Abstract
Abstract. Urban flooding causes large economic losses, property damage and loss of lives. The impact of environmental changes, mainly urbanization and climatic change, leads to increased runoff and peak flows which the drainage system must be able to cope with to reduce potential damage and inconvenience. Allowing for detention storage to compliment the conveyance capacity of the drainage system network is one of the approaches to reduce urban floods. Contemporary practice is to design systems against stationary environmental forcings – including design rainfall, landuse, etc. Due to the rapid change in the climate- and the urban environment, this approach is no longer appropriate, and explicit consideration of gradual changes during the life-time of the drainage system is warranted. In this paper, a staged cost optimization tool based on the hydraulic performance of the drainage system is presented. A one dimensional hydraulic model is used for hydraulic evaluation of the network together with a genetic algorithm based optimization tool to determine optimal intervention timings and responses over the analysis period. The model was applied in a case study area in the city of Porto Alegre, Brazil. It was concluded that considerable financial savings and/or additional level of flood-safety can be achieved by approaching the design problem as a staged plan rather than one-off scheme.
Highlights
Floods are a recurrent threat to life and property
This paper presents a whole life cost optimization tool that can be used to determine the planning of detention delivery based on the aspirational hydraulic performance of the storm water drainage system for flood control and it provides a basis for proactive decision making in a changing environment
We present the case study application in Porto Alegre, Brazil, and show that due to the significant flexibility offered by staged-design at no additional cost, it is a better design paradigm compared to traditional “implement once and operate” schemes
Summary
Floods are a recurrent threat to life and property. An increasing trend in extreme flood events can be observed in many countries around the world. Apart from the traditional approaches that primarily involve improvements in conveyance capacity, on-site measures, such as provision of detention ponds, infiltration ponds, rain water collection and reuse etc., can be used to reduce the runoff peaks and reduce downstream flooding by providing flood attenuation during rainfall events (Woods-Ballard et al, 2007). This paper presents a whole life (staged) cost optimization tool that can be used to determine the planning of detention delivery based on the aspirational hydraulic performance of the storm water drainage system for flood control and it provides a basis for proactive decision making in a changing environment. The flood damage is computed in terms of expected annual damage, which can be defined as:
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