Written by Staff Writer
01 Apr, 2014 | 10:36 pm
Salinisation has made the waters of the Kalu Ganga unfit for consumption. News1st carried out investigations into the issue. Why has there been salinisation of the waters of the Kalu Ganga?
The dry weather conditions have caused the water levels of the Kalu Ganga to recede. As a result, the amount of water flowing from the Kalu Ganga into the sea has reduced. However, ocean tides have caused sea water to flow upriver.
Salinisation has occurred from the estuary of the Kalu Ganga, about 12 kilometres upriver, where the Kethhena Water Purification station is located.
This purification station provides clean drinking water for over 300,000 people residing in Wadduwa, Kalutara, Payagala, Beruwela, Aluthgama and Benthara.
The National Water Supply and Drainage Board says that the salinisation of river’s water has caused the salinity of water supplied to these areas to exceed usual levels. As a result, water is now being supplied to the Kalutara area, through bowsers.
Sandbags are being used to build a temporary dyke to control the salinisation of the waters of the Kalu Ganga.Sandbags used in the dry season, are removed with the onset of the rainy season in order to prevent flooding.
In March last year, sandbags used in the dry season were removed with the coming of the rains.Officials at the National Water Supply and Drainage Board say that about 150,000 sandbags are required each time in order to build a temporary dyke.
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