Investigating the performance of WSUD assets in relation to design, construction and maintenance practices

Matamala, M and Jayasuriya, N 2015, 'Investigating the performance of WSUD assets in relation to design, construction and maintenance practices', in Proceedings of the 9th International Water Sensitive Urban Design (WSUD 2015), Sydney, Australia, 19 - 23 October 2015, pp. 320-329.


Document type: Conference Paper
Collection: Conference Papers

Title Investigating the performance of WSUD assets in relation to design, construction and maintenance practices
Author(s) Matamala, M
Jayasuriya, N
Year 2015
Conference name WSUD 2015
Conference location Sydney, Australia
Conference dates 19 - 23 October 2015
Proceedings title Proceedings of the 9th International Water Sensitive Urban Design (WSUD 2015)
Publisher Engineers Australia
Place of publication Australia
Start page 320
End page 329
Total pages 10
Abstract The design of WSUD assets remains an important component in its implementation process, being further supported by MUSIC which sizes measures to meet the target pollutant removals. In many cases however the construction and maintenance of WSUD assets are overlooked resulting in poorer performances. This paper highlights the importance of considering all design, construction and maintenance procedures by relating it to the performance results of a stormwater harvesting system. The method used to investigate both hydraulic and treatment performances also provide a valid approach to outlining issues relevant to asset owners. The investigation mainly focused on the raingarden and involved thorough visual inspections, inlet and outlet sample collections, the water quality analysis of samples collected, an estimate of the inflow and outflow and in-situ hydraulic conductivity measurements of the filter media. An investigation of the overall treatment system was also conducted where the performance was evaluated with considerations to the ecological and social benefits being attained. Although the system is a fairly new development, the investigation results indicated poor treatment and hydraulic performances of the raingarden. Visual inspections illustrated the presence of irregularities including: (1) extensive soil particle size variability on the filter media surface, (2) failing vegetation consisting of predominantly weeds and dried plants, (3) erosion on surrounding banks with sediment deposits on the raingarden surface as well as other concerns. The in-situ hydraulic conductivity measurements and water quality results disclosed: (1) infiltration rate variations, (2) insufficient retention of pollutants, (3) the existence of preferential flow paths and (4) the release of silt/clay particles from surrounding sources. Whilst these performance issues were identified, the water quality analysis of samples collected from different points within the overall system, including the open channel, sediment basin, open lake and advanced treatment shed complied with design specifications and recommended guidelines. The system provides acceptable water quality for use on public open spaces where the open lake added ecological and social value to the reserve. Further investigations and the application of certain maintenance practices could however ensure its longevity.
Subjects Water Resources Engineering
Water Quality Engineering
Keyword(s) Construction and Maintenance
Raingardens
Water Sensitive Urban Design
ISBN 9781922107671
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