The department of water resources shall receive and file all proposals for the construction of irrigation works to reclaim lands selected under the provisions of this chapter; keep for public inspection maps or plats, on a scale of two (2) inches to the mile, of all lands selected; receive entries of settlers on these lands, and hear or receive the final proof of their reclamation; and do any and all work required in carrying out the provisions of this chapter. It shall have authority to administer oaths whenever necessary in the performance of its duties.