For making the conceptual model, the TDS concentration of the effluent was taken as from the CETP about 4.000 milligrams per litre to about 1.000 milligrams per litre at day as may be compared, in the lower regions.
The background TDS concentration in the native groundwater in the area in the granites is about 300 milligrams per litre.
Nakkavagu and Pettavagu streams behave both effluents and influents in different reaches.