FIELD VALIDATION OF SWACROP IN ATLANTIC CANADA

Abstract

SWACROP, a soil-water balance and water table management model, was evaluated for Atlantic Canada by comparing the measured subsurface drain outflows and midspan water table depths against the simulated values for a two-year period. Field measurements were made during the summer months of 1990 and 1991 on nine test plots, covering three drainage treatments, consisting of 3, 6, and 12 m drain spacings, each with three replicates. The statistical parameters of average mean of differences, average absolute deviations, standard errors of estimate and standard deviations were calculated. In most cases, the predicted water table depths and drain outflows were close to the measured values, and for the most part, they followed the same trend. The average absolute deviation (A.D.) and standard error of estimate (S.E.) for water table depths ranged from 12.46 cm to 17.63 cm and from 16.81 cm to 22.48 cm, respectively, while the A.D. and S.E. for drain outflow rates varied from 0.11 cm/day to 0.25 cm/day and from 0....