Channel Response to SCS Type-C Grade-Control Structures on Burney Branch, Mississippi

by Chester C. Watson, Water Engineering & Technology, Inc, United States,
Michael D. Harvey, Water Engineering & Technology, Inc, United States,

Document Type: Proceeding Paper

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


Five SCS Type-C grade-control structures were installed in Burney Branch in 1980 to remove 59.4 feet (18.1 m) of grade. The performance of the structures was evaluated in 1984 after they had been subjected to design capacity flows. The mean bed slope between structures was 40% steeper than the design slope, and mean tractive stress was 51% greater than the allowable tractive stress. Shear intensity values were an order of magnitude greater than those permitted by the TR-25 procedure. The higher than designed energy in the system is due to the high supply of bedload to the channel. The increased energy is utilized in transporting the supplied load and not in eroding the channel.

Subject Headings: Erosion | Drop structures | Channels (waterway) | Bed loads | Hydraulic loads | Hydraulic structures | Slopes | Sediment loads | Mississippi | United States

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