缓洪 meaning in English

flood alleviation
floodalleviation

Forests as an adjuster for ecological balance in mountain areas play important roles in soil and water conservation , runoff and silt retardance etc . especially , forests are regarded as " forest reservoir " due to their great hydrological regulation functions through canopy , undergrowth , litterfall and soil layers
森林是山地生态平衡的重要调节器，特别是其水源涵养、理水保土、缓洪滞淤的功能对于山地面积大的福建省显得极为重要。森林通过林冠层、林下植被层、枯枝落叶层以及土壤层发挥良好的涵养水源、保持水土、削峰滞洪等“森林水库”的功能。