Seepage Rehabilitation for Embankment Dams: On-Demand
This webinar will review the current state of the practice for rehabilitation of embankment dams to address seepage issues. Seepage rehabilitation measures can generally be grouped into two categories: seepage reduction / limitation measures and seepage collection measures. Seepage reduction /limitation measures include such features as foundation grout curtains, low permeability blankets, and seepage barrier walls. These measures are intended to reduce or limit the amount of seepage that occurs through, beneath, and around a dam. Seepage collection measures include such features as blanket drains, toe drains, chimney filters / drains, and relief wells. These measures are intended to collect seepage which occurs in a manner that maintains stability of the dam and prevents internal erosion. All of these measures will be reviewed along with discussion of their appropriate applications. Case studies and examples will be used to highlight the applications of the various methods.
John W. France, P.E., D.GE, D.WRE
President, JWF Consulting, LLC
Mr. John France is a registered professional engineer employed by AECOM as a Vice President and National Technology Leader for Dams. He received BS and MS degrees in civil engineering from Cornell University. Mr. France has 42 years of consulting engineering experience, during which time he has worked on hundreds of civil engineering projects. For the past 35 years his professional career has been focused on dam engineering and dam safety services. During his career, Mr. France has been involved in various capacities in evaluating and remediating seepage issues for earth dams. He has written numerous papers on the topic, and in 2012 he was an invited speaker at a FEMA workshop on filters and seepage remediation. He was also engaged by the Montana Dam Safety office to prepare a technical note on chimney filter design for posting on the State’s website. Together with Jennifer Williams he has presented workshops on internal erosion failure modes for ASDSO and the States of Colorado and Wyoming.
Jennifer L. Williams, P.E.
Senior Geotechnical Engineer, AECOM
Jennifer Williams is a registered professional engineer with over 20 years of experience specializing in geotechnical design and analyses of earth dams. Ms. Williams is currently one of the managers within the AECOM dams group in the Denver office. She received her BS degree in civil engineering from Colorado School of Mines and MS degree in civil/geotechnical engineering from University of Colorado. Ms. Williams has provided dam safety engineering services including inspection, analysis, design, and risk assessment to several federal and private dam owner and operators. Ms. Williams leads the semi-annual publication on dam safety – Western Dam Engineering Tech Notes. She has conducted training on using risk-based condition assessments for managing dam inventories for the state dam safety branches of Colorado, New Mexico, and Hawaii. Ms. Williams is co-developing and co-facilitating a technical workshop on the Emergency Response to Seepage Incidents at the 2018 ASDSO national conference.