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| A newsletter on water, environment & health |
No. 2 2007 | |
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Boulder Creek Applies Innovative Flood Modelling Approach for Emergency Response Planning
Purpose of Modelling
Predicting inundated areas and response time is critical for planning emergency response in the case of flash flooding. To this end, the Urban Drainage and Flood Control District, in conjunction with the City of Boulder and DHI Water & Environment prepared a 2-dimensional (2D) model of overland flooding in the Boulder Creek drainage basin using the MIKE 21 modelling software developed by DHI Water & Environment. A 2D model was chosen for the ease of development and results presentation capabilities. "A 2D model can be developed rapidly and with much less effort than a 1D model, given that appropriate topographic data is available." said Chad Kudym from UDFCD.
The objective of the modelling was to provide Urban Drainage and Flood Control District (UDFCD) with static inundation maps, travel times for the flood wave propagation and flood animations for Boulder Creek, based on MIKE 21 model results. The inundation maps and flood animations were used for illustrative purposes during an emergency preparedness exercise in Boulder, CO.
Approach
The project consisted of two main tasks, hydraulic modelling and result presentation. The model bathymetry was developed from existing USGS 10m DEM data while the model extents were developed based on delineation of the area of interest provided by UDFCD. The model domain extends from approximately half a mile upstream of Orodell to Canyon Park. This represents a stream channel length of approximately 10 miles. The model extents are shown in Figure 1 below. Six inflow locations and corresponding dynamic flood hydrographs were used. The flood flow hydrographs, and inflow locations were specified and provided by UDFCD.
Figure 1: Flood Model Extents
Based on the hydraulic modelling result files, flood hazard maps were prepared delineating the maximum flood depths based on the simulation results, and 2D animations of the flood inundation were prepared. These maps and animations were used to aid in developing and testing an emergency response plan.
Figure 2: Sample Flood Hazard Map
"The animations and prepared mapping were extremely useful in understanding the areas at risk to flood and the travel time of the front of the flood" said Chad Kudym.
Results
Mr. Kudym continues "Flood modelling for emergency response planning is quite different than flood mapping for insurance purposes. The main modelling goals for emergency response planning are a reasonable estimate of inundation areas and response times, while keeping the model development costs to a minimum. Using a 2D model precluded the need to spend a lot of man-hours developing model geometry, and defining flow paths and flow splits. All of these were taken directly from the specified topography. By using a tool like MIKE 21 we were able to quickly develop representative flood models for emergency response planning at low cost." For more information on this project, or to discuss how MIKE 21 can be applied to your flood modelling or emergency response planning needs,
For further details please contact Eric Fontenot, DHI Water & Environment (ejf@dhi.us). | |
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DHI launches new technology for real-time dam optimization
DHI has developed a new real-time dam optimization technology, which provides operators of dams and reservoirs with the unique opportunity to manage available water resources safely and efficiently. The new system is designed to optimize water resources systems in real-time, taking into account multiple - often conflicting – objectives.
Click here to read more. |
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Optimisation of groundwater well field pumps
Pump scheduling at larger groundwater well fields is often based on experience and rather simplistic approaches. Hereby the water works is able to supply the amount requested by the consumers – but not at the lowest price possible.
Click here to read more. |
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Climate change impacts in Danish rivers
Photo: Hans Thodsen
During the last 4 years the Danish research project CONWOY has examined the influence of climate changes on the aquatic environment including river systems and the transport of nutrients. The MIKE 11 Rainfall-Runoff module (RR or NAM ) has been used in combination with empirical models in examining the influence of changed hydrological patterns on the transport of diffuse nitrogen and phosphorus. The empirical models distinguish between if the river flow origins from surface-near surface flow or base flow. The HIRHAM regional climate model, projects wetter winter and dryer summers for Denmark in a future climate scenario period 2071-2100 compared to the period 1961-2000. This results in larger amounts of winter surface-near surface runoff in the future scenario period. As the top soils are enriched with nutrients the surface-near surface runoff holds higher nutrient concentrations than the base flow, the river nutrient concentrations are therefore shown to increase up to 50% during winter months, and up to 20% on the mean annual scale. |
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WASY
DHI has acquired all the shares of WASY GmbH, Institute for Water Resources Planning and Systems Research, Germany .
WASY GmbH is undisputedly one of the global leaders within groundwater software and information systems. WASY is the producer of state-of-the-art groundwater software products, including FEFLOW, the leading finite element groundwater modelling package in the world. With this merger, DHI is strengthening its product family, expertise and activities particularly within the groundwater field worldwide and adding about 50 highly competent professionals to the staff
Click here to read more. |
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DHI Women's Water Fund - advancing career opportunities in water management
The DHI Women's Water Fund has been created as an initiative benefiting from the “King Hassan II Great World Water Prize” presented to Prof. Torkil Jønch Clausen of DHI at the Fourth World Water Forum in Mexico in 2006. The objective of the DHI Women's Water Fund is to support women in developing countries in advancing their career opportunities in the development and management of water resources.
The first call for applications earlier this year yielded a number of highly qualified candidates. In the selection process the Board gave priority to applicants with some years of practical experience in water resources management, rather than applicants with mainly academic or strictly technical backgrounds. The Board also prioritized applicants with a current leadership or management position in government, NGO or private sector with a potential to develop further in this role through support to career development.
Based on the above criteria the Board decided to award five grants to women from Iran , India and Armenia .
Next call for applicants is expected early 2008.
For further information please contact Ms. Winnie Thrane (wwt@dhigroup.com) |
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REACH has come into force
From Friday 1 June 2007 EU's new chemical legislation, REACH, applies in all of EU. The regulation is available on EU's website.
Click here to read more. |
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DHI has won a contract with the ESA funded MarCoast Project
MarCoast (Marine & Coastal Environmental Information Services) is a three year GMES (Global Monitoring for Environment and Security) project funded by the European Space Agency (ESA) with the aim of establishing a durable network of marine and coastal information services.
Click here to read more. |
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DHI Water & Environment Sets Increased Focus on Training, Capacity and Institution Building - Courses Around the Globe!
For a number of years DHI Water & Environment and its international subsidiaries have offered a variety of courses worldwide within water and environment. The courses range from short and intensive standard software and vocational training courses to dedicated, specialised training matching individual clients' specific needs and requests.
Our training activities aim to
- Make state-of-the-art technology easy to understand
- Combine advanced theoretical knowledge with practical experience
- Provide practical skills for problem solving
Alone in 2006 more than 150 standard software courses were held internationally in, amongst others, Australia, Bangladesh, Czech Republic, Denmark, France, Germany, India, Italy, Japan, Malaysia, New Zealand, Norway, People's Republic of China, Poland, Singapore, Spain, Sweden, Thailand, United Arab Emirates, the United Kingdom and USA. Course participants included significant representatives from governmental bodies, regional and local water bodies, research institutions and universities, professional bodies and engineering companies, harbour and coastal authorities, urban water utilities internationally. The "International Software Course Calendar" offers already now more than 200 courses to be run by our international offices in 2007.
We trust and believe that our focus on training and capacity building contribute to the sustainable development of water bodies worldwide and the development of more socially and environmentally sustainable water management strategies and global partnerships.
For further information on DHI Water & Environment course and training activities please contact DHI International Course Secretariat (courses@dhigroup.com) or consult our websites:
Vocational training: http://www.dhigroup.com/Consulting/VocationalTraining.aspx
Software training: http://www.dhigroup.com/Software/Training.aspx |
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| Contact - Africa & Middle East |
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