hi,

see environmental and water resources engineering is a sub discipline of civil engineering. however candidates of related discipline or civil engineering  are also eligible to apply. I suggest you to check the eligibility criteria before applying. to get admission in m.tech courses of iits you have to separately apply to the official website of the respective iits. however iit hyderabad have no courses of m.tech related with environment and water resource engineering, follow the below link to know in details:

https://iith.ac.in/academics/post-graduate/

To know about complete list of probable college name, based on your score, category please use Careers360 college predictor tool

https://engineering.careers360.com/gate-college-predictor?icn=QnA&ici=qna_answer