Abstract
The control section is a location at which a unique relationship between the flow rate and the water depth (critical depth) exists. When the culvert flows under inlet control, the location of the control section exists into the culvert barrel at some distance from the entrance. The exact location of the control section has not been investigated until now. The present study demonstrates the exact location of the control section experimentally based on the measured elevations along the barrel for each run undertaken. Then the correlation between the critical depth and its location is presented as proposed deterministic equations. Thus, the aim is to find the section at which the critical depth is achieved, measured from the beginning of the barrel by using the empirical equations. The application of the proposed equations is specified in terms of the geometric and hydraulic conditions that have been adopted in the present study.
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