Structurally, the WASP program includes six mechanisms for describing transport. These fields consist of advection and dispersion in the water column; advection and dispersion in pore water; settling, resuspension, and sedimentation of up to three classes of solids; and evaporation or precipitation. To describe advection within WASP, each inflow or circulation have the same general data requirements dealing with water body hydrogeometry, advective and dispersive flows, settling and resuspension rates, boundary concentrations, pollutant loadings, and initial conditions. The body of water to be simulated must be divided into a series of computational elements or segments. Segment volumes, connectivity, and type (surface water, subsurface water, surface benthic, subsurface benthic) must be specified