In this paper, a new algorithm is presented for flow rating of weir boxculverts. Weir box culverts are compound culverts, which consist of a weir box in thefront, and a traditional culvert in the back. This configuration makes it quite difficultto obtain accurate flow rating with traditional culvert flow equations. In the newalgorithm, flow through weir and culvert is first calculated separately, then iterationmethod is used to systematically adjust water elevation inside the weir-box andrecalculate the flow. This loop keeps on going until the discharge continuity issatisfied with certain convergence criteria. This algorithm has been validated atvarious weir box culverts. The results show reasonable agreement with field flowmeasurements.
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