The CE-THERM-R1 model was used to simulate the depths of mixing and frequencies of short-term, non-seasonal hydrodynamic behaviors for a small (1.5 ha) pond in western South Carolina. Two years of data were used to calibrate the system coefficients and to assess the adequacy of the simulations. Mixing depths and frequencies were then used to assess the effects of nonseasonal allogenic forces on the planktonic succession and distribution. The results demonstrate that the intensities and frequencies of allogenic forces are directly related to the plankton periodicity and the development and persistence of accumulations of organisms and particulate material. The calibrated model is now being tested for predictions of system responses to real-time meteorological data collected from a local meteorological tower.