纽约市供水系统为900万人提供饮用水 城市及周边地区的消费者。这些水大部分来自近乎原始的地方 卡茨基尔和特拉华州系统的资源，但高达30%的资源由巴豆提供 系统380平方英里的巴顿河流域，首先向纽约供水 1842年的城市，毗邻城市，主要由住宅区和自然区组成。这个 纽约市环境保护局（NYCDEP）正在进行研究 巴豆水质量的当前和未来风险，以及寻求有效和高效 管理策略，以确保随着增长和 监管变得越来越严格。 一个工程顾问团队与NYCDEP合作开发了一个GIS- 基于风险 解决营养、固体、病原体和毒物损害的评估方法 来自陆地、化粪池和点源。该方法结合了数字分数 反映每个来源类别的风险、接近程度和严重程度，以生成总分。 评估结果用于创建总结当前风险的流域报告 水平和未来可能的趋势，而决策支持工具 该方法将用于评估替代管理方案。有了这个工具， NYCDEP将能够优先考虑其流域监测、建模、保护和管理 修复工作，以及为当地利益相关者提供 他们自己的分水岭计划。可能采用的流域策略类型 包括土地征用、雨水BMP、化粪池管理和智能开发。 本文讨论了巴豆流域对纽约的重要性 该城市的供水和供水系统提供了流域评估方法的概述。 本文介绍并解释了一份样本盆地报告，并对 包括基于GIS的决策支持工具。论文最后给出了一个结论 巴豆流域管理的预期未来方向总结。包括表格、数字。

The New York City Water Supply System provides drinking water for 9 million consumers in the city and surrounding areas. Most of this water comes from near-pristine sources in the Catskill and Delaware Systems, but up to 30% is supplied by the Croton System. The 380 square mile Croton Watershed, which first supplied water to New York City in 1842, adjoins the City and consists primarily of residential and natural areas. The New York City Department of Environmental Protection (NYCDEP) is researching current and future risks to Croton water quality and looking for effective and efficient management strategies to ensure source water protection as growth occurs and regulations become increasingly stringent. A team of engineering consultants worked with NYCDEP to develop a GIS-based risk assessment methodology that addresses nutrient, solids, pathogen, and toxics impairments from land-based, septic, and point sources. The methodology combines numerical scores reflecting risk, proximity, and severity for each source category to generate total scores. The assessment results are used to create Basin Reports which summarize current risk levels and possible future trends, while a decision support tool implementing the methodology will be used to evaluate alternative management scenarios. With this tool, NYCDEP will be able to prioritize its watershed monitoring, modeling, protection and restoration efforts as well as provide local stakeholders with technical information for their own watershed programs. The types of watershed strategies likely to be employed are land acquisition, stormwater BMPs, septics management, and smart development. This paper discusses the importance of the Croton Watershed to New York City's water supply and provides an overview of the watershed assessment methodology. A sample Basin Report is presented and explained, and a short demonstration of the GIS-based decision support tool is included. The paper concludes with a summary of expected future directions in the management of the Croton Watershed. Includes tables, figures.