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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

    Correspondence

     

     


    ABSTRACT

    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


     

    "Full text available in PDF"

     

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    Correspondence:
    +27 46 622-4014
    Fax: +27 46 622-9427
    E-mail: evison@iwr.ru.ac.za

    Received 16 October 2007
    Accepted in revised form 30 January 2008