桃園市自來水普及率已達至96.82%的人口數；然而偏遠地區可能因施工不便仍使用天然水源。由於過度發達的經濟活動和極端的氣候變化，天然水源受到污染的可能性有所增加，本研究的目的是使用層級分析法（AHP）建立無自來水地區延管工程補助評選模式，在文獻探討中概述了影響中央政府補助自來水公司管線擴建優先順序和決策的6個構面及15個準則，並針對8名政府官員試點的研究結果一致性指數（CI）為0.070小於0.1，符合AHP問卷的可行性。在正式的AHP問卷調查針對30名工作經驗大多超過6年的政府官員，CI結果為CI=0.062，CR=0.050均小於0.1，因此構面排序結果為（1）用水來源>交期>人口>住宅型態>政治>技術；（2）各方面的準則排序。本研究採用26個實證案例對排序結果進行評估，以檢驗結果能否最終獲得中央政府的核定。其中除了前三種個案需花費較高額工程經費以外，其評比通過率相較於歷年高出約60%，而這項發現可以有效的改善與實踐，以節省時間和人力。;The coverage of tap water utilities in Taoyuan city has reached 96.82% of the population; however, the remote areas may take advantage of natural water by inconvenient constructability. The probability of contaminated natural water has increased due to overdeveloped economical activities and extreme climate changes. The objective of this study is to establish the preference ranking model for extension of tap water utilities using Analytic Hierarchy Process (AHP). The literature review outlines 6 aspects and 15 factors that affect the priority and decision for pipe extension of tap water utilities. The pilot study aiming at 8 officials has the result with Consistency Index (CI) 0.070 less than 0.1, supporting feasibility of the AHP questionnaire. The formal AHP question survey which aims at 30 officials with working experience mostly greater than 6 years has the CI result of CI = 0.062 and CR 0.050 both less than 0.1. The priority is established to: (1) Aspects: water source > construction period > population > residential type > political matter > constructability; (2) factor preference rankings for each aspect. The result is evaluated using 26 empirical cases to examine if the result can be finally approved by the central government. Except for costly construction in top three cases, the acceptance rate is around 60% higher than before. The finding can improve the practice in an efficient way to save time and manpower.
