Section 539.543 - Surveys and examinations; direction and certification by irrigation engineer1. The board of directors shall cause such surveys and examinations to be made as will furnish a proper basis for an estimate of the cost of carrying out the construction work.2. All such surveys, examinations, maps, plans, and estimates shall be made under the direction of a competent irrigation engineer and certified by that engineer.Part 15:64:1919; A 1921, 118; NCL § 8026Part 15:64:1919; A 1921, 118; NCL § 8026