The aim of this research is to give more understanding in the effects of the Meuse surface water level change due to the crash on Thursday 29th of December 2016, near Grave. Numerous studies have carried out the impact of the surface water level change due to the crash but to date no studies have used a new developed groundwater model of waterboard Aa & Maas. For the groundwater model to be used in any type of predictive role. This research focused on the optimal determination of certain geo-hydrological parameters to compute the calculated heads until it matches field-observed values within an acceptable level of accuracy. After optimization, the surrounding effects of the crash are validated with the new groundwater model.
Results show that: the new groundwater model is often able to match field-observed values far away from the riverbed. Closer to the river, 60\% of the calculated ground heads are calculated above observed heads, with a dynamic difference of -0.10 to 0.10m. The hydraulic conductivity determines small differences between field-observed and model calculations but show good fluctuation over time. Furthermore, optimization of the conductance showed a spatial difference in groundwater responds towards +0.10 - +0.25m. The results of the surrounding effects showed that groundwater variations are mostly visible in a range of 2 kilometers near the riverbed while influenced by an extreme low surface water level. Close to the riverbed, variations of circa two meter where visible. The spatial variability of the groundwater heads becomes significantly less far away from the river.
Therefore, it can be concluded that the event on 29th of December does have minor influences on the surrounding groundwater head and it is necessary to keep in mind that the current conductance need to be improved. As for water management, this provides that an extreme low surface water level in the Meuse have only significant effect on groundwater levels near the riverbed.