HIDDEN DAM, CA - Dam Safety Program Dam Safety Modification Study Adam Riley, P.E. Project Manager USACE Sacramento Distri...
Presentation Summary <ul><li>Location & Description </li></ul><ul><li>Construction </li></ul><ul><li>Policy & Guidance Con...
<ul><li>Hidden Dam, Hensley Lake </li></ul><ul><li>Construction Completion September 1975 </li></ul><ul><li>Fresno River <...
 
 
Hidden Dam Typical Cross Section
Random Fill Select Fill Core Shallow DcG Fresh/Slightly Weathered Bedrock Gross Pool El. 540 Deep DsG Blanket/Chimney Drai...
 
 
Safety of Dams – Policy and Procedure (ER 1110-2-1156) DRAFT 10 July 2009 <ul><li>Guiding Document for USACE Dam Safety Pr...
Dam Safety Modification Studies and Documentation (Chapter 9) <ul><li>Guidance and Procedures for Reporting, Investigating...
Screening Portfolio Risk Assessment (SPRA) <ul><li>SPRA is the first step in portfolio risk management process </li></ul><...
SPRA <ul><li>Relative  Risk based method – Relative Life Risk & Relative Economic Risk </li></ul><ul><li>First began in 20...
H I D D E N D A M
SPRA Findings <ul><li>Lack of adequate foundation seepage control beneath embankment </li></ul><ul><li>Spillway potentiall...
DSAC HIDDEN DAM: DSAC II
Seepage concerns from the beginning
Current Seepage Investigations
Instrumentation
Spillway <ul><li>Can Spillway pass the PMF event? </li></ul><ul><li>Will Spillway channel erode during the PMF? </li></ul>
Seismic Considerations Intake Control Tower <ul><li>Potentially Inadequate reinforced intake tower for OBE and MDE </li></ul>
Dam Safety Modification Project Ongoing and Near-term Efforts <ul><li>Seepage Analyses – Phase 1 & 2 </li></ul><ul><li>Geo...
The Path Forward <ul><li>DSM Studies & Issue Evaluation Study (IES) </li></ul><ul><li>Schedule </li></ul><ul><li>Funding <...
<ul><li>QUESTIONS </li></ul><ul><li>? </li></ul>HIDDEN DAM, CA - Dam Safety Program Dam Safety Modification Study
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Riley Sess3 101309

