3-D Effects on Estimation of Gradients, Seepage Flows and Evaluation of Internal Erosion Potential Failure Modes

This webinar will present the results of 2D and 3D numerical evaluations of seepage conditions around a developing piping defect.  An updated model similar to the first 3D numerical model performed at the University of Florida beginning in about 1980 (Townsend, 1981) will be presented to illustrate the importance of 3D influences on estimated seepage gradients, seepage flows and the evaluation of potential internal erosion potential failure modes.  The updated numerical models were developed using the computer code SVFlux.  One of the benefits of this program is an automatic remeshing routine that provides for more accurate estimation of seepage gradients in areas of seepage concentration such as at a discharge defect (influence on initiation processes), or as a pipe continues (progresses) in an upstream direction toward the reservoir or water source. A simplified method of estimating 3D influences on gradients and flow quantities will be presented that will allow practitioners to evaluate a number of different shapes and sizes of dam and levees.

Key takeaways from participating in this webinar include:

1. Importance of 3-D effects on assessment of seepage safety
2. Better understanding of internal erosion and related potential failure modes.
3. Increased understanding of some of the history of seepage research
4. Software for 2-D and 3D seepage evaluations
5. Use of judgment in assessing seepage issues and risk assessment