Q ST QUA TAT ALIT US O TY IN OF W N IN WA NDIA ATER A- 2 R ...

18.4 Water Quality of Medium and Minor Rivers in KeralaThe water quality monitoring of River Achenkoli, Ancharakandy, Ayroor,Bharathapuzha, Chalakudy, Chaliyar, Chandragiri, Chitthrapuzha, Corapuzha,Ithikkara, Kadalundy, Kadambayar, Kallada, Kallai, Karingode, Karmana,Karuvannur, Kavvai, Keecheri, Korayar, Kuppam, Kuttiyady, Mahe, Mamom,Manimala, Manjeswar, Meenachil, Mogral, Muvattapuzha, Neelaswaram,Neyyar, Pallickal, Pamba, Periyar, Peruvamba, Pullur, Puzhackal, Ramapuram,Shriya, Thallassery, Thirur, Uppala and Vamanapuram is carried out by the StatePollution Control Board of Kerala.pH does not meet the criteria in River Kadambayar at Brahmapuram (5.0); RiverKavvai at Kuttiyol Palam (5.8); River Puzhackal at Puzhackal Bridge & RiverRamapuram at Ramapuram Bridge (6.0); River Mogral at Mogral Bridge (6.1);River Pamba at Chengannur (6.1), Pamba Down (6.2) & Thakazhy (6.3); RiverKaruvannurr at Karuvannur Bridge (6.2); River Meenachil at Kidangoor, RiverPullur at Pullur Bridge & River Thirur at Thalakkadathur Bridge (6.3); RiverKuppam at Thaliparamba & Rayarom (6.4); River Manimala at Kalloopara &River Manimala at Thondra (6.4) and River Achenkoil at Chennithula, RiverKeecheri at Vadakkanchery Bridge & River Neelaswaram at Nambiarkal Dam(6.4). Conductivity is observed in the range of 25 µmhos/cm to 50000 µmhos/cmand high values are observed in River Ramapuram at Ramapuram Bridge (50000µmhos/cm); River Mogral at Mogral Bridge (49200 µmhos/cm); River Uppala atUppala Bridge (49000 µmhos/cm); River Neelaswaram at Hosdurg (46000µmhos/cm) & Nambiarkal Dam (8100 µmhos/cm); River Kallai at Kallai Bridge(44000 µmhos/cm); River Kuppam at Thaliparamba (39360 µmhos/cm); RiverCorapuzha at Kanayankode (34000 µmhos/cm); River Chaliyar at Chungapally(30000 µmhos/cm); River Periyar near Alwaye-Eloor (6600 µmhos/cm) &Purappallikavu (3600 µmhos/cm); River Ancharakandy at Meruvamba (3170µmhos/cm) and River Karmana at Moonnattumukku (2500 µmhos/cm) due toestuarine zone of these rivers on these locations.DO varies from 0.0 mg/l to 8.1 mg/l and DO does not meet the desired criteria inRiver Karmana at Moonnattumukku (0.0 mg/l); River Kadambayar atBrahmapuram (0.3 mg/l) & Manckakadavu (0.5 mg/l); River Chitthrapuzha atIrumpanam (0.6 mg/l); River Periyar at Kalamassery (2.4 mg/l); River Manjeswarat Bajrakkara Bridge (2.8 mg/l); River Kallai at Kallai Bridge & River Puzhackalat Puzhackal Bridge (2.9 mg/l); River Ramapuram at Ramapuram Bridge (3.3mg/l) and River Thirur at Thalakkadathur Bridge (3.6 mg/l).The value of BOD varies from 0.1 mg/l to 18.0 mg/l. All the monitoring locationsin Kerala on Medium and Minor River are meeting the criteria except RiverKarmana at Moonnattumukku (18.0 mg/l); River Kadambyar at Brahmapuram(9.4 mg/l) & Manckakadavu (4.4 mg/l) & River Chittrapuzha at Irumpanam (3.6mg/l) that indicates about the relatively low concentration of organic matter in134