为了确保纽约市饮用水供应的持续高质量，该市制定了一项综合性的长期流域保护计划。该项目于1989年启动，为一系列免除地表水处理规则的过滤要求提供了基础。本文简要讨论了该计划以及评估其短期和长期有效性的挑战。包括数字。

To ensure the continued high quality of New York City's drinking water supply, the City developeda comprehensive long-term watershed protection program. Initiated in 1989, this program has provided the basis for a series of waivers from the filtration requirements of the SurfaceWater Treatment Rule. This paper briefly discusses the program and the challenge of assessing both its short- and long-term effectiveness. Includes figure.