Kelani River basin, Sri Lanka

 This means that no more than 45% of the total water supplied to the water supply system of the city of Colombo will be produced. It is noted that the Government of Sri Lanka has launched the Greater Colombo Water and Wastewater Management Investment Program. 

However, it has also been mentioned that it is difficult to reduce the amount of revenue water due to the impossibility of setting up a water supply channel within the city of Colombo. 

Based on that, the best solutions for this are replacement of System Input Volume (SIV) meters with electromagnetic meters for remote reading, modification of water supply network by replacement of pipes, replacement of defective meters, correction of quantity and updating of GIS network.

15. Kuruppuarachchi and Pathiratne, (2019). "Toxic Hazards of industrial waste receiving canal system in the lowe catchment of Kelani River basin, Sri Lanka" has been carried out. 

Elucidates in detail the toxic hazards of canalised industrial effluents in the lower catchment of the Kelani Ganges River basin in Sri Lanka. 

The study also provides effective strategies for assessing those risks and managing them properly. Based on that, the plant has explored the integrated use of surface water physical and chemical properties. 

For that, surface water samples were collected from 7 sites and analyzed in three periods (including dry and wet periods) and results obtained. 

As a result, industrial effluents pollute the Kelani Ganga river bed with high levels of toxins. Due to this the river water is highly polluted. 

This results in various ecological and biological effects. Proper methods to bring it under control have also been mentioned in this study.