Dear aspirant hope you are doing well.

Dam affected certificate is used due to a bill to consolidate and alter the legislation relating to the rehabilitation of people impacted by specific projects in Maharashtra, as well as items related to or incidental to such projects

You can read the article for more details
https://www.careers360.com/question-is-dam-affected-reservation-for-those-people-who-are-living-in-dam-affected-areas-or-those-who-lost-their-habitat-in-dam-and-what-are-the-uses-of-that-certificate-in-neet-ug-maharashtra/amp

Thank you