1. Discussion of Modelling Issues
Paul Samuels
HR Wallingford
4th I M P A C T W O R K S H O P
Zaragoza, 3-5 November 2004

2. Some Discussion Issues
Assess accuracy and robustness, i.e. reliability of flood propagation models by comparison with actual data
What should we compare?
Timing of arrival, rate of rise and fall, time of peak
Water level, water depth or inundation extent?
Peak discharge only or influence of hydrograph shape?
Understand the differences in topography - fixed bed assumption?
Estimate uncertainty of model output
Can we explain the differences - models, modellers, mesh size
Implications of these results for the Uncertainty Analysis
Gain insight into modeling problems and difficulties encountered in real life situations
What can we learn about data collection and management issues
Roughness estimation for extreme flood conditions
How would a 1-D model perform?
What guidance can we give to the professional community?
4th I M P A C T W O R K S H O P
Zaragoza, 3-5 November 2004