OHIO DEPARTMENT OF NATURAL RESOURCES (ODNR S) STATEWIDE DAM CONSTRUCTION MONITORING PLAN Presented by: Chad R. Davis, PE
Agenda Update on ODNR s Dam Safety Initiative Goals of the Construction Monitoring Plan Construction Monitoring Plan Development Trigger Elevation/Alert Level Temporary Control Schematics Checklists Summary
ODNR s Dam Safety Efforts Standardized dam alert status normal; monitoring; watch; and warning Secured telemetry system for alert notifications Updated EAP and OMI for all class 1 dams Rehabilitated 6 high hazard dams; over $40M total Several high hazard dams in design totaling over $150M in construction cost Formulated training program for all dam operators Incorporated new delivery methods for construction Construction Monitoring Plans for dams under construction
Predetermined actions to shorten response time Streamline decisions in high stress situation Ensure that the right people make the right decisions Goals of the Construction Monitoring Plan Educate the contractor/field staff Clearly defined roles and responsibilities Visually oriented via a flow chart with decision trees
Construction Monitoring Plan Development Criteria developed by ODNR/Engineer (Setting trigger elevations) Upper threshold for lowest alert status Intermediate stages based on freeboard Threshold for emergency alert status Provide template to Contractor Contractor involved in plan finalization Gains a better understanding of the site and flood risks Reviewed by Engineer and ODNR All parties must agree with proposed actions Ensures equal buy in from Contractor, Engineer and ODNR
Construction Monitoring Plan
Water levels at/below normal construction pool Monitoring of forecast by Contractor Event >1 /24hrs triggers notification of ODNR/Engineer Contractor conducts Pre Event Checklist At the onset of event, dewatering operations would begin Pumping Siphons Opening lake drains Enables Contractor to control lower intensity Normal events with minimal coordination from ODNR/Engineer Normal Operations Green
Typical Event Conditions Yellow Above normal construction pool but below temporary water control design event Contractor is required to conduct continuous (24hr) monitoring Notification to ODNR/Engineer to mobilize onsite The ODNR/Engineer would determine the next steps Waiting the event out Prepare erosion protection measures Pull section of temporary measure (sheet pile)
Actions at Pond Lick
Major Event Conditions Orange Pool elevation is within the predetermined freeboard of temporary water controls Engineer to notify ODNR Dam Safety Continued monitoring Evaluate adjust/reinforce stabilization controls Pool elevation is still below the maximum design event
EAP Activation Red Pool elevation is within a foot of temporary control/dam crest ODNR enacts EAP Contact local agencies Alert individuals at risk Inform emergency response personnel
Schematic provides quick reference Construction Monitoring Plan Schematic Ensures everyone uses the same terminology Illustrates elevation of key features
Construction Monitoring Plan Checklists
Daily Site Inspection Checklist Encompasses daily operations pertaining to dam safety Alerts ODNR/Engineer of possible issues Ensures equipment is available onsite
Pre Event Site Evaluation Checklist Used during forecasted event Guides Contractor through preparation for an anticipated event Equipment, Materials, Personnel
Site Security/Safety During Event Checklist Ensures Safety of responding personnel Buddy system Lighting for low light conditions Fencing off hazardous areas Closing Roads
Dewater Facility Minimum Requirements Equipment required to handle high intensity events is identified beforehand Coupled with Daily Site Inspection Checklist, this ensures equipment is always onsite
Summary Simplifies complex water control plans into an easily followed flow chart Reduces uncertainty from emergency situations Provides clear path forward with predetermined elevations and resulting actions Provides contact information for key individuals Streamlines coordination efforts with key individuals who may not be accessible cell coverage Checklists confirm required materials/equipment are available
Questions