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Providing planning framework for climate adaptation to cities of Tát and Tokod
In 2014, the European Environmental Agency (EEA) together with Norway Grants, have approved a programme that will help solve water concerns of the cities of Tát and Tokod. The programme, Elaborating a Concept for Precipitation Management and Adapting to Climate Change in the Settlements of Tat and Tokod (EEA-C3-8), aims to find the best solution for the two municipalities in the issue of urban stormwater. The goal of the project is to increase knowledge about the effects of climate change in the topic of stormwater and to take the first steps at climate adaptation in the region, whilst mitigating damages caused by extreme rainfalls. In recent years, the cities have been under threat of urban flooding and high groundwater levels. DHI has been engaged to provide advanced knowledge of surface water, groundwater and urban water systems through a complex integrated mathematical model using the MIKE Powered by DHI MIKE SHE and MIKE URBAN (now MIKE+) software.
In the major part of Tát, the means of stormwater management is the infiltrationtrench. Infiltration trenches work well in general weather but are unable to fullyfunction when the water level of the Danube is high and when there is continuousrain, due to the increased ground water level. In Tokod, they faced problems withstorm water and the occurrences of wells after the end of mine water removalthrough pumping. Creeks bring high amount of storm water from the hills throughthe city into Únyi creek. In addition to this, due to the location of Tokod on thehillside, the culmination of stormwater trenches and the stone-bordered roadsfurther drive the water into the Únyi creek.
DHI has developed mathematical models which simulate water conditions in the two cities in order to evaluate and observe a more integrated process. These models are useful and exemplary for cities and communities with similar terrain and climate.Solutions planning guideWithin the project, a stormwater conceptual plan and planning guide were developed using our MIKE SHE and MIKE URBAN (now MIKE+) software. The guide helps the planning process by illustrating the effects on the drainage system after different rain events. Model scenarios based on these events result in the establishment of measurements that function as guidelines for the municipalities. These guidelines help in the management of the urban stormwater issue.
The use of the MIKE SHE and MIKE URBAN+ (now MIKE+) software to create complex modeling was necessary to understand the behaviour of the natural runoff system of storm water in Tát-Tokod. The complex modeling also provides an engineering solution to develop and improve the current system. This applied solution gives a good basis in understanding the behaviour of the stormwater drainage system and also provides an exploration of the processes happening on the hydrological catchment. The simulation model of the stormwater system allows us to get a detailed view of the capacity of the system, the location and reasons for the issues that surface. The application of simulation approaches that handle the complex flows, both surface and underground, simultaneously give a base for the conceptual measurements with regard to the optimal drainage and retention system.
Calibrated models were prepared, with our MIKE SHE and MIKE URBAN+ (now MIKE+) software which communicate with each other. We have provided the following models:
We have implemented these project parts:
We have provided analyses of the following:
Master Plan as methodologyAs part of our solution, we used the storm water network of complex Master Plan methodology. The Master Plan methodology is an approach at handling storm water issues, causes and actions in an integrated way. The reason for the use of the digital Master Plan is so that the unique or combined occurrence of different loads and/or measurements can be simulated as individual scenarios. This allows the simulations with the calibrated model, which mimics the real behaviour of the collection system, to give results that help us plan measurements in space and time.
In addition, both the effects of the proposed planned measurements and the effects from the lack of necessary measurements can be demonstrated easily. The results gleaned from the Master Plan can also be used in the planning of the stormwater management and urban management.
Flood protection and management of stormwater due to the effects of climate change is a worrying problem many cities face. Our work for Tát and Tokod is to provide them with a planning framework for stormwater management and a climate adaptation methodology to prepare for future extreme rainfall events. Our models help to establish measurements that serve as guidelines for municipalities to work out the best solution for flooding events In addition, our planning framework for the construction and reconstruction of drainage system ensures the system is at its optimum condition. This will mitigate possible damages caused by floods and bring a reduction of flood risks in a heavy rainfall situation.
Detection of the defects in the existing system
Suggestions and tasks for the sustainable stormwater management and retention
Developed and tested exemplary methodology
Municipalities of Tát and Tokod
MIKE SHEMIKE URBAN+ (now MIKE+)
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