Performance Evaluation of Channels Stabilized with ARS-Type Low-Drop Structures

by Mark R. Peterson, Water Engineering & Technology, Inc, United States,
Chester C. Watson, Water Engineering & Technology, Inc, United States,
David Biedenharn, Water Engineering & Technology, Inc, United States,
Phil Combs, Water Engineering & Technology, Inc, United States,

Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance


Field and hydraulic investigations of seven ARS-type low-drop grade-control structures located in Mississippi indicate that most of the structures become submerged during flows with recurrence intervals of less than 10 years. Design criteria for the low-drop were developed from physical model tests where the ratio of the tailwater depth above the weir to critical depth at the weir was generally less than 0.8 with a mean value of 0.5. Data from the seven structures indicate that values of this ratio are generally greater than 0.8 for events larger than a 2-year flood. Differences in model and prototype performance may result from the deeply incised nature of the natural channels which causes tailwater effects to increase more in response to increases in discharge than might otherwise be expected.

Subject Headings: Drop structures | Erosion | Structural stability | Channel stabilization | Underwater structures | Hydraulic structures | Hydraulic models | Fluid flow | Mississippi | United States

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