There are various synonyms that can be used for the phrase "with enough forestation to preserve the run-off". These synonyms include "with adequate afforestation to protect the drainage", "with sufficient reforestation to retain the runoff", "with ample plantation to maintain the water flow", and "with abundant silviculture to conserve the precipitation". These synonyms all refer to the need for a significant amount of trees to be planted and maintained in order to protect the natural flow of water through a particular area. By preserving the runoff, we can help to prevent soil erosion, protect the ecological balance of the area, and provide a sustainable source of water for both humans and wildlife.