圣地亚哥市正在发挥区域领导作用，保护其饮用水供应。这个 该市从位于旧金山五个不同集水区内的九座当地水库取水 迭戈县。该流域是水库的支流，分布在圣地亚哥市， 圣地亚哥县，几个小城市，部落土地和联邦土地，占地900多平方米 数英里的多样景观。几乎所有的流域土地都流入原水水库 位于城市边界之外，超出城市的管辖范围和控制土地使用的权限 规划、分区和建筑规范。尽管圣迭戈市水利局（SDWD） 在评估和评论其流域的新发展时，它几乎无法直接控制大部分地区 发生在城市边界之外的新发展。 到目前为止，该市一直试图 在“临时”的基础上影响流域开发，逐案解决每个项目 成功有限。迄今为止，流域土地基本上仍处于农村和未开发状态。 然而，随着圣地亚哥地区的发展，未来将有大量的住宅和公共设施 流域土地的商业开发和水质影响的可能性。这些 这些因素突出表明，需要更加重视水源保护。 为了提供一个框架，加强对饮用水库水质的保护 SDWD最近启动了一个项目，以制定“可持续发展的水源保护指南” 该指南将为城市径流制定水质控制措施 从流域内的新开发和每个水库的具体情况。 在制定指南的过程中，SDWD正在与该领域的其他机构密切合作 在现有规划、分区和建筑规范的基础上，对规划和土地使用拥有管辖权 法规和实践，并制定一个在以下情况下可行的统一框架: 现有的地方和地区项目。其中许多机构的代表都采取了行动 在制定指南方面发挥积极作用，在技术咨询委员会任职 定期召开会议，审查项目里程碑并提供意见。 本文重点讨论了发展水源保护的关键第一步 指导方针——在SDWD中建立可信的科学基础和资源保护需求 分水岭。包括参考资料、表格、图表。

The City of San Diego is taking a regional leadership role to protect its drinking water supplies. The City draws source water from nine local reservoirs, located within five different catchments in San Diego County. The watershed lands tributary to the reservoirs spread across the City of San Diego, San Diego County, several small cities, tribal lands, and federal lands, covering over 900 square miles of diverse landscapes. Nearly all of the watershed lands draining into the raw water reservoirs are located outside City boundaries, beyond the City's jurisdiction and authority to control land use planning, zoning, and building codes. Although the City of San Diego Water Department (SDWD) evaluates and comments on new developments in its watersheds, it has little direct control over most new developments which are occurring outside City boundaries. To date, the City has attempted to influence watershed development on an "ad hoc" basis, addressing each project case-by-case, with limited success. Thus far the watershed lands have remained largely rural and undeveloped. However, as the San Diego region grows the future holