Question 1

A long culvert has the cross-section of an equilateral triangle with

side 0.7 m. The surfaces of the culvert have a Manning's roughness

n = 0.012 m-¹/³s and the streamwise slope is 0.01. The culvert

carries a flow of 0.35 m³ s. Assuming that the culvert does not

run full, find the normal depth (measured from the lowest point)

and the Froude number if the apex of the triangle is:

(a) at the bottom;

(b) at the top.