Qualitative evaluation of rock weir field performance and failure mechanisms
River spanning loose-rock structures provide sufficient head for irrigation diversion, permit fish passage over barriers, protect banks, stabilize degrading channels, activate side channels, reconnect floodplains, and create in-channel habitat. These structures are called by a variety of names including rock weirs, alphabet (U-, A-, V-, W-) weirs, Jhooks, and rock ramps. These structures share the common characteristics of: Loose rock construction materials (individually placed or dumped rocks with little or no concrete); Extents spanning the width of the river channel; and An abrupt change in the water surface elevation at low flows.
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