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Riley Sess3 101309

  1. 1. HIDDEN DAM, CA - Dam Safety Program Dam Safety Modification Study Adam Riley, P.E. Project Manager USACE Sacramento District (SPK) October 27, 2009
  2. 2. Presentation Summary <ul><li>Location & Description </li></ul><ul><li>Construction </li></ul><ul><li>Policy & Guidance Considerations </li></ul><ul><li>Screening Portfolio Risk Assessment (SPRA) </li></ul><ul><li>Dam Safety Action Classification (DSAC) </li></ul><ul><li>Seepage Investigations </li></ul><ul><li>Hydrologic/Spillway Considerations </li></ul><ul><li>Seismic Considerations </li></ul><ul><li>Planned Activities/Investigations </li></ul><ul><li>Dam Safety Modification (DSM) Report </li></ul>
  3. 3. <ul><li>Hidden Dam, Hensley Lake </li></ul><ul><li>Construction Completion September 1975 </li></ul><ul><li>Fresno River </li></ul><ul><li>Madera County </li></ul><ul><li>16 mi NE of City of Madera </li></ul><ul><li>Flood Control, Irrigation, Recreation </li></ul>Hidden Dam, CA
  4. 6. Hidden Dam Typical Cross Section
  5. 7. Random Fill Select Fill Core Shallow DcG Fresh/Slightly Weathered Bedrock Gross Pool El. 540 Deep DsG Blanket/Chimney Drain Seepage Blanket
  6. 10. Safety of Dams – Policy and Procedure (ER 1110-2-1156) DRAFT 10 July 2009 <ul><li>Guiding Document for USACE Dam Safety Program </li></ul><ul><li>Risk-informed dam safety program activities </li></ul><ul><li>Dam safety portfolio risk management process </li></ul><ul><li>Paradigm Shift for USACE </li></ul><ul><li>Chapter 9 </li></ul>
  7. 11. Dam Safety Modification Studies and Documentation (Chapter 9) <ul><li>Guidance and Procedures for Reporting, Investigating, Documenting, and Justifying </li></ul><ul><li>For Completed USACE Projects </li></ul><ul><li>Addresses Risk Associated with Dam </li></ul><ul><li>Iterative 6 Step Process </li></ul>
  8. 12. Screening Portfolio Risk Assessment (SPRA) <ul><li>SPRA is the first step in portfolio risk management process </li></ul><ul><li>Approximately 620 Corps dams nationwide, many with deficiencies </li></ul><ul><li>Prioritize - “Fix the worst first” – highest risk first </li></ul><ul><li>Develop a Dam Safety Action Classification (DSAC) </li></ul>
  9. 13. SPRA <ul><li>Relative Risk based method – Relative Life Risk & Relative Economic Risk </li></ul><ul><li>First began in 2005 and Implemented via Technical Cadres </li></ul><ul><li>Same features are looked at for every dam under 5 different load conditions: </li></ul><ul><ul><li>Normal pool </li></ul></ul><ul><ul><li>50% exceedance water level w/OBE </li></ul></ul><ul><ul><li>50% exceedance water level w/MCE </li></ul></ul><ul><ul><li>Unusual (300 yr pool) </li></ul></ul><ul><ul><li>Extreme (PMF) </li></ul></ul><ul><li>Features rated as Inadequate (I), Probably Inadequate (PI), Probably Adequate (PA), or Adequate (A) </li></ul>
  10. 14. H I D D E N D A M
  11. 15. SPRA Findings <ul><li>Lack of adequate foundation seepage control beneath embankment </li></ul><ul><li>Spillway potentially inadequacy for the PMF event </li></ul><ul><li>Inadequate reinforced intake control tower for seismic loads </li></ul><ul><li>Spillway erosion during PMF </li></ul>
  12. 16. DSAC HIDDEN DAM: DSAC II
  13. 17. Seepage concerns from the beginning
  14. 18. Current Seepage Investigations
  15. 19. Instrumentation
  16. 20. Spillway <ul><li>Can Spillway pass the PMF event? </li></ul><ul><li>Will Spillway channel erode during the PMF? </li></ul>
  17. 21. Seismic Considerations Intake Control Tower <ul><li>Potentially Inadequate reinforced intake tower for OBE and MDE </li></ul>
  18. 22. Dam Safety Modification Project Ongoing and Near-term Efforts <ul><li>Seepage Analyses – Phase 1 & 2 </li></ul><ul><li>Geophysical Study </li></ul><ul><li>Instrumentation Study </li></ul><ul><li>Site Survey & LiDAR </li></ul><ul><li>Spillway Erosion Study </li></ul><ul><li>Materials Sampling </li></ul><ul><li>Seismic Hazard Analyses </li></ul><ul><li>Structural Analysis </li></ul><ul><li>Stage Frequency & Wave Run up </li></ul><ul><li>Inundation/Dam Break Mapping </li></ul><ul><li>Economic Floodplains </li></ul><ul><li>Interim Risk Reduction Measures (IRRMs) </li></ul><ul><li>Project Management Plan </li></ul>
  19. 23. The Path Forward <ul><li>DSM Studies & Issue Evaluation Study (IES) </li></ul><ul><li>Schedule </li></ul><ul><li>Funding </li></ul><ul><li>DSM Report Documentation/ Justification </li></ul><ul><ul><li>EIS </li></ul></ul><ul><ul><li>Independent External Peer Review (IEPR) </li></ul></ul><ul><ul><li>Risk Assessment </li></ul></ul><ul><ul><li>Remediation Alternatives & Recommendations </li></ul></ul>
  20. 24. <ul><li>QUESTIONS </li></ul><ul><li>? </li></ul>HIDDEN DAM, CA - Dam Safety Program Dam Safety Modification Study

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