圣安东尼奥供水系统（SAWS）是德克萨斯州圣安东尼奥市的一家城市公用事业公司，拥有300000个连接点，服务于1000000名客户。SAWS保护项目是一个非常全面的项目，除了农业、学校教育和系统项目外，重点关注商业和住宅用水的减少。环保部一直在审查当前和即将实施的节水计划、节水成本和总预算。尽管许多员工多年来一直参与水资源保护领域，但发现员工出于评估目的做出了各种假设。因此，这一过程中的主要挑战是定义用于估算每个项目潜在节水量的公式和假设。 然而，在规划师的讨论中，很明显，其中一些公式比其他公式的精确度更高。例如，超低冲水马桶（ULFT）公式被认为是准确的，而节水器景观回扣评估公式被认为需要更多研究。对公共教育活动和课程的审查，往往很难根据每英亩英尺节省的成本进行评估，结果形成了一个排名系统或“目标影响”系统。包括桌子。

The San Antonio Water System (SAWS) is a city owned utility in San Antonio, Texas with 300,000 connections serving 1,000,000 customers. The SAWS conservation program is a very comprehensive program focusing on both commercial and residential end use reductions in water, in addition to agricultural, school education and system programs. The Conservation Department has been reviewing current and imminent programs in terms of water savings, cost for water saved and general budget. Though much of the staff has been involved in the water conservation field for years it was found that there were a variety of assumptions made by staff for the purposes of evaluation. As such the primary challenge in this process has been to define formulas and assumptions used to estimate the potential water savings for each program. However, during planner discussions it became clear that some of these formulas have a greater confidence level for accuracy than others. For example, the ultra-low-flush toilet (ULFT) formulas are thought to be accurate where as the Watersaver Landscape Rebate evaluation formula is thought to need more study. A review of public education events and classes, often difficult to evaluate in terms of cost per acre feet saved, resulted in the development of a ranking system or "Target Impact" system. Includes tables.