First posted June 1, 2022 For additional information, contact: Director,Pacific Islands Water Science CenterU.S. Geological SurveyInouye Regional Center1845 Wasp Blvd., B176Honolulu, HI 96818 groundwater recharge commonly is estimated using a threshold-type water-budget approach in which assumed to occur when water the plant-root zone exceeds soil’s moisture storage capacity. A budget of plant-...