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Flood Modeller Suite 2017

What's new in Flood Modeller 4.3

Jon Wicks, Technical Director - FloodModeller Suite, CH2M

CH2M’s Flood Modeller software continues to be enhanced in response to user feedback as well as our development programme to bring efficiencies and new functionality to our users. This presentation will demonstrate some of the latest functionality added to the software.

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Flood risk communications

Craig Woolhouse, Deputy Director Flood Incident Management, Environment Agency

After all our work to model and evaluate what happens in the natural environment are we sure those who have to use our evidence are making the best use of it? The presentation will look at how we communicate flood risk and the expectations of those who have to make key decisions based on the models we produce.

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Insight into Flood Modeller Pro's 2D solver

Emma Bullen, Assistant Flood Risk Consultant, Arcadis

Arcadis is the sole provider of professional services for the Canal & River Trust. Our key flood related services include Reservoir Flood Studies, Flood Risk Assessments and Canal Breach Assessments. Since 2013 Arcadis have been using Flood Modeller 2D to predict the risk of flooding associated with a breach of canal embankments. The model predictions are used to predict likely loss of life and third-party damages. This information is essential to the Canal & River Trust to enable them to prioritise the allocation of resources to managing the risk of canal breaches on their waterway network. This presentation provides an overview of the methodology, as well as some of the Flood Modeller Pro 2D modelling challenges Arcadis have come across and solutions they have adopted.

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Overview of GeoRiver v5.0

Ben Gibson, Senior Hydraulic Modeller, JBA Consulting

The setup for hydraulic models can often be one of the most time-consuming aspects of flood modelling studies. If a large number of structures are in place along the watercourse, it can take a substantial amount of time to incorporate them into the model inputs. While this is reasonable when dealing with complex structures, the integration of relatively simple structures can represent an inefficient use of a modellers time. For many studies the information is already available from the survey data and therefore manually defining hydraulic structures in Flood Modeller is a partial duplication of effort.

This talk will demonstrate how the software GeoRiver can be used to bridge the gap between the often highly detailed surveying data collected and the data needed in sophisticated Flood Modeller simulations to define structures. This includes the steps needed to create structure data in the software and export it in a digital format to Flood Modeller with structure nodes and geometry. The talk will conclude by discussing the potential benefits of this streamlined approach and how it might be applied to other tasks undertaken by hydraulic modellers.

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Working with one of Europe's biggest hydraulic models

Rob Fraser, Chief Engineer (Modelling and Hydrology), GBV and Simon Lewis, Senior Technical Advisor, Environment Agency

The presentation will describe the modelling, using Flood Modeller Pro, to develop the Outline Design of the River Thames Scheme. The scheme is a major flood alleviation scheme between Datchet and Teddington, on the western edge of London. It includes a new 14km long flood channel and will reduce flood risk in what is currently the largest area of developed floodplain in England without flood defences. The modelling work for the scheme has used the Lower Thames model, which is the Environment Agency’s biggest hydraulic model and understood to be the largest of its type in Europe. The presentation will give a brief overview of the scheme and its key features; describe the Lower Thames model development; and explain how 1D-only and 1D-2D versions of the model have been used for different tasks within the study. It will also cover some of the challenges of working with such a large model.

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Replacing 111 flow forecasting models with Flood Modeller Pro by developing and adapting a global template

Odell Harrison, Senior Analyst, JBA Consulting

Development of a single new English forecasting system (the Future Flood Forecasting System or FFFS) is currently under way. The Environment Agency’s goal is to improve efficiency and increase flexibility across the country by running a small number of model types in a nationally consistent way. The chosen model types are:

  • Probability Distributed Model (PDM) for rainfall runoff modelling;
  • Flood Modeller Pro for flow routing or hydrodynamic river models; and,
  • Triton for coastal modelling.

