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  • 1.
    Boo, Johan
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Magnusson, Nils
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Hållbar dagvattenhantering i brant terräng: En fallstudie av ett planerat bostadsområde i Gränna2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose: The continuous densification of urban environments with an increased amount of hard surfaces as a result, along with future climate change, involves a number of challenges that must be taken into account when applying a sustainable stormwater management. In addition to this, there are several other challenges that needs to be considered when planning for a sustainable stormwater management in residential areas located in steep terrain where an increased water volume and water velocity increases the risk of floods and contributes to an increased level of contamination in the runoff.

    This study aims at identifying suitable stormwater solutions for residential areas located in steep terrain.

    Method: The methods used to achieve the objective of the thesis have been literature review, document analysis, qualitative interviews and calculations. A case study of a planned residential area in Gränna, Jönköpings municipality, has been conducted and resulted in the gathering of empirical data.

    Findings: Geophysical, social, economic and legal factors must be taken into account when implementing sustainable stormwater management and in order to best prevent damage caused by floods of buildings and facilities.

    The application of sustainable stormwater solutions to delay and purify water is important where steep terrain leads to large stormwater flows, in order to reduce the risk of floods and the pollution levels in recipients caused by erosion. No single measure is sufficient to fully address the present risks, but by using a combination of open stormwater facilities and infiltration technologies, pollution levels in the drainage and flooding problems can be drastically reduced.

    Implications: The knowledge, and in some extent the will, among Swedish municipalities to implement sustainable stormwater management needs to be strengthened. In the case of construction of new residential areas in steep terrain, enclosed areas should not be exploited but instead be used as a designated area for excess of stormwater. Infiltration methods should be used in combination with open stormwater facilities to better handle the rain with varying recurrence and to reduce erosion damage.

    Limitations: The case study has served as a practical example and the calculations are not generally valid, although with some adjustments they can be applied in similar areas. The results of the literature review and interviews can be applied to residential areas in other Swedish municipalities where the terrains results in an increased water velocity.

    Keywords: Best management practice, erosion, infiltration, low impact development, steep terrain, stormwater pond, stormwater swale, sustainable stormwater management.

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