Modelling side-weir diversion structures for stormwater management

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Abstract
Combined sewer diversions are designed to divert significant flows directly to the receiving water during rainstorms. To estimate pollutant loadings to the recipient water it is necessary to compute continuous hydrographs and pollutographs for the full period of potential overflow. Since a diversion is active only during part of a storm, diverting only part of the flow, a rating curve for the diversion structure must be obtained. Few structures have been adequately calibrated and their rating curves are not usually available.Overflow and diversion structures may be classified according to the shape of the sill or overflow control: end weirs, oblique weirs, and side spillways. Many structures experience hydraulic jumps of complex shape over much of the operating range. This paper reviews the hydraulics of side spillways and the SWMM-EXTRAN computer program. A new program called OVRFLO3 has been developed to dovetail with the SWMM package. Internal SWMM coding has not been changed. As a stand-alone program, OVRFLO3 will produce rating curves for side-weir diversion structures. The program has been applied to urban catchments in Hamilton, Canada.Validation of OVRFLO3 is discussed in the paper. Comparisons were also made between OVRFLO3, SWMM-EXTRAN, and a series of previous laboratory experiments conducted by others.

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