This means converting all other model types ready for inclusion in the new system. Solihull Centre has the largest number of non-compliant models with over 100 Midlands Catchment Rainfall Runoff Models (MCRM) and over 100 Douglas-Dobson (DODO) flow routing models. This presentation provides information on the application and adaptation of a global template, developed using Flood Modeller Pro, to replace the existing routing models on the Rivers Severn and Trent and their tributaries. The new template is designed to allow the replication of storage and floodplain processes available in the existing routing models.

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Advanced functionality for everyday projects

Konrad Adams, Senior Developer - Flood Modeller Suite, CH2M

The presentation will uncover some of the lesser-known features of Flood Modeller in order to draw your attention to them and therefore improve your knowledge, capability and/or efficiency. Complementary to the morning’s “new features” presentation, this will (re-)introduce existing features which may have been long-forgotten or simply waiting to be discovered by the enthusiastic and inquisitive user. It is hoped that everyone can take away something from here, and if you have your own favourite “quirky” feature you want to share with the audience, there will be opportunity to do so too.

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Modelling of the River Cree using Flood Modeller Pro

Callum Anderson, Senior Hydraulic Modeller, Kaya Consulting

Calibration of flood inundation extents produced by flood models has been limited by the difficulty in collecting post-event flood data. Traditionally post-event data has been limited to observed flood levels at a few locations, or spatial mapping of flood extents based on trash marks left after a flood has receded.

With the advent of smart phones, social media and a populace better-informed regarding flooding, much more data can now be made available.

This talk describes the calibration of two linked Flood Modeller Pro 1D/2D models using data obtained during the winter 2015/2016 floods in Dumfries and Galloway. It describes the data collected from a number of innovative sources and how the data was used to improve model predictions.

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Challenges and lessons learnt in converting a hydraulic model to a different software package

Sam Bray, Consultant, Wood

Several project-specific challenges necessitated the conversion of an existing Flood Modeller Pro-TUFLOW model to Infoworks ICM.

The reasons behind the decision to convert the model can certainly be debated, but the focus of this presentation is the challenges and lessons learnt in attempting the conversion and in comparing the results between the models.

Conversion is difficult to automate, and significant manual interpretation is required to fill in or exclude data where representation of hydraulic features differ, for example when importing crosssections, replicating hydraulic structure representation and ensuring consistency in application of
boundary conditions. Other differences including the numerical schemes employed, and hence the 2D domain discretisation and 1D-2D link caused the models results to differ significantly in places, and various explanations were noted along the way.

The presentation highlights a few of the key challenges encountered in the conversion process and the methods used to overcome the issues. The justifications for the differences in results are explored and quantified to give an overall picture of the lessons learnt in converting the model.

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The application of Flood Modeller Pro in Sri Lanka

Chris Whitlow, Director, Edenvale Young

The overarching objective of Sri Lanka’s Climate Resilience Improvement Project (CRIP) is to reduce the vulnerability of exposed people and assets to climate risk and to improve the government’s capacity to respond effectively to disasters. A key deliverable is the development of river basin investment plans, accounting for climate change, for catchments covering almost half of the island including the Kelani basin which includes the capital city of Colombo. Dr. Chris Whitlow is the expert modeller for this World Bank funded project which was awarded to Atkins in 2016.

To support the development of the investment plans, which include both flood and drought mitigation options, flood and drought models are being produced which make use of Flood Modeller Pro, TUFLOW, SWAT and WEAP. TUFLOW GPU and SWAT are used to generate the basin scale runoff to the detailed hydraulic model which makes use of Flood Modeller Pro and TUFLOW Classic. The presentation will cover the role of Flood Modeller Pro as part of a system that makes use of the aforementioned external components in a relatively novel way.

A key role of Flood Modeller Pro has been in the development of rating relationships at stations where this process is very challenging due to location and data uncertainty. Another important component of the Flood Modeller Pro work has been the simulation of 45 gated structures in the minor flood defence embankments in the Kelani basin.

A critical aspect of the CRIP project is the capacity building element within the counterpart staff team and the presentation will also discuss this together with their response to Flood Modeller Pro as new users and some of the benefits and challenges associated with the new interface.

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