Journal article

A general model for the exact computation of yield from a rainwater tank

John Mashford, Shiroma Maheepala



The models presented in the literature for the computation by simulation of yield from a rainwater tank are either incorrect or approximate at best. In this paper a general, exact, continuous time model of the operation of rainwater tanks is presented. The operation of a tank is determined by the rainfall runoff and demand distribution functions and the capacity of the tank. The runoff and demand distributions are assumed to satisfy certain reasonable conditions which are satisfied in all cases of practical interest, e.g. when the distributions are described by piecewise constant functions. The yield, spill and volume functions are characterized by equations which, by means of a constructive..

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University of Melbourne Researchers


Funding Acknowledgements

This research was funded by the Urban Water Security Research Alliance ( which is a partnership between the Queensland State Government, Griffith University, the University of Queensland and CSIRO (Commonwealth Scientific and Industrial Research Organization)'s Water for a Healthy Country Research Flagship. The authors would like to thank Mike Rahilly, Esther Coultas, Luis Neumann, Fareed Mirza and Magnus Moglia for very helpful discussions. The authors would also like to thank the anonymous reviewer for very helpful comments.