Thursday, 1 August 2013
MIKE by DHI 2012 Hot Fixes

Just a reminder that, as with Service Packs, Hot Fixes are now available on our external website. We would recommend that you are up to date with the relevant fixes (both service packs and hot fixes), or at least are aware of them.

Hot fixes are generated between service packs and usually fix critical issues that can’t wait for the next service pack or major release.

To visit the Hot Fixes webpage please click below: -

Local Area Weather Radar for Urban Hydrology

Climate change can be expected to affect prevailing patterns of precipitation with extreme rain events becoming more frequent and more intense. This will increase the pressure on water collection systems and wastewater treatment plants. Warning and forecasting systems provide necessary tools for authorities and operators to plan ahead and make the right decisions. Accurate predictions can be made if sufficient data are available. However, the greatest uncertainty when modelling the response of drainage systems to rainfall is the rainfall itself.

The standard approach is to use rainfall measured by one gauge but traditional rain gauges provide data with low temporal and spatial resolution. When using rain gauges, it must be assumed that the rainfall is homogenous over the whole model area, which may be as large as a whole city. For the prediction of potential surface water flooding as a result of extreme rain events, this assumption is not valid.

Weather radars, in contrast to rain gauges, provide high resolution data over a relatively large area, the equivalent of many synthetic rain gauges in one installation. However, dedicated weather radars are expensive. Local Area Weather Radar (LAWR), developed by DHI from modified marine radar and using interpretation algorithms, can provide high resolution rainfall data at a much lower cost. Such systems are already installed in many cities worldwide. They detect the first raindrop falling and track the precipitation as it falls. This provides accurate rainfall data with high spatial resolution, which is suitable for input to flood warning and forecast models.

LAWR Advantages and Integration
  • Distributed rainfall measurements in a spatial resolution ranging from 500x500 m to 100x100 m with a 5 minute or 1 minute time resolution up to 30 km from the radar
  • Online animation of rainfall within the complete LAWR range
  • Up to a few hours' forecast (online) of coming rain events for use in optimisation of sewer and treatment plant capacity
  • Fully integrated with MIKE URBAN (from release 2007) which facilitates the import of LAWR data, visualisation of the event over the model and its catchments and simulation with fully distributed rainfall
  • LAWR data is supported by the full MIKE by DHI software suite

The image above shows a rain event imported into MIKE URBAN. It illustrates a classical problem - only part of the drainage system is receiving rain. If a user wants to analyse such an event based on a single gauge several kilometres away it would yield a very poor result. LAWR data provides the user with a whole range of new opportunities. It is possible to see the event move and evolve over the drainage system, and see which catchments receive the heavy intensities.

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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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