摘要：Cooum is one of the degraded sub basins in Tamil Nadu. Surface water, groundwater in and aroundthe basin is polluted by factors such as industries and domestic waste etc. This paper highlights theimportance of sewage inflow through Cooum inlets and assess quality of the surface water andgroundwater influenced by the discharges in Cooum basin. Sewage inflow was highest in ElephantGate Bridge (3039 Cum/day) and Annai Kasthuriba Nagar (2651 Cum/day). Surface water resultsexhibited higher pH, BOD, COD, chloride and zinc content. Groundwater quality of the study area hasa higher pH of alkaline in nature and total dissolved solids in the range of 859-1611 mg/L. Sodiumconcentration was much higher than permissible limits (110-357 mg/L), and sulphate concentrationwas about 672 mg/L in Avadi region. Investigation was taken up for groundwater quality assessmentthrough Water Quality Index, for drinking purpose, of open well in Cooum basin. Groundwater variablessuch as electrical conductivity values vary from 1760 to 2540 µS/cm. Analysis was taken for theparameters such as pH, electrical conductivity, total dissolved solids (TDS), calcium, magnesium,sodium, potassium, bicarbonates, chlorides, sulphates and nitrates. WQI ranges from 221 (very poorwater) for Govindampadi to 321 for Avadi (unsuitable for drinking).
关键词：Cooum basin;
Sewage inflow;
Surface water;
Groundwater;
Water Quality Index
