3 A planimeter is used to determine the areas of subgrade cu

3. A planimeter is used to determine the areas of subgrade cut (excavation) cross sections along a construction roadway. What is the total volume excavated (25 points)? Station (10Os of ft 16+84 Area from planimeter (ft\') 17+45 2

Solution

Station(100s of ft) Area from Planimeter(ft^2) Average area between the stations Length between the station Volume(ft^3) 16+50 0 16+84 410 205 34 6970 16+98 780 595 14 8330 17+08 820 800 10 8000 17+36 250 535 28 14980 17+45 0 125 9 1125 Total volume of excavation 39405