When such general plans shall have been adopted or approved, as aforesaid, every improvement to be made by said commission shall be made substantially in accordance therewith unless and until such general plans shall have been officially changed by the port commission after a public hearing thereon, of which at least ten days' notice shall be published in a newspaper in general circulation in such port district.
[ 1947 c 24 § 1; 1913 c 62 § 7; 1911 c 92 § 7; Rem. Supp. 1947 § 9695.]