Vomb Trough Water Resources groundwater assessment, Vomb Trough, southern Sweden; 16 new observation wells installed

Vomb Trough Water Resources Ankita Prayag, PhD student, Lund University, ankita.prayag@tg.lth.se Kristofer Hägg, Research leader, Sydvatten, kristofer.hagg@sydvatten.se Peter Dahlqvist, Senior Geologist, SGU, peter.dahlqvist@sgu.se Policy day, Brussels, 19-21 May 2026

Challenges Water resources in southern Sweden • Decreased water levels in lakes • Low groundwater levels • Brownification • Nutrient loads

  1. Groundwater resources assessment within the Trough

  2. Monitoring of the seasonal variations of Wetlands

  3. Monitoring and assessment of an infiltration pond at Vomb WW Pilot Goals

  4. Hydrogeological model for the Vomb Trough

  5. Wetland investigation

  6. Monitoring Vomb WW Scale Pilot Scales

• Existing wells used for extraction data • Monitoring network is insufficient, thus, • 16 new observation wells installed for model calibration • Detailed aquifer delineation Pilot Achievements- Vomb Trough

• NW-SE cross-section based on SkyTEM data showing resistivities and elevation. • Before detailed interpretation, the initial conceptual model is prepared for aquifer grouping. • Groundwater is present in both the soil layers and bedrock aquifers. NW SE Pilot Achievements- Vomb Trough

• 7 observation wells around the Wetland – measurement of changes in the GW-level • DCIP surveys of time steps to assess changes in subsurface moisture and resistivity– Ground level rises T0 T1 T0 Pilot Achievements- Wetland

Full water spread and water saturation in depth Resistivity ratios T0 is baseline and T1, T2… later timesteps 1. Integrated Hydrogeophysical monitoring reveals infiltration pathways, clogging-mounding effects dominated by inflow rates and soil layers. 2. Strengthened knowledge and refined strategies of pond management. 3. Adapted monitoring instrumentation for better performance for future planned ponds. Pilot Achievements

  • Vomb Pond Direct Current Resistivity and Induced Polarisation (DCIP) monitoring system Installation Photo credits: Torleif Dahlin

Stakeholder involvement Vomb Trough Municipalities and decision makers Vomb Pond Field visit for project partners

Future Projects • MAR Optimization research, including lab measurements • Climate & Blue Transition: Supply management + nature-based solutions • 3D Groundwater Model: Predictive model with climate scenarios • Wetland–Aquifer Study: Long-term monitoring

Thank you for your attention! Questions, please?