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Performance of Single and Double Sills for Steep Circular Culverts
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1971-01-01
[PDF-2.64 MB]
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Abstract:The hydraulic performance of steep sloped circular culverts was investigated experimentally using 18-inch diameter corrugated metal and concrete pipe culvert models of different geometrical configurations. One of the effect means found to dissipate the energy of supercritical flows in steep culverts was to force a hydraulic jump to form inside of the culvert pipe by placing a sill within the flared wing walls of the culvert. Although some amount of energy was dissipated by the jump, there still remained the problem of high velocity concentrations in the central region of the downstream channel following the nappe from the jump producing sill. The use of two sills in such cases accomplished more energy dissipation due to the fact that the energy of the nappe was dissipated in the pool created by the second sill. Furthermore, the flow was distributed in the downstream channel more evenly in a shorter distance.
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