Description
The quantitative sensitivity is defined as the product of the sojourn time of groundwater at the infiltration rate. When a water particle stays under the ground for two times longer, it is twice as important for the water quality in an aquifer. The same applies to the infiltration rate. If an area infiltrates twice as much as in another area (and the period of residence is the same), the area is twice more important for the overall groundwater quality. The map therefore indicates which areas are important for the ‘overall water quality’, only taking into account conservative transport, and thus without taking into account degradation and retardation. Understanding the quantitative sensitivity is important, because the main characteristic of groundwater systems is that most of them are shallow and short in the subsoil, and a very small part of an area largely determines the deeper water quality. On the map, the quantitative sensitivity is displayed on a logarithmic scale. For the municipality of Vijfheerenlanden, which has been part of the province of Utrecht since 1 January 2019, no data is yet available.
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