Groundwater flow in the Leon-Chinandega aquifer in Nicaragua was studied using numerical models. The researchers focused on how groundwater pumping for irrigation affects the aquifer and river discharge. They found that pumping reduces river flow, especially during dry periods when irrigation demand is high. The models showed that the aquifer responds to changes within about a year, allowing for short-term management strategies. This study suggests that using numerical models can help manage water resources in the region, especially with increasing agricultural development.