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Technology Preview

Technology Preview. presented by Andrew Walker. Traditionally , flood management policies have been based on the design standard approach (degree-of-protection to be achieved).

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Technology Preview

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  1. Technology Preview presented by Andrew Walker

  2. Traditionally, flood management policies have been based on the design standard approach (degree-of-protection to be achieved). • In contrast, flood management policies that are based on risk focus on the consequence of flood events and the best alleviation measures over a given period of time.

  3. ICMRiskMastertakes into account all types of events based on their probability of occurrence. • It combines the inundation results of multiple events with a database of damage receptors (properties) and their vulnerability, based on the probability of occurrence.

  4. The outcome is an estimate of the economic impact of floods in terms of an Expected Annual Damage (EAD) value and a database of inundation depths ordered by return period showing the predicted flood recurrence for each property (damage receptor). • These results provide a comprehensive view of the hydraulic system performance and the consequences of flood events.

  5. Flood risk analysis in the UK is generally based on the Environment Agency’s National Receptor Database (NRD), which links to MastermapGIS data and to the MultiColouredHandbook (MCH). • The picture in the USA is more complicated, with the USACE offering being the highly detailed and specialised HEC-FIA.

  6. There are new database objects: • Damage receptors: points in the network. • Damage curves: non-geographic items held in a tree object, relating depth and duration to damage. • Risk calculation runs: tree objects that post-process hydraulic runs. • Object creation and manipulation can be achieved with a standard ICM licence, but risk calculations require an ICM RiskMaster licence.

  7. Damage receptors: typically property points in the network

  8. Damage curves: relating depth and duration to damage

  9. There are two new ‘model build’ processes: • Assignment of elements to damage receptors: to be done before a hydraulic simulation. • Allocation of damage curves to damage receptors: A pre-processing step of a risk analysis run which is independent of simulation results and unique for a given network / damage curve set.

  10. Assignment of elements to damage receptors

  11. Allocation of damage curves to damage receptors

  12. There are three new ‘simulation’ processes: • Calculation of hydraulic results for damage receptors, requires a RiskMaster licence. • Calculation of damages: post-processing of simulation results, done by a risk analysis run, available only with a RiskMaster licence. • Calculation of risk: post-processing of damage results, available only with a RiskMaster licence.

  13. Risk calculation runs: post-process of hydraulic runs

  14. The calculation of risk involves multiplying the damage result for each receptor in a simulation with the probability of occurrence of the event simulated. • The results of a risk calculation are: • an expected annual damage (EAD) for each receptor. • a depth/probability of exceedence curve for each receptor.

  15. RiskMaster Results Outputs • The new simulation results of duration and depth at damage receptors can be tabulated and can be themed on their value. • Damage results of monetary value are per-simulation and per-receptor. • Risk results are per-risk run and per-receptor. There is an EAD value and a depth/probability of exceedence curve for each receptor. • Damage and Risk results are tabulated in CSV and HTML formats.

  16. Example results output: A grid view of the damage results per simulation

  17. RiskMaster Results Outputs • Show the behaviour of the system against the spectrum of events. This makes it easy to understand if the main risk contribution comes from low return period events, long duration storms, etc, etc…. • A results table is generated for each component used in the damage calculations. This allows you to see the damage contribution for each component in the model (residential, commercial, industrial, etc, etc….).

  18. Visualisation of RiskMaster Results • Visualisation can be achieved by exporting the CSV results and importing the damage values as user fields into the building polygons and damage receptors. We will provide fully integrated GeoPlan visualisation in the next release of ICM RiskMaster.

  19. Risk calculation results: Inundation Depths(m)

  20. Risk calculation results: Receptor Damage(£) and Critical Return Period

  21. Technology Preview presented by Andrew Walker

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