The department, through the board, is hereby authorized and directed to complete the work begun and continued under an act, approved the twenty-fifth day of July, one thousand nine hundred and thirteen (Pamphlet Laws, twelve hundred seventy, repealed), entitled “An act providing for the erection of a dam at the outlet of Pymatuning Swamp, and the establishment of a reservoir to conserve the waters thereof; providing for the taking of land and materials necessary thereto; vesting certain powers and duties in the Water Supply Commission; and making an appropriation,” and its amendments and supplements.