This investigation was concerned with the analysis by model study of the complex flow behaviour down stepped spillways, and with categorising the various types of flow which occur. The tests covered a wide range of step parameters and flow conditions, and included both horizontal steps and those of adverse slope; possible scale effects on models of various sizes were also investigated. By recognising factors which influence the flows, a basis for predicting prototype behaviour was established.
The results of the study are presented in a series of dimensionless plots which readily yield the energy and force of flows leaving the spillway. Normally, at the base of the stepped spillway, it is necessary to incorporate a stilling basin, and the investigation was extended to include the stilling basin design appropriate to the flow from the spillway. Design procedures were developed so that the civil engineer, knowing the overall requirements of a spillway flow, may design the most acceptable type of stepped spillway and associated stilling basin.
For more information, please contact Matthew Parker (Matthew.parker@ice.org.uk)
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The hydraulic design of stepped spillways (2nd Edition) (Out of print publication, available electronically or as photocopy only)
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