UnSat Suite Plus

The HELP model is a finite difference model used to evaluate the hydrologic performance of landfills containing multiple layers and different layer combinations. The model is used to predict the seasonal generation, percolation and drainage of landfill leachate due to precipitation and infiltration. The Visual HELP interface is only included as part of the WHI UnSat Suite Plus, or as a stand-alone application.

Model Details

• Multi-layer profile
• Heterogeneous soil properties
• Transient atmospheric boundary condition data
• International weather generator (3,000 weather stations globally)
• Includes a limited database of soil properties

Simulated Processes

• Transient groundwater flow through a one-dimensional soil column

Simulation Results

The hydrological results generated by the HELP model include the following time-series data:

• Precipitation, evapotranspiration and surface runoff
• Lateral drainage from selected model layers
• Percolation/Leakage through selected model layers
• Average head values for select model layers