An authority shall have the power to acquire, within or without the geographical boundaries of the member municipalities, by purchase or eminent domain proceedings, either the fees or such rights, title, interest, or easement in such lands and property, including but not limited to air rights and avigation easements, as the authority may deem necessary for any of the purposes of this chapter. The right of eminent domain herein conferred shall be exercised by the authority in the manner provided by law, as though the authority were a municipal corporation.