Water Quality Index of River Noyyal at Tirupur, Tamil Nadu, India

The study on some physico-Chemical and biological characteristics of Noyyal river at Tirupur, Coimbatore district was carried out. The sampling points were selected on the basis of their importance. Most of the drainage system of Tirupur carrying dyeing waste, industrial effluents and sewage, are allowed to mix with river water in and around the city. Water Quality Index (WQI) for Noyyal river at its source and before and after Tirupur has been calculated. For surface water, determination of water quality index becomes essential and prerequisite. Water quality index provides a system for rating water quality in terms of index numbers that offer promise as a useful tool in the administration of water pollution abatement.