Retaining rainwater is a kind of nest egg, but how do we do it?

Retaining rainwater is a kind of nest egg but how

Rain, rain and more rain. The month of January can easily be called a wet month for the province of Utrecht. This is also apparent from measurements by the KNMI. On a map, almost the entire province turns blue. An excellent opportunity for the Water Boards to retain all that rain for as long as possible.

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