Dear chandrika, very good choose i good to know you have an interest in the environment engineering.Dear as per the previous year cutoffs i am providing you closing rank of good NIT for Environmental engineering - 

NIT WARANGAL                    13487

NIT TIRUCHIRAPPALLI           11313

NIT SURATHKAL                   14263

NIT CALICUT                        20560

 NIT ROURKELA                    20525

You know year by year competition increases due to this slight variation is possible in the previous year rank.

All the best