Optimising the Heathcote Antoinette Tan DHI Jacobs and

Optimising the Heathcote Antoinette Tan DHI, Jacobs and CCC

• • • Background into the Job Heathcote Catchment and Model Active Management Optimisation Future Work © DHI A/S

© DHI

© DHI A/S

© DHI

LDRP © DHI

© DHI

Current Project • • • © DHI Update models to current design Screening Model Base scenario Come up with Operational plan for structures Test various “what if” scenarios Finalise Operation

Heathcote Basins © DHI

Basin Design First Flush Culverts Infiltration Maintain Water Levels Weirs Control Structures Control Flow © DHI SCADA

Awatea © DHI

Wigram © DHI

Curletts © DHI

Hoonhay/Eastman © DHI

Cashmere Worsleys © DHI

Current Project • • • © DHI Update models to current design Screening Model Base scenario Come up with Operational plan for structures Test various “what if” scenarios Finalise Operation

Screening Model © DHI

Link Channels © DHI

MIKE FLOOD model © DHI

Water Level © DHI

Discharge © DHI

Current Project • • • © DHI Update models to current design Screening Model Base scenario Come up with Operational plan for structures Test various “what if” scenarios Finalise Operation

Base scenario setup © DHI

Base Scenario Setup © DHI

© DHI

Current Project • • • © DHI Update models to current design Screening Model Base scenario Come up with Operational plan for structures Test various “what if” scenarios Finalise Operation

Controls for each basin • • © DHI Optimisation Travel times Realistic in terms of infrastructure available Different gate operation

Auto. Cal © DHI Culvert Height Closest to target Water Level Variable Objective Optimised Culvert Height

Auto Calibration © DHI

Objective © DHI

© DHI

Current Project • • • © DHI Update models to current design Screening Model Base scenario Come up with Operational plan for structures Test various “what if” scenarios Finalise Operation

What if Scenarios • • • © DHI Staging of basin implementation Variable rainfall SCADA down or incorrect Past events Tidal Scenarios Rain is forecast

Future work • • © DHI Real time optimisation Telemetry data Online system Give suggestions for gate settings

Conclusions • Working with complex models • Simplifying these models • Many Scenarios and Optimisation • Decision making tool for CCC • Reducing flood risk for residents © DHI

Thank you Antoinette Tan © DHI A/S