Author(s): A. R. Rao; Ji Han

Linked Author(s):

Keywords: No Keywords

Abstract: An index of agreement between observed and calculated hydrographs or an objectivefunction is needed to estimate the parameters of urban rainfall-runoff models.Theselection of objective functions,to a certain extent,depends on the prablem underconsideration.For example,for the design of detention storage facilities,the objectivefunction must emphasize the total runoff volume under the hydrograph.For theproblem of sizing drainage system pipes,it is better to define an objective functionwhich emphasizes the peak flows and the shape of design hydrographs.In the overallinvestigation of a drainage system,an objective function which has two components,emphasizing both the shape and the volume of hydrographs,may be suitable.Therefore,selection of an objective function for the optimal parameter estimation ofurban rainfall-runoff models is,to a certain extent,subjective.The choice of theobjective function,however,affects the optimal parameter estimates of the model.Theparameter estimates are obviously optimal only with respect to the objective functionused for optimization.Few investigations have dealt with the problem of selection ofobjective functions which are used with the rainfall-runoff models.Those who haveinvestigated the problem have often used,only simple rainfall-runoff models.Consequently,the basic objective of the research discussed in this paper is to investigateseveral objective functions using an urban rainfall-runoff model and to arrive at someconclusions about them.

DOI:

Year: 1987