Integrating Flood Risk Into Catchment Management - Michael Butts (DHI)
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The document discusses the integration of flood risk management into catchment management, emphasizing structural and non-structural measures such as dikes, zoning controls, and real-time monitoring networks. It highlights the challenges posed by land use changes, seasonal flooding, and ecological impacts in specific river basins, advocating for a balance between infrastructure protection and ecosystem restoration. The importance of moving from flood forecasting to real-time catchment management is underscored to address various flooding processes effectively.
Integrating Flood Risk Into Catchment Management - Michael Butts (DHI)
- 1. INTEGRATING FLOOD RISK INTO CATCHMENT MANAGEMENT Michael Butts Head of Innovation, DHI
- 2. Structural Non-structural Dikes Zoning controls Polders Regulation of construction on flood plains Flood Diversion channels Flood proofing Real time monitoring networks Flood forecasting Control structure e.g. gates Optimization of reservoir and structure operations Pumps Flood preparedness Reservoirs Public Educations Flood insurance
- 4. Natural flood level – estimated With dam break DAM BREAK Photo Courtesy of DHI DK.
- 6. FLOODING from BELOW Via SEWERS
- 7. FLOODING from BELOW Via GROUNDWATER Source: NOAA - Tropical Storm Fay, 08. 20.2008
- 8. • Prone to winter floods of fresh water and salt water inundations in connection with extremely high tides • Much of the low-lying area is designated as a wetland of outstanding ecological importance • Conflicts between land and water management activities PARRETT RIVER FLOOD CHALLENGES Courtesy of Nick Elderfield, DHI UK.
- 9. • Nature Conservation Areas at the level of National and Europe • Wild Life Habitat Re-Establishment of Wetland in UK • Increasing Number of Breeding, Feeding & Overwintering of Birds • Meanwhile, Decreased Species Number PARRETT RIVER ECOLOGY Courtesy of Prof. Ian Cluckie Chairman FRMRC
- 10. Catchment-wide sustainable development FRMRC study basin • Changes in land use • Flood Retention Storage (FRS) • …. Land use management Significant local effects Limited benefits on the catchment scale Significant benefits in terms of catchment management. • Sediment management • Ecosystem services • … PARRETT RIVER Courtesy of Prof. Ian Cluckie Chairman FRMRC
- 11. • Extensive urban development • Drainage has led to • Reduction in aquifer recharge • Increased freshwater discharge to estuaries located south of Picayune Strand • Invasion of former wetland areas by upland vegetation • Loss of ecological connectivity • Increased the frequency of forest fires • But also subject to flooding BIG CYPRESS BASIN CHALLENGES
- 12. • Regular cycles of floods and droughts • Channel hydraulics including complex structure operations • Extremely flat topography and limited storage • Close interaction between the surface water and groundwater BIG CYPRESS BASIN CHARACTERISTICS
- 13. REAL-TIME CATCHMENT MANAGEMENT If FU5_U_L1 >= 13.7 ft AND FU4s_U_L2>= 12.5 ft more than 2 hrs THEN SEND EMAIL: “The water level in the Faka Union canal is extremely high, please check operational condition of gates FU#4 & FU#5
- 15. Knowledge of river behaviour Measurements of river flows and diversions Forecast of inflows and demands COMPUTER AIDED RIVER MANAGEMENT (CARM)
- 16. CARM
- 18. Expect the unexpected … flood risk should be managed and planned both locally and at the catchment scale • To address fluvial, urban, groundwater & coastal flooding processes & their interplay • To resolve the conflict between protecting infrastructure & the built environment and restoring riparian ecosystems And to adapt effectively Move from flood forecasting to real-time catchment management SUMMARY