§ 21. Preparation contract, plans and estimates. The corporation shall
make surveys and prepare plans and specifications for work in connection
with the improvement, maintenance or repair of the canal system to be
performed under contract. It shall ascertain with all practical accuracy
the quantity and quality of all materials to be used and all other items
of work to be included in the contract and shall make a detailed
estimate of the cost of the same. The quantities contained in such
estimate shall be used in determining the cost of the work according to
the different proposals received.