Spillway Gates and Dewatering Systems - Lessons Learned and Practical Solutions: Agenda

November 14, 2023
12:00 PM - 2:00 PM Eastern

• I. Introduction
  • Overview of the seminar - key items discussed will include the following:
    • Gate Analysis and Design
    • Gate Anchorage Systems
    • Dewatering Systems
    • Construction Experiences/Lessons Learned
• II. Gate Design
  • Design Criteria
    • High-Level Overview of Current Gate Design Guidelines
    • New Guidelines added in the USACE 2022 Manual
    • Unique Loading Conditions (such as why it may be necessary to design for PMF or other unique loading conditions)
  • Existing Gate Evaluation
    • Field inspection
    • Corrosion
    • Modeling Losses
  • New Gate Design
    • Design Improvements to Help Mitigate Issues with Historic Gates
      • Drain Hole Location/Detailing
      • Bracing Design and Checks
      • Material Specifications
      • Coating Systems
    • Hoist Compatibility
      • Capacity of Existing Hoist with New Gates
      • Limit Switch Design and Selection
      • USACE/AGMA Service Factors
    • Detail Improvements
      • FCM and FCW
      • Trunnion Pin Assemblies and Types
      • Gate Shoes
      • Wire Rope and Connections
      • Drain Holes and Detailing
      • Casting, Forging, Welding
      • Coatings
• Gate Anchorages
  • Gate Anchorages by Gate Type
    • Radial Gates
    • Hinged or Rotational Gates (I.e., Bear Trap, Crest Gates, Etc.)
    • Other Types
  • Radial Gate Anchorage
    • Post-tensioned versus Passive
    • Evaluation of Anchorage
  • Trunnion Girder
    • Loading of Trunnion Girders
      • Asymmetric Loading based on Spillway Gate Operations
      • End Piers
  • Retrofit of Existing Gate Anchorage Systems
    • Evaluation of Existing Systems
    • Retro Fit Option
• Dewatering
  • Dewatering System Types
    • Stoplogs
    • Floating Bulkheads
    • Needle Beam
    • Emergency
    • Other
  • Dewatering System Design
    • Design Guidelines
    • Lifting Beams
    • Installation Methods
  • C. Construction Implementation
    • Retrofitting Existing Dams for Dewatering Systems
    • Existing Stoplogs/Stoplog Slots or lack thereof
    • Construction Dewatering, Care of Water, and Flood Routing
    • Sealing of Stoplogs
• V. Construction
  • Rehabilitation versus Retrofit
    • Condition of Existing Gates and when to replace
    • Cost Framework for Each
    • Construction timing and Installation for Rehab vs Repair
  • Case Study of Existing Retrofits
    • Existing Side Seal Plate Alignment
    • Additional Unforeseen Corrosion/Required repairs
  • Other Construction Issues Case Study
    • Damaged Members
    • Heat Straightening Construction
    • Seal Leaking Guidelines
    • Operational Testing