Rainfall-runoff modelling in gauged and ungauged urban catchments using Urban Stormwater Model (USwM)

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dc.contributor.authorChoong, Wee Kang
dc.date.accessioned2014-11-03T02:12:02Z
dc.date.available2014-11-03T02:12:02Z
dc.date.issued2009
dc.descriptionPhDen_US
dc.description.abstractThis research was carried out to enhance the stormwater modelling efficiency in terms of model maintainability and improvement in ability for runoff prediction in urban catchments. The work included rainfall-runoff analysis, site infiltration tests, redevelopment of Urban Stormwater Model (USwM) and, finally model simulation using USwM. Two urban catchments were used, the Sg. Kayu Ara for model calibration and validation and, Sg. Kerayong catchment for runoff prediction. The rainfall-runoff relationship for the Sg. Kayu Ara catchment was established as a linear equation, Runoff = 0.60 x Rainfall – 2.83, based on 104 rainfall events. The 60% urban area and average catchment depression storage of 2.83mm indicated by the established equation was found consistent with the information extracted from land use map. The results of infiltration tests showed that infiltration rates vary greatly on sandy soil. The fitted Horton parameter values were 210 and 18mm/hr for initial and final infiltration rate and 0.1955/minute for decay constant. Analysis of variance indicated no significant difference between mean of fitted Horton parameters for dry and wet sandy soil and, for the soil types of loamy sand and sand. Object-oriented Urban Stormwater Model (USwM) was redeveloped using Visual C++ as the programming language. The work removed snow and water quality components, two evaporation input options and one optional input in Horton method. USwM was calibrated and validated in Sg. Kayu Ara catchment using the formulated generic stormwater modelling procedures with the observed records used as simulation target. The coefficients of determination (R²) from distributed modelling were 0.83 and 0.90 for peak discharge and runoff volume. For runoff prediction at Sg. Kerayong catchment, the R² of 0.72 for peak water level was obtained. The research goal has been achieved with enhanced model maintainability using object-oriented technology and improved ability for runoff prediction through the formulated generic stormwater modelling procedure.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/229
dc.language.isoenen_US
dc.subjectCivil Engineeringen_US
dc.subjectRainfall-runoffen_US
dc.subjectUrban Stormwater Modelen_US
dc.titleRainfall-runoff modelling in gauged and ungauged urban catchments using Urban Stormwater Model (USwM)en_US
dc.typeThesisen_US
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