Question

An engineer’s plan shows a canal with a trapezoidal cross section that is 8 ft deep and 14 ft across at the bottom with walls sloping outward at an angle of 45°. The canal is 620 ft long. A contractor bidding on the job estimates the cost to excavate the canal at $175/yd3. If the contractor adds 10% profit, what should the bid be?

Answer 1

You need to know the thickness of the concrete canal walls, which should have been specified. Then you can compute the cubic yards of concrete required. The rest is easy.

Answer 2

$12800