Model-based evaluation of stormwater management alternatives for a new development
This case study analyses and compares the performance of different stormwater management options for a future residential development located in the Czech Republic. The drainage alternatives are developed from the original design proposed earlier by a team of consultants using conventional drainage design approaches. The potential shortcomings of the original design as well as the performance of its alternatives are analysed with the use of a rainfall-runoff simulation model built specifically for this purpose. Four design scenarios were considered: design provided by the consultancy with oversized sewer and source control measures; modified design with on-line detention tank and source control measures; conventional drainage with on-line detention tank; conventional drainage without any detention facilities. All design scenarios are compared and evaluated in terms of their hydraulic performance and construction costs. The results indicate that even when the system layouts are adjusted for the same level of service given by the return period of the rainfall, they can perform differently under extreme rainfall conditions. Moreover, present findings suggest that a decentralized distribution of storage capacity within the catchment could contribute to cost savings when compared to centralized downstream flow control.
This is the final version of the article. Available from NOVATECH via the URL in this record.
NOVATECH 2016: 9th International Conference on planning and technologies for sustainable urban water management, 28 June -1 July 2016, Lyon, France
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