Turbidity of the Khandepar swells after downpour rage
The incessant rain in the catchment areas of Khandepar and Kalem rivers during the intervening night of Thursday and Friday has raised the turbidity of raw water in the Khandepar river.
The Opa Water Works recorded river water turbidity of 325 NTU (nephelometric turbidity unit) on Friday afternoon.
Turbidity refers to opaqueness or cloudiness. Water containing 1mg of finely divided silica per litre has a turbidity of 1 NTU and up to 50 NTU is considered normal.
However, data shows that such a high rise in turbidity has been seen far earlier this year as compared to the past eight years.
Sunil Kerkar, an assistant engineer of the department of drinking water said the early arrival of the monsoon contributed to the spike in turbidity.
Kerkar said that the phenomenon is common during heavy rainfall. He said silt washes off from catchment areas and pours into river water, leading to high turbidity.
Sometimes consumers too get turbid water.
'Water is released to consumers only after proper filtration is carried out at Opa water treatment plants,' Kerkar said.
After raw water is drawn into a receiving chamber from a river, it flows into sedimentation tanks to allow silt to settle.
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Next, the water passes through three stages from sand filter beds to the chlorination plant and to the main balancing reservoir for storage and supply.
High turbidity levels, however, cost the state exchequer dearly, as several million litres of treated water is used to clean the clogged filters every year. The filters quickly become non-functional due to the density of mining sediments.
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