農業用水移用可能補償金額訂定之研究－－以桃竹苗地區為例

Estimating the Potential Water Transfer Price in Northern Taiwan Regions

本文之主要研究目的為利用數學規劃方法來建構水資源移用補償模型，並以用水需求較迫切之桃竹苗地區為研究對象，根據民國90 年桃竹苗地區的水資源供需資料，探討農業用水移用對桃竹苗地區的水資源經濟影響衝擊及移用補償合理金額之訂定。實證結果顯示不同地區應有不同的移用補償金額，主要是因為各個地區不同的用水需求導致不同之水資源的移轉價格，因而補償的金額亦會不同。新竹地區的補償金額比其他地區高的主要是因為此地區的工業用水需求較高所致。為公平合理考量，未來農業用水的移用補償宜考量不同地區產業結構與需水標的差異，隨著不同區域有不同的補償金額。另外，研究結果亦顯示桃竹苗地區的每公頃補償金額會隨著休耕面積的增加而上升，此反映出大規模水資源移轉時的每公頃補償金額會愈高，亦即用水需求愈強時須付出愈高的金額來獲得水資源的供應。最後，當農業用水移用因休耕面積增加而增加時，水資源移用市場為完全競爭下的福利增加幅度均超過獨佔市場下的福利增加幅度，此顯示若透過政府的干預使得水資源移用市場更趨向完全競爭市場時將可增加社會福利。

The purpose of this paper is to estimate the potential market price forwater transferring among sectors in the Northern Taiwan region. Thisregion is the major semi-conduct and information technology productsarea in Taiwan which plays an important role to contribute domestic GDP.To do so, a regional water endogenous price economic model using anon-linear programming approach is adopted and built where the watertransfer activity from agricultural sector to non-agricultural sector in awater market is taken into the consideration in this model. Later, thepotential water transferring price is estimated through this empiricalmodel under the assumption of social welfare maximization. Thesimulation results proved that the occurrence of water transferring activityfrom agricultural sector to non-agricultural sector could improve thebenefit both in the water market and the agricultural sector.