The simulation program ODIT 2.0 enables the simulation of one-dimensional solute transport along the impact pathway: input source (e.g., agricultural land) → soil water → groundwater → water abstraction well (water intake) or receptor (protected asset), using an analytical solution for solute transport that has been significantly further developed on the basis of ODIT.
The simulation program ODIT 2.0 enables the simulation of one-dimensional solute transport along the impact pathway: input source (e.g., agricultural land) → soil water → groundwater → water abstraction (water intake) or receptor (protected asset), using an analytical solution for solute transport that has been significantly further developed on the basis of ODIT.
In conjunction with the denitrification and microbial degradation rates determined in accordance with LABMIG, the results allow a robust forecast of the spreading of contaminants/solutes in the soil and groundwater zone in accordance with the German Federal Soil Protection and Contaminated Sites Ordinance (BBodSchV) and the Drinking Water Catchment Areas Ordinance (Trinkwassereinzugsgebietsverordnung). This also applies to trace substances, irrespective of the Darcy hydraulic conductivity coefficient (kf value). On this basis, authorities can make decisions regarding a spatial and temporal risk assessment of groundwater abstraction facilities as a result of diffuse (areal) inputs of substances—e.g., by specifying permissible values for land management in order to achieve target values for the affected receptor/protected object (such as a groundwater abstraction well). Further applications include:
- scenario/variant analysis for land management, groundwater flow velocities, and transport parameters (e.g., degradation rates) in groundwater,
- determination of response times: changes in the cause → effect at the location of assessment (e.g., a groundwater abstraction well), and
- plausibility checking/validation of numerical models for simulating solute transport in the soil and groundwater zone.
