A two-dimensional, cross-sectional, finitedifference, groundwater flow model and a simple application of Darcy's law were used to quantify groundwater flow (from a wetlands) beneath Levee 30 in Miami-Dade County, Florida. Geologic and geophysical data, vertical seepage data from the wetlands, canal discharge data, groundwater level data, and surface-water-stage data collected during 1995 and 1996 were used as boundary conditions and calibration data for the groundwater flow model and as input for the analytical model.