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Water SA

versión On-line ISSN 1816-7950
versión impresa ISSN 0378-4738

Water SA vol.34 no.2 Pretoria feb. 2008


Towards revised physically based parameter estimation methods for the Pitman monthly rainfall-runoff model



Evison Kapangaziwiri; Denis A Hughes

Institute for Water Research, Rhodes University, PO Box 94, Grahamstown 6140, South Africa





This paper presents a preliminary stage in the development of an alternative parameterisation procedure for the Pitman monthly rainfall runoff model which enjoys popular use in water resource assessment in Southern Africa. The estimation procedures are based on the premise that it is possible to use physical basin properties directly in the quantification of the soil moisture accounting, runoff, and recharge and infiltration parameters. The results for selected basins show that the revised parameters are at least as good as current regionalised sets or give satisfactory results in areas where no regionalised parameters exist.

Keywords: hydrological modelling, Southern Africa, parameters, regionalisation, uncertainty


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Received 16 October 2007
Accepted in revised form 30 January 2008