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downdrift beaches to preclude serious erosion of those beaches. The design of 

 a weir bypassing system requires knowledge of the wave and sand transport con- 

 ditions at a site and involves locating and proportioning the jetties, weir 

 section, deposition basin, and navigation channel, as well as selecting and 

 designing the desired updrift and downdrift beach configuration. 



Methods of data analysis and interpretation for weir-system design are 

 presented along with guidance on proportioning the various components of a 

 weir bypassing system. 



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