影えい響きょう半はん径けい

noun

radius of influence

Technical term used in fields such as hydrology, civil engineering, and environmental science to describe the distance over which an effect (e.g., drawdown from a well) is felt.

• この井い戸どの影えい響きょう半はん径けいは約やく500メートルと推すい定ていされている。

  The radius of influence of this well is estimated to be about 500 meters.