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Improving decision quality in urban storm water management projects by using the 3DI system

Speet, Floor (2014) Improving decision quality in urban storm water management projects by using the 3DI system.

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Abstract:Climate change will lead to more extreme rainfall in cities. Together with urbanization, this will lead to an increased chance of flooding in cities. Measures should therefore be taken in the urban environment. Important is the decision about which measure will be implemented, a water simulation model can be helpful for this. The use of a water simulation model for this decision can possibly increase the decision quality. However, there is a lack of knowledge about the effects of the use of a model on the decision quality. The objective of this study is therefore to assess the impact of using a water simulation model on decision quality in urban storm water management projects. The studied water simulation model is the 3Di system. 3Di Waterbeheer is an instrument that can visualize flooding processes in 3D and can calculate the effectiveness of measures. The main research question is ‘What is the difference in decision quality of urban storm water management projects as Rainproof in Amsterdam caused by using detailed, quick and interactive models as the 3Di system in comparison to the current decision quality of these projects?’. Amsterdam Rainproof is a program that aims to make the city of Amsterdam more Rainproof in the future. The main question is answered by first studying the current situation of decision-making in urban storm water management projects (sub question 1). After this the decision quality while using the 3Di system is identified for these projects (sub question 2). Finally, the decision quality while using the 3Di system is compared with the decision quality of the current situation (sub question 3). The research questions are answered with a range of methods. Interviews are held to obtain information about the current situation of decision-making and about decision-making processes. After this, two cases are used to execute workshops. One case is a project in the Rivierenbuurt in Amsterdam, water management measures can be integrated in the redesign of a main road. The other case concerns the Houtmankade in Amsterdam. This is a low-lying area where adaptations are needed for future rainfall. Decision-makers from the municipality and the water board are brought together in these workshops to discuss about measures and evaluate the measures with 3Di. The most important workshop result is the questionnaire that is filled in by every participant. The decision quality of the process using 3Di is measured in the workshops by using eleven decision quality elements. Besides that, the decision quality difference between a process with and without 3Di is measured in the same way. The study has found that models are not often used in the current situation of decision-making in urban storm water management projects. Stakeholders discuss about the public space design by e-mail and standardized designs for water management are used. The use of the 3Di system is therefore mostly compared in this study with no model use in the decision-making process. The study has shown that the use of the 3Di system increases the decision quality on all elements. This is also valid when the decision-maker was using another water simulation model in their reference situation. The three decision quality elements that were most improved by using 3Di were the coherence of alternatives, the consciousness of the decision-makers perspectives and the understanding of the consequences of alternatives. The level of detail of alternatives was least improved. In addition, the decision quality of using 3Di itself was rated high. The use leads to a high understanding of the consequences of alternatives and was easy to use according to the participants of the workshops.
Item Type:Essay (Master)
Clients:
Nelen & Schuurmans, the Netherlands
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
Link to this item:http://purl.utwente.nl/essays/66158
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