IOT Based Real Time River Water Quality Monitoring and Control System Dinesh P.M, Shree Sapnaa K, Kiranisha A.J, Sabeenian R.S, Paramasivam M.E and Manjunathan A E3S Web Conf., 399 (2023) 04013 Published online: 12 July 2023 DOI: 10.1051/e3sconf/202339904013