Design of Riprapped Scour Holes for Flip Bucket and Overfall Spillways

by Steven L. Barfuss, Utah State Univ, Logan, UT, USA,
J. Paul Tullis, Utah State Univ, Logan, UT, USA,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Presented in this paper is a simple method of predicting pre-excavated scour depths and geometry for riprapped basins below flip bucket spillways. The input data needed for establishing the dimensions of the scour hole include an assumed riprap size, unit flow rates (maximum and minimum design), and jet energy. The method then estimates the length, width and depth of the scour hole for the chosen riprap size and unit flow energy. Scour data and scour prediction equations of five authors were analyzed and compared with the data collected during this study using dimensionless graphical procedures of V.D. Kotoulas. This comparison showed a consistent variation between depth of scour and unit energy. The design criteria presented are for bucket angles of 0 to 30 degrees, and for unit flow rates of q= 0.106 cfs/ft to 0.924 cfs/ft.

Subject Headings: Hydraulic design | Riprap | Scour | Spillways | Flow rates | Data collection | Comparative studies | Excavation

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