I would recommend you the CAPTED WORK software from Hydromantis.
The user-friendly drag and drop interface and comprehensive database of unit processes allows users to quickly and easily assemble a treatment plant model, enter characterization data, and run simulations. Develop and optimize advanced control schemes, predict effluent quality under varying conditions, conduct planning and capacity analysis or offer sophisticated training and development programs with a dynamic model of your actual or proposed plant.
Hi Venkata, I suggest you to have a look to the Delwaq software for water quality monitoring, very reliable I hope. I used Ribasim software of the Delft team for water allocation.