The company shall mark the high-water line or contour around its reservoirs every 1/8 mile by means of substantial iron pins set in the ground in order to define, on the surface of the ground, the high-water line or contour using, as much as possible, section lines and other lines measured from the section lines. It shall also mark the various points designated in this section by means of substantial signs with the names of the points upon the signs, the same to be on iron posts set in the ground. Three maps are on file at the office of the city clerk. ('64 Code, § 36-16)