abstract = "This study used Genetic Programming to establish a
modular model consisting of two sub-models: (i) a
baseflow module and (ii) a quickflow module to simulate
the two hydrograph flow components. The relationship
between the input variables in the model (i.e.
meteorological data and catchment initial conditions)
and its overall structure can be explained in terms of
catchment hydrological processes. Therefore, the model
is a partial greying of what is often a black-box
approach in catchment modelling. Subsequently, this
study used the modular model to predict both flow
components of events as well as time series, and
applied optimization techniques to estimate the
contributions of various land uses (i.e. impervious,
steep grassland, grassland on mild slope, mixed grasses
and trees and relatively natural vegetation) towards
baseflow and quickflow in tropical urban systems. This
quantification facilitates the integration of water
sensitive urban infrastructure for the sustainable
development of water in tropical megacities.",