MIKE by DHI Software for truly integrated catchment scale modelling CIWEM NATURAL FLOOD MANAGEMENT: THE EVIDENCE REQUIREMENTS FOR WIDER DELIVERY 10 Sept 2014 - London, UK

1. © DHI
Traditional approaches to flood risk management in the UK have focussed primarily
on the physics of flood water inundation from rainfall, rivers and the sea. An
understanding of the processes involved is critical in defining the level of flood risk
and in establishing an appropriate level of defence. However, the effects of both
natural catchment characteristics and upstream intervention on downstream
communities must also be considered. Indeed, in many cases, the response of
flood waters in the existing natural environment can, and should, be used to inform
catchment scale design and mitigation planning.
We believe that accurate modelling of flood risk and natural management options is
essential to the decision-making processes that can deliver flood resilient
communities. DHI was a pioneer in the development of truly integrated water
modelling software. Today, our software is unrivalled with respect to flexibility,
accuracy and performance. This allows the wider aspects of natural flood
management to be taken into consideration.
The MIKE by DHI product family encapsulates more knowledge and covers a wider
range of water modelling needs than any similar products. Our software tools are
used by professionals in 140 countries across all continents. They are also
available in many sizes, flavours and languages – and most recently also in the
cloud. Getting access to our global knowledge has never been easier! MIKE by DHI
represents more than 50 years of research and practical experience – right at your
fingertips. We help make you the expert in water environments.
MIKE SHE—INTEGRATED
CATCHMENT MODELLING
MIKE SHE delivers truly
integrated modelling of
groundwater, surface water,
recharge and
evapotranspiration - all
important aspects of
hydrology when your project
requires a fully integrated
model. No other tool or
combination of tools can
match MIKE SHE in terms of
seamless integration of all the
important processes of the
hydrological cycle.
OVERVIEW
RELEVANT SOFTWARE
BENEFITS
 State-of-the-art technology under
continuous development
 Professional documentation & tailored
training
 Dedicated UK support team to provide
support and advice throughout your project
 A range of different software licenses to suit
every need
MIKE BY DHI DELEGATE PACK - CIWEM 2014
NATURAL FLOOD MANAGEMENT: THE EVIDENCE
REQUIREMENTS FOR WIDER DELIVERY
MIKE by DHI Software for truly integrated catchment scale modelling
Flood Toolbox
ArcGIS based disaster risk
management
REAL TIME
River operations, flood
forecasting and early warning
For a free evaluation of our software, please
visit our stand at the conference or contact
us using the details on Page 4.

2. 2
MIKE SHE excels at:
 Integrated catchment hydrology
 Conjunctive use of surface water and groundwater
 Irrigation and drought management
 Wetland management and restoration
 Environmental river flows
 Floodplain management
 Groundwater induced flooding
 Land use and climate change
 Nutrient fate and management
 Groundwater remediation
 Integrated mine water management
With MIKE SHE you can investigate individual processes of
the hydrological cycle in detail and tailor the integrated model
to your needs by selecting the relevant level of detail for each
of the processes included in your model.
MIKE SHE includes 2D overland flow capabilities and full
riverine hydrodynamics (with MIKE 11). It thereby delivers a
powerful 1D-2D flood modelling tool, where
evapotranspiration, infiltration and groundwater are relevant.
For detailed groundwater-surface water interaction studies
(including water quality), MIKE SHE includes 3D, finite
difference groundwater flow, which discharges groundwater
drainage directly to surface water.
An unrivalled dynamic coupling of MIKE SHE with MIKE
URBAN is also available, allowing the accurate modelling of
the two-way interaction between pipes in the ground and the
surrounding aquifer. This facilitates the modelling of infiltration
to and leakage from pipes as well as the potential side effects
of infiltration prevention.
MIKE HYDRO BASIN—INTEGRATED RIVER BASIN
PLANNING
MIKE HYDRO Basin is a multipurpose, map-based decision
support tool for integrated river basin analysis, planning and
management.
MIKE HYDRO Basin is designed for analysing water sharing
issues at international, national and local river basin level. A
comprehensive, yet easy to use, product for those who solve
water allocation problems at all scales. A learning tool for
investigating options and making informed decisions.
