Feather River West Levee Rehabilitation
Project Areas A, B, C, & D
Sutter County, California
Project Area A The Feather River West Levee Rehabilitation project consisted of 11 miles of Segment 7 (Project Area A) along the Feather River. The goal of the project is to reduce flood risk and eventually remove more than 34,000 properties from FEMA Special Flood Hazard Areas. Compared historical seepage/slope stability issues, geomorphology, Helicopter Electromagnetic Surveys with new and historical boring logs, lab testing data and cone penetrometer data to provide preliminary and final levee rehabilitation options. Improvement options include installing seepage and stability berms, and soil/bentonite cutoff walls. Performed 2D steady state seepage and slope stability analysis at various cross section locations. Performed rapid drawdown analysis using Duncan, Wright and Wong methodology. Prepared Draft and Final Preliminary Geotechnical Design Recommendation Reports, Draft Geotechnical Recommendations Report, Draft Borrow Site Memo, and helped prepare a Geotechnical Data Report.