Pollution-Control-Board" keynameseo="central-pollution-control-board" actualkeyword="central pollution control board">Central Pollution Control Board</keyword> (CPCB), the total coliform organism or MPN/100 ml (most probable number) for drinking water source, without conventional treatment but after disinfection, should be 50 or less. <br> <br>For outdoor bathing, MPN/100 ml should be less than 500, and drinking water source after conventional treatment and disinfection, MPN/100 ml shall be 5,000 or less. <br> <br>In Doddakallasandra Lake, however, the water sample showed much higher value at 350x102, showcasing a high amount of coliform bacteria, which does not qualify as safe. <br> <br>Raghvendra B Pachhapur, resident of <keyword keytype="General" smid="0" usetype="2" source="Orion" keywordseo="Doddakalasandra" keynameseo="doddakalasandra" actualkeyword="doddakalasandra">Doddakalasandra</keyword> and ActionAid, India’s programme manager, said: “The high value of coliform indicates bad water quality. <br> <br>Sewage is still entering the lake. Other parameters like pH, dissolved oxygen and conductivity are good.” <br> <br>The report also showed an increase in biochemical oxygen demand. Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic conditions (when oxygen is present) at a specified temperature. The decay of organic matter in water is measured as biochemical or chemical oxygen demand.
