title: Simplifying impact of urban development on sewer systems.
abstract: Linking urban development and urban drainage models is a more and more popular approach when impacts of pavement of urban areas on sewer system performance are evaluated. As such an approach is a difficult task, this is not a feasible procedure for everyday engineering practice. We propose an alternative method, based on a developed simple near-quadratic relationship, which directly translates change (increase or decrease) of paved area into a change in the return period (RP) of the design rainfall event or design rainfall intensity. This formula is simple to use and compatible with existing design guidelines. A further advantage is that the calculated design RP can also be used to communicate the impact of a change in impervious areas to stakeholders or the public community. The method is developed using a set of 250 virtual and two real-world case studies and hydrodynamic simulations. It is validated on a small catchment for which we compare system performance and redesigned pipe diameters. Of course such a simplification contains different uncertainties. But these uncertainties have to be seen in the context of overall uncertainties when trying to predict city development into the future. Hence it still is a significant advantage compared to today's engineering practice.
authors.affiliation: University of Innsbruck, Technikerstrasse 13, A6020 Innsbruck, Austria E-mail: manfred.kleidorfer@uibk.ac.at.
authors.forename: Manfred
authors.initials: M
authors.lastname: Kleidorfer
authors.affiliation: University of Innsbruck, Technikerstrasse 13, A6020 Innsbruck, Austria E-mail: manfred.kleidorfer@uibk.ac.at.
authors.forename: Robert
authors.initials: R
authors.lastname: Sitzenfrei
authors.affiliation: University of Innsbruck, Technikerstrasse 13, A6020 Innsbruck, Austria E-mail: manfred.kleidorfer@uibk.ac.at.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Rauch
mesh_terms: D002947:Cities; D004777:Environment; D008962:Models, Theoretical; D015203:Reproducibility of Results; D012498:Sanitary Engineering / Q000592:standards*