Typical MIKE HYDRO Basin applications:
 Integrated water resources management (IWRM) studies
 Solve multi-sector water allocation problems
 Improve reservoir and hydropower operations
 Conduct transparent water resources assessments
 Evaluate irrigation scheme performance and crop yield
With MIKE HYDRO Basin you can:
 Create a unique overview of basin data
 Work efficiently and create results
 Establish transparency in your work
 Develop inspiring stakeholder workshops
 Overcome organisational barriers
MIKE BY DHI DELEGATE PACK - CIWEM 2014
© DHI
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 (for example, as a result of tree
planting, landscaping and so on).
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 with MIKE
11.
Natural flood management has many benefits (habitat
creation, nature conservation, pollution mitigation and so
on). It is of particular interest in rural rapid response
catchments, where it is not always possible to provide
flood defences.
AQUA REPUBLICA
Aqua Republica is a DHI and UNEP-DHI project that
focuses on the development and promotion of a not-for-profit
serious game in collaboration with a number of
partners.
The aim of the project is to promote sustainable water
resources management by sharing knowledge, to raise
awareness and build capacity in some of the most critical
issues in water resources management through serious
gaming, where participants can experience making
decisions in managing a catchment in an interactive and
engaging way, and in doing so learn about the
connectivity and importance of water resources, as well
as the need for careful management.
While the world of Aqua Republica is fictitious, the
challenges of sustainably managing a limited supply of
water resources in a situation of growing demand
between multiple users and uses are very much based on
real life scenarios.

3. 3
MIKE FLOOD
MIKE FLOOD is the most complete toolbox available for flood
modelling. It includes a wide selection of 1D and 2D flood
simulation engines, enabling you to model virtually any flood
problem. Whether it involves rivers, floodplains, floods in
streets, drainage networks, coastal areas, dam, levee and
dike breaches or any combination of these – MIKE FLOOD
provides results.
MIKE FLOOD is applicable at any scale from a single parking
lot to regional models. Independent studies show that you can
save months of effort and create more reliable models by
upgrading from standard 1D modelling to MIKE FLOOD.
Typical MIKE FLOOD applications include:
 Rapid flood assessments
 Flood hazard mapping
 Flood risk analysis for industrial, residential or cultural
heritage areas
 Flood contingency planning (for example, planning of
evacuation routes and priorities)
 Impact assessments of climate change issues
 Flood defence failure studies
 Integrated urban drainage, river and coastal flood
modelling
MIKE FLOOD features:
1D Engines
1D river network – based on DHI’s classic hydrodynamic
engine for rivers and open channels.
1D sewer network – based on DHI’s equally classic engine for
sewer and drainage networks.
2D Engines
Single Grid – the classic rectilinear model. Easy to set up and
easy input/output exchange. It is now available with parallel
processing.
Flexible Mesh (FM) – maximum flexibility for tailoring grid
resolution within the model. The FM engine supports parallel
processing.
A range of structures (including culverts and weirs) can be
handled both in the 1D and the 2D engines. In addition,
operational structures can be included in the 1D networks
using add-on modules.
The 1D and 2D engines can be coupled to provide fully
dynamic and integrated modelling to investigate complex
problems. MIKE FLOOD features a fully dynamic and
integrated modelling approach for coupling Riverine, Urban
and 2D Overland models depending on your project
requirements.
URBAN FLOODING
Today's demand for accuracy often calls for using a 1D pipe
flow model combined with a 2D overland flow model. MIKE
FLOOD offers such a model combination through the coupling
of MIKE URBAN CS (Catchment Systems) and MIKE 21.
MIKE FLOOD efficiently simulates any cause of urban
flooding, including heavy local rainfall, insufficient flow
capacity of storm water inlets or the drainage network, and
flooding caused by overtopping of nearby river or coastal flood
defences.
RIVERINE FLOODING
MIKE FLOOD is an efficient and flexible tool for river flood
modelling when investigating flood hazards and flood risk from
rising water levels in the river/canal system and/or from high
rainfall intensity in the catchment area.
Flooding can be investigated on multiple scales. These range
from large scale basin areas to local impacts in specific low
lying flood prone areas along the river.
When simulating river flooding, the combination of a 1D open
channel model using MIKE 11 and a 2D overland flow model
using MIKE 21 is typically preferred.
