National Engineering Handbook: Chapter 51 - Earth Spillway Erosion Model
Natural Resources Conservation Service, 2014
The earth spillway erosion model incorporated into the 1995 U.S. Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Water Resource Site Analysis Program combines basic physical principles with data gathered from performance of actual field spillways. This program predicts the extent of erosion expected from a given hydrograph through the spillway. The intended use of the model is to evaluate the potential for the flow to breach the spillway. To determine the potential for breach, the model iteratively analyzes various headcut formation and advance scenarios to determine the one representing the greatest risk of spillway breach. Each potential headcut is analyzed as if it were the only erosion occurring in the spillway. The eroded profile appearing in the model output is the combined profile resulting from all headcuts evaluated. Therefore, details of the predicted eroded surface may not exactly match those actually developed in the field.
Revision ID: 5878
Revision Date: 12/16/2022