Solve Prob. 10.105 (a horizontal variation along an H-3 curve) by the approximate method of Eq. (10.52), beginning at (x, y) = (0, 0.82 ft) and using a depth increment Δy = 0.2 ft. (The final increment should be Δy = 0.18 ft to bring us exactly to y = 2.0 ft.)