The flexibility of the combined 1D-2D engines provides
numerous opportunities for analysing complex issues such as:
 river conveyance problems due to improper
maintenance of the vegetation
 limited flood storage capacity
 infrastructures crossing the river/floodplain
 operation of hydraulic structures and reservoirs
 dam breaks or levee breaches
 changes in land use
MIKE 11 and MIKE 21 can be coupled either at specific points
or distributed along entire river stretches on either side of the
main river channel.
COASTAL FLOODING
MIKE FLOOD is ideal for efficient and accurate assessment of
coastal flood risks, whether they are related to flooding of
coastal cities and infrastructures, or to the inundation of
reclaimed or low lying areas.
MIKE FLOOD offers the possibility to investigate the effects of
coastal protection, such as dikes/polders and tidal gates or
other operational structures in delta areas.
MIKE BY DHI DELEGATE PACK - CIWEM 2014
© DHI / Photos: iStock © Mike Bentley
CARM
CARM is a Decision Support System built around our
MIKE CUSTOMISED by DHI and MIKE by DHI software.
CARM integrates our fully hydrodynamic models, which
reproduce key catchment and river processes, with real-time
measurements for the entire catchment system. This
information can then be used to make catchment based
decisions (for example, around the timing and magnitude
dam releases) to optimise water use within a catchment.

4. 4
GOING BEYOND HYDRODYNAMICS
For more than a decade, MIKE FLOOD has offered complex
and flexible features for coupling 1D and 2D hydrodynamic
models. Flood extents and flood hazards have been some of
the key issues for flood risk management. These issues will
still be the focus for many modelling applications in the future.
However, in order to support wider EU Water Framework
Directive objectives, there will be a need for more detailed
studies – particularly water quality assessments.
MIKE FLOOD now offers the option to simulate the transport
and spreading of pollutants during a flood event. This is done
via a fully dynamic coupling of the Advection Dispersion
modules of MIKE 11, MIKE 21, and MIKE URBAN.
MORPHOLOGY
The primary long-term factors affecting river hydrodynamics
and flood risk are climate change and urbanisation. However,
the consideration of other factors may also be critical.
Morphological change for example, is too often limited to the
consideration of scour or silting at structures, and to the
development of river maintenance schemes.
For broad scale sediment transport studies, MIKE 11 may be
sufficient. However, the MIKE 21 Flexible Mesh series is
preferred for detailed design of flood defences or other
structures, bank stability assessments and assessments of
the effectiveness and impact of erosion control measures
(hard or soft engineered) on river health and future habitats
(for instance, fish spawning grounds). More advanced
morphological modelling – including planform change – is
possible using MIKE 21C (Curvilinear Grid).
GROUND WATER AND PORUS MEDIA
FEFLOW is our state-of-the-art integrated groundwater
software package. It us used for the modelling of fluid flow,
transport of dissolved constituents and heat transport
processes in the subsurface. FEFLOW is not only a powerful
tool for groundwater modelling. It is also a very general
simulation tool for a wide range of problems involving flow and
transport of contaminants or heat in porous media. FEFLOW
is also used extensively for the modeling of contaminations
from abandoned mines and for the simulation of geothermic
energy systems.
MIKE BY DHI DELEGATE PACK - CIWEM 2014
DHI Water Environments (UK) Ltd
Davidson House
Forbury Square
Reading, RG1 3EU
United Kingdom
+44 (0)1189 000745 Telephone
mikebydhi.uk@dhigroup.com
www.mikebydhi.com
ABOUT DHI
DHI are the first people you should call when you have a tough challenge to solve in a water
environment. Whether it is a river, a reservoir, an ocean, a coastline, within a city or a factory. Our
world is water, and our knowledge of water environments is second-to-none. It represents 50 years of
dedicated research, and real-life experience from more than 140 countries.
We strive to make this knowledge globally accessible to clients and partners by channelling it through
our local teams and unique software.
So whether you need to save water, share it fairly, improve its quality, quantify its impact or manage
its flow, we can help. Our knowledge, combined with our team’s expertise and the power of our
technology, hold the key to unlocking the right solution.
© DHI / Photos: iStock © Василий Тороус
USING MIKE FLOOD AD & 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.
CLIMATE CHANGE ADAPTATION
At DHI, we have developed a set of
Climate Change Guidelines. For your free
copy visit climatechange.dhigroup.com