Abstract
Rock chute design information is consolidated from several sources to provide a comprehensive design tool.The rock slope stability, boundary roughness, and outlet stability of rock chutes are each discussed. Tests were performedin three rectangular flumes and in two full size structures. Angular riprap with a median stone size ranging from 15 to278 mm was examined on rock chutes with slopes ranging from 2 to 40%. The typical mode of channel failure isdescribed. An empirical prediction equation is presented relating the highest stable discharge on a rock chute to themedian stone size and the bed slope. A boundary roughness relationship is also presented that relates the Manningroughness coefficient to the median stone size and bed slope. These tests also suggest that the riprap size required forstability on the slope will remain stable in the outlet reach even with minimal tailwater. This article contains informationneeded to perform a rock chute design.
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