If the commissioner is unable to purchase such material or land at what he considers a reasonable compensation he shall request the governor and council to appoint a commission to assess the damages sustained by the owner, and thereupon proceedings shall be had in the same manner as for the assessment of damages by a commission for land taken for highway purposes.
RSA 228:30
1905, 35:9. PL 83 :9. RL 99:10. 1945, 188:1, part 10:10. RSA 229:9. 1981, 87:1, eff. April 20, 1981.