A three parameter pseudo-linear reservoir model was developed and tested using data collected from urban catchments in Nottingham. Some 550 individual rainfall-runoff events, from ten different catchments, were recorded (from May 1983 to June 1985) and available for analysis. parameters, depression storage and runoff an effective hyetograph to be obtained from the The third parameter, KATCH, was a catchment obtained by an optimisation technique applied to Two- of the model coefficient, enabled measured hyetograph. constant which was development data sets. The rainfall loss parameters were determined using both the traditional method of linear regression analysis of rainfall-runoff depths, and by model optimisation of development data sets. Two versions of the pseudo-linear reservoir model were tested and results from both versions were compared with the results from the non-linear reservoir model, which is the overland flow routing model currently used in the Wallingford Procedure for the design and analysis of urban storm drainage in the United Kingdom. When the overall goodness-of-fit between simulated and observed hydrographs was assessed (using the Biassed Integral Square Error, BISE), similar model performance results were obtained for both versions of the pseudo-linear reservoir model and the non-linear reservoir model applied to paved surfaces. The pseudo-linear reservoir model accounted for the routing of flows, both on the surface and through the secondary drainage system, via the catchment constant, KATCH. For the two sub-catchments with secondary drains, the non-linear reservoir model over-estimated peak flows by some 401, since the model ignores routing through the drains. The pseudo-linear reservoir model gave consistently better results when compared with the non-linear reservoir model for storms monitored from an uncalibrated sub-catchment of mixed roof and paved surfaces. (
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:376095 |
| Date | January 1987 |
| Creators | Parkar, M. A. |
| Publisher | Nottingham Trent University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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