Integrating Flood Risk Into Catchment Management - Michael Butts, Head of Innovation (DHI) Delivered at: - ICE Flooding 2014: Sustainable Flood Risk Management for Communities and Infrastructure 13 May 2014 - London, UK http://www.ice-conferences.com/ice-flooding-2014/

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

3. CARAVANS & OTHER
DEBRIS

4. Natural flood level –
estimated
With dam break
DAM BREAK
Photo
Courtesy of DHI DK.

5. ROADS or RIVERS

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

14. REAL-TIME CATCHMENT
MANAGEMENT

15. Knowledge of river behaviour
Measurements of river flows and diversions
Forecast of inflows and demands
COMPUTER AIDED RIVER
MANAGEMENT (CARM)

16. CARM

17. WETLANDS &
ENVIRONMENTAL
RELEASES

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

19. Michael Butts
E-mail:
mib@dhigroup.com
Web:
www.dhigroup.com
For more information