die Trocknung
drying
The process in which something is dried or dries, meaning moisture is removed.
Die Trocknung der frisch gestrichenen Wand dauert mehrere Stunden.
The drying of the freshly painted wall takes several hours.

drying
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drying
The process in which something is dried or dries, meaning moisture is removed.
Die Trocknung der frisch gestrichenen Wand dauert mehrere Stunden.
The drying of the freshly painted wall takes several hours.

The noun 'Trocknung' (drying) is derived from the verb 'trocknen' (to dry). The ending '-ung' turns a verb into a noun that describes the process or result of the action. This pattern is very common in German, e.g. 'prüfen' (to check / examine) → 'die Prüfung' (the exam / inspection).
Die Trocknung der Wäsche an der frischen Luft ist umweltfreundlich.
Drying laundry in the fresh air is environmentally friendly.
To indicate what is being dried, German usually uses the preposition 'von' followed by the dative. This construction is typical for process nouns ending in '-ung'.
Die Trocknung von Früchten konserviert sie für den Winter.
The drying of fruit preserves it for the winter.
Common adjectives that describe the process are 'schnelle' (fast), 'langsame' (slow), 'natürliche' (natural), or 'künstliche' (artificial) drying. Typical verbs are 'dauern' (to take / last) or 'beschleunigen' (to speed up).
Eine schonende Trocknung bei niedriger Temperatur erhält die Nährstoffe.
Gentle drying at a low temperature preserves the nutrients.
drainage / fluid removal
'Entwässerung' and 'Trocknung' both have to do with removing water or moisture. 'Entwässerung' is used when water is deliberately drained away, for example from soil, a basement, or an area. In medicine, it can also refer to removing too much fluid from the body. 'Trocknung' more generally means the process in which something becomes dry or is made dry, for example clothing, wood, or paint. The words can be confused because in both cases there is less water in the end. When water flows away or is technically drained, 'Entwässerung' fits. When something loses its moisture, 'Trocknung' fits.

Vor dem Wochenende muss die Trocknung der frisch gestrichenen Wände fertig sein.
The freshly painted walls have to finish drying before the weekend.
Nach dem starken Regen plant die Stadt eine bessere Entwässerung des Parks.
After the heavy rain, the city is planning better drainage for the park.