EFFECT OF FLY ASH ON WATER QUALITY AS INFLUENCED BY DISTANCE IN FOUR RADIANT DIRECTIONS FROM RAYALASEEMA THERMAL POWER PLANT (RTPP)1R. MAMATHA, M. SREENIVASA CHARI, G. KARUNA SAGAR, B. VAJANTHA, M.V.S. NAIDU AND A. GAYATHRIAbstract Ground water samples were collected from four radiant directions (north, south, east and west) and from each direction five samples were collected from four distances at 1.0, 2.0, 4.0 and 8.0 km from Rayalaseema Thermal Power Plant (RTPP). The ground water had alkaline pH and electrical conductivity was within the permissible limit. The abundance of cations in four radiant directions and at four distances are in the order of Na+> Ca+2> Mg+2> K+. The order of anions observed as Cl-> HCO3-> CO3-> SO4-2. The Sodium Adsorption Ratio (SAR) of ground water was within the permissible limit in all directions and distances. The Residual Sodium Carbonate (RSC) is <1.25 m eq-1 in the ground water collected at four directions and distances thus becoming suitable for irrigation. The water samples at north, south, east and west direction arecategorized as very high saline low sodium water (C3S1) but in east direction at 8.0 km radius and at 1.0 km radius of west direction was classified as very high saline medium sodium water (C3S1). |