Q. What do you mean by Stage Discharge Relationship?
Regular recording of discharges over a period of time is essential for estimation of water resources of river basins and subsequent planning and utilisation. Daily discharge observations over a long period are sometimes not feasible being too expensive.
The estimation of discharge is then achieved by using proper stage discharge relation.
Besides the site requirements mentioned in connection with Velocity Area method, the following additional requirements are required to be satisfied in adopting the method of Stage Discharge relationship.
The site should provide a natural physical control for obtaining a stable stage-discharge curve. In the absence of such a control the site should provide at least partial control over the major range of stage discharge curve. If natural control is not available and the stream is sufficiently small, an artificial control in the form of a low sill or notch can be provided.