GEOPHYSICAL SURVEY AS A TOOL TO REVEAL SUBSURFACE STRATIFICATION AT A SMALL AGRICULTURAL HEADWATER CATCHMENT: A CASE STUDY

Catchment drainage area is a basic spatial unit in landscape hydrology within which the authorities estimate water balance and manage resources. The catchment commonly delineated based on surface topography, determined using digital elevation model. Therefore, only flow over implicitly considered. However, substantial portion of rainfall infiltrates percolates through soil profile to groundwater, where geological structures control instead topography surface. discrepancy between topography-based bedrock-based can cause large discrepancies calculation. It this paper we present an investigation subsurface media stratification headwater central part Czech Republic geophysical survey method - electrical resistivity tomography (ERT). Results indicate that complexity layers cannot be estimated solely from land topography. Although shallow copy shape surface, deeper do not. This finding has strong implication transport regime since it suggests deep may follow different pathways other directions then or structures.