Abstract

Abstract Drainage discharges were measured in a sugarcane field in Tanzania. Field drainage consisted of an in-field system of shallow ditches intercepting drainage flow in the cane furrows ( row drainage ). Observed hydrographs are compared with discharge predictions of three relevant rainfall-discharge models, i.e. a linear storage model, a travelling time model (rational formula) and the curve number/synthetic unit hydrograph model of the U.S. Soil Conservation Service. Very good agreement is obtained with the linear storage model although, in this case, the linearity between discharge rate ( q ) and dynamic storage ( S ) appeared to be somewhat incidental, being promoted by the particular row drainage layout of the field.

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