A circular section open conduit conveys liquid under maximum velocity conditions. Show that the depth of liquid is 81 per cent of the diameter. Show, without complete calculation, that this will not...

A circular section open conduit conveys liquid under maximum velocity conditions. Show that the depth of liquid is 81 per cent of the diameter. Show, without complete calculation, that this will not be the maximum discharge condition. Such a conduit having a diameter of 0.8 m is to discharge 0.6 m3 s−1 at maximum velocity. Find the required channel slope if the Chezy constant is 90 in SI units.