Niederschlagsbewirtschaftung

Could you please confirm the exact term? The fragment "Niederschlagsb..." could refer to several concepts (for example, Niederschlagsbasis, Niederschlagsbilanz, Niederschlagsbildung, etc.). If you specify the intended term or the context (meteorology, hydrology, climate history), I’ll write a concise, neutral wiki-style article under 300 words.