This study aimed at comparing the results obtained from the developed model, PRODREN, with those obtained from the DRAINMOD model thoroughly tested in the United States, and with the SIMDRENO model, as well as with methodologies traditionally used in dimensioning the agricultural drainage systems in areas of humid and sub-humid climates. Simulations for lowering the water table were accomplished by using these three models. The results from the drainage system design for maize crop, which was obtained by using the three models as well as by application of the traditional methodologies, were compared. The results from simulations of the water table and the economic design of the drainage systems accomplished with PRODREN were similar to those obtained by DRAINMOD and SIMDRENO models. The spacing among drains obtained by application of the PRODREN, SIMDRENO and DRAINMOD models based on water balance and economic analysis were considerably larger than those resulting from the employment of traditional methodologies.
simulation model; water table; economic analysis
