Fitness tool groundwater withdrawals fresh water Zeeland

After publication of FRESHEM Zeeland in 2017, an increase in the number of groundwater abstractions in Zeeland has been observed. FRESHEM, on the other hand, only provides insight into the presence of freshwater lenses, and no direct information on the degree of suitability of groundwater abstractions. A GIS analysis in which FRESHEM, GeoTOP and relative infiltration has been developed and results in a fitness tool for groundwater abstractions. Separate suitability factors have been established for each dataset. The suitability factor is calculated for each cell (50x50 meters) per 0.5 meter in the subsurface by multiplying the individual factors by a weight. For FRESHEM, GeoTOP and relative infiltration, the weights are 0.5, 0.4 and 0.1 respectively. The sum results in the suitability factor for groundwater abstraction. The purpose of the fitness tool is to develop a tool in which availability of fresh water is linked to factors affecting the abstraction of this water. The following factors have been used: 1. FRESHEM Zeeland: The three-dimensional distribution of the chloride concentration of groundwater with a horizontal resolution of 50*50 m² and a vertical resolution of 0.5 m. 2. GeoTOP: The three-dimensional distribution of lithology with a horizontal resolution of 100*100 m² and a vertical resolution of 0.5 m. 3. Infiltration. Grid with relative value sweet bubble formation, based on a dependency of distance from the coast, ground level height and coating thickness