Features of a Chevron Weir Rock Rampby R. J. Wittler, (M.ASCE),
Abstract: This paper presents the features of a new type of low profile grade control structure, the chevron weir rock ramp. As the name infers, the planform of the structure is in the shape of a chevron. The weir crest angles with the vertex of the angle pointing upstream. The constituent material is angular rock, sized according to standard riprap sizing criteria. Downstream of the rock weir crest is a ramp of rock, angling the flow towards the center of the structure at its toe. The first implementation of this type of grade control structure is by Reclamation on the Muddy Creek Demonstration Stream Restoration Research Project. After two seasons in place, nine grade control structures are performing within expectations. In late 1995 Reclamation installed two grade control structures using an evolved design based upon observations and performance of the original design.
Subject Headings: Drop structures | Rocks | Structural control | Grade control structures | Weirs | Rivers and streams | Ecological restoration
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