A 2.1 m diameter sewer is laid on a slope of 0.0032 m/m. If the Manning's Coefficient for the sewer is equal to 0.015 at all depths and flows, determine:
a) flow (Q) and velocity (V) when the sewer is flowing full,
b) Q and V when the sewer is flowing at a depth of 0.7 m,
c) Q and V when the flow in the sewer is at 60% of its capacity, and
d) V and depth of flow when Q = 1.6 m3 /s