What are the average values of these coefficient for a sharp crested orifice?

The average discharge coefficient (Cd) for a sharp crested orifice typically ranges from 0.6 to 0.7. This value can vary based on factors such as the orifice geometry, flow conditions, and the fluid properties. In practice, a Cd of around 0.62 is often used for calculations involving sharp crested orifices in open channel flow.