Friday, 26 July 2013
Assessing The Impacts Of Rural Land Management Change On Flooding And Flood Risk (The Catchment Approach)

MIKE SHE is a very powerful tool for assessing the effects of natural flood management schemes in the UK. The software has been used extensively for modelling wetland restoration in upland areas in different parts of the world.

The effects of tree planting, water meadows, and other riparian planting can be described by land use changes in the model and the impacts on evapotranspiration, unsaturated flow and surface runoff examined. It is also possible to describe the detention of water in the floodplain (e.g. as a result of tree planting, landscaping, etc).

Photo: iStock © Василий Тороус
The effects of cutting off drains, and altering surface flow routes, can be modelled using the MIKE SHE 2D Overland Flow module. Channel restoration and green bank protection can be handled by coupling to MIKE 11.

Natural flood management has many benefits (habitat creation, nature conservation, diffuse pollution mitigation, etc) and is of particular interest in rural rapid response catchments; where it is not always possible to provide flood defences.

A selection of useful (external) documents, papers and links can be found below: -

UK Hazard Mapping with MIKE FLOOD and ECO Lab: Solving the Debris Factor Problem in 2D Flood Modelling

MIKE by DHI Release 2012 introduced an option for generating Flood Hazard Maps in MIKE 21 / MIKE FLOOD using ECO Lab (without the need for customers to have an ECO Lab module in their licence!).

Depending upon the approach adopted (e.g. the ‘Flood Risks to People’ guidance from Defra / EA) MIKE FLOOD can utilise the flood water depths, velocities, and land use data to seamlessly calculate both the correct debris factor and appropriate flood hazard rating in each grid cell / element and at each time step in a simulation.

For the UK, the templates are based upon the Environment Agency document 'SUPPLEMENTARY NOTE ON FLOOD HAZARD RATINGS AND THRESHOLDS FOR DEVELOPMENT PLANNING AND CONTROL PURPOSE – Clarification of the Table 13.1 of FD2320/TR2 and Figure 3.2 of FD2321/TR1'.

Download the templates and supporting documentation here: -
* The four templates included in the .zip file are all ‘signed’ by DHI such that ECO Lab can be activated in a combined MIKE 21 / MIKE FLOOD + ECO Lab simulation and Hazard Maps are produced as an ‘on-the-fly’ result from the 2D simulation – without the need for the user to have an ECO Lab module in their license. The templates can be used for both MIKE 21 'Classic' and MIKE 21 FM!

The templates are provided ‘As is’ without warranty, so please check the results carefully if you use them.

For more information, and to request changes or updates to the templates, please e-mail

Tuesday, 23 July 2013
Simulation of Coastal Inundation by Waves Using MIKE 21

Inundation by storm surges and tsunamis, as well as smaller storm waves, is a considerable risk faced by coastal communities. Over the past few years, flood events on the eastern coast of the USA, as well as in Japan and the Indian Ocean, for example, have highlighted the need for an understanding of potential impacts. The instructional document here presents a summary of methods (as previously used by DHI) for investigating large wave inundation using MIKE by DHI software: -

This document is for information only and does not constitute consultancy advice (No liability for the consequences of any actions taken on the basis of the advice provided is accepted).

MIKE by DHI 2012 Service Pack 2 is available

Service Pack 2 for release 2012 is now available for download here. Service Pack 2 offers a few new features and a number of important corrections. Please see the updated release notes for information about the corrections and improvements.

If you have questions about MIKE by DHI 2012 or the latest Service Pack, please do not hesitate to contact

To download Release 2012 Service Pack 2 please click below: -

Simulation of extreme water levels around the coast of Australia

MIKE 21 FMHD was used to simulate extreme water levels around the coast of Australia in order to determine exceedence probabilities due to combined tide and tropical storm events. Ivan Haigh of Southampton University and a number of his colleagues working on the project have produced two very interesting papers detailing the model construction, validation and post-processing undertaken to derive the spatially varying data set. Ivan has kindly made the papers available to 2013 User Group Meeting participants: -
Dr Ivan Haigh's personal home page can be found here.

Sediment Modelling to Support the Design of New River Structures Using MIKE 21 FM

The complexities of mesh optimisation and sediment transport in a river are brought together in the presentation of Mark Cramman from MWH. Quadrangular elements have been used to define flow control structures in the complex river flow field and the performance of new structure designs have been assessed by considering the impact on sediment transport processes.

Sharing Experiences of Flood Modelling Using MIKE 21

Although unfortunately unable to attend in person this year, Lei Yang of Arup prepared two case studies of flood modelling using MIKE 21 FMHD detailing the typical issues raised and addressed by Flood Risk Assessments. Case 1 includes comments on the use of a one-dimensional weir structure in a coastal flooding scenario. Case 2 includes the use of buried culverts in an inland site with three brooks and a recorded history of flooding.

Using MIKE FLOOD AD and ECO Lab to model polluted flood waters and riverine water quality

MIKE FLOOD now includes the option for a fully dynamic 1D-2D Advection Dispersion coupling, which increases the range of applications substantially.

The new AD coupling in MIKE FLOOD enables users to simulate new interesting aspects such as: -
  • Floodplain contamination from polluted rivers.
  • Impact assessment on river quality from pollutant sources in flood prone areas during flood events.
  • The impact on concentrations of river pollutant in case of a release from an urban Combined Sewer Overflow.

MIKE FLOOD AD can be further enhanced by ECO Lab for advanced water quality simulations.

ECO Lab is the complete numerical laboratory for water quality and ecological modelling. You can develop exactly the model you need and describe the processes you wish. No ecological problem is too simple or too complicated for ECO Lab:
  • Open Equation solver for coupled ordinary differential equations.
  • Designed for point descriptions of processes of chemistry, ecology, etc.
  • All equations, parameters contained in flexible, portable ECO Lab templates (use DHI supported templates or create your own).
  • Integrated with DHI’s hydrodynamic models: Currently MIKE 11, MIKE 21 (hence MIKE FLOOD), MIKE 3 & MIKE SHE.
Wednesday, 10 July 2013
CIWEM Surface Water Flooding and Management 2013 - Plans, Delivery & Funding
26 June 2013 - London, UK

We would like to thank everyone who stopped by our stand for a talk - we hope you found it useful. Just for fun, here is a short video of the UK team at the event: -

A number of flyers were produced for the event, and can be found below: -

Thank you all once again.

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Welcome to DHI UK

DHI is an independent, international consulting and research organisation with the global objective of advancing technological development and competence with respect to water, in all of its environments.

Worldwide, we offer a wide range of consulting services and leading edge technologies, software tools, environmental laboratories, and physical model test facilities, as well as field surveys and monitoring programmes. Designated as a not-for-profit organisation, DHI is able to invest a considerable portion of its resources in research and development. Today we co-operate with many Universities, and research organisations, and are recognised globally for our innovation and expertise.

In the UK, DHI offers niche or specialist consultancy services in the water and environment market to government agencies, commercial entities and selected research organisations. We fulfil a research based specialist advisor role; a ‘Consultant to the Consultants’. We also supply and support the renowned MIKE by DHI suite of integrated water modelling tools.

MIKE by DHI software is the result of years of experience and dedicated development and has, in many regions, become the standard modelling tool. It transforms our science into practice and gives you the competitive edge and, through the DHI Academy, you can rest assured that there is a local team of highly skilled experts committed to train and support you every step of the way.

MIKE by DHI truly models the world of water - from mountain streams to the ocean and from drinking water to treatment plant and beyond.

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