GLEAMS-Water Table (GLEAMS-WT) is a modified version of GLEAMS that ac
counts for shallow water table fluctuations. The modification was acco
mplished by replacing the evapotranspiration and percolation algorithm
s in GLEAMS with evapotranspiration and percolation routines that are
affected by shallow water table. Furthermore, routines to account for
depression storage, steady state upward flux from the water table, and
water table depth predictions were added. The simulation performances
of GLEAMS and GLEAMS-WT were evaluated by comparing their predictions
with seven years (1981 through 1987) of measured data from a runoff-e
rosion-drainage experimental plot at Baton Rouge, Louisiana. The GLEAM
S-WT predictions of surface runoff volume were very satisfactory. Tota
l predicted surface runoff volume for seven years was only 0.6 cm (0%)
greater than the observed runoff volume, a significant improvement fr
om GLEAMS underprediction of surface runoff volume by 54%. GLEAMS-WT p
redictions of water table depth were satisfactory.