為改善阿公店水庫之淤積問題，南區水資源局於85年至94年間進行「阿公店水庫更新工程計畫」。計畫包含庫區之清淤及溢洪道的改建工作。水庫容量在清淤後為1,837萬立方公尺，而改變後的溢洪道則用來進行空庫防淤操作。為了解空庫防淤之效果，針對防淤操作期間之雨量、水位、入流量、出流量進行紀錄，並於空庫防淤期前後進行庫區地形之測量。目前成果如下：(1)防淤操作後年淤積量為20.48萬立方公尺/年，相較於更新前之41.55萬立方公尺/年已經降低約一半；(2)事件排砂效率受庫區水位影響甚大，根據分析成果建議防淤期間庫區水位應控制於30公尺以下，可大幅增加排砂效率。

Southern Region Water Resources Office, WRA, MOEA started a project to reduce the sedimentation in Agondian reservoir from 1996 to 2005. The project includes the dredging of the reservoir and reconstruction of spillway. The capacity reach 18.37 million cube meter after dredging. The empty flushing operation start with the reconstruction of spillway. To understand the effect of empty flushing, the rainfall, water level, inflow and outflow of the reservoir is recorded. On the other hand, the measure of the reservoir terrain was taken before and after the empty flushing operation every year. The result shows as follow, (1) the deposition rate decreased to 204.8 thousand million cube meter from 415.5 thousand million cube meter. (2) the effect is highly related with water level in the reservoir, under EL30m is suggested to increase the effect of empty flushing.