This chapter demonstrates how ecological field work can serve as the basis for a strategy for soil protection. In 2019, the Municipal Parliament of the City of Kassel passed a resolution calling for climate neutrality in the city by 2030. The Parliament established an advisory board for climate protection and charged it with developing and evaluating strategies contributing to achieving this goal. The Board designed a bundle of measures for soil protection intended to help achieve a net-zero land-sealing rate: general measures, preventive soil protection, measures for greenfield development, measures for development in inner areas, and measures for restoration of sealed soils. Such nature-based solutions serve not only to mitigate and adapt to the detrimental consequences of climate change but also to strengthen public health and increase biodiversity. This strategy is centered on terrestrial ecosystems. However, essential to this strategy is the postulate to extend de-sealing from terrestrial soils to brooks: in Kassel, their streambeds and embankments are sealed by bricks and concrete elements on a scale of up to 95% of their total length. This considerable potential for de-sealing has been overlooked so far.