You might have heard of seepage (kwel) before. It is deepergroundwater that is pushed into the upper layer of the soil and forms sources (bronnen) or swamps. Seepage is often present on places that lie very low in the landscape or on places with an abrupt change in elevation.
Here the Wageningse berg suddenly drops into the floodplains. This is why on some places in the floodplains, seepage is present. It is often recognized by high pH and a higher presence of minerals like iron and calcium. When seepage does not reach close to the surface, it is called groundwater, but it can still have these characteristics.
Now that you know this, try answering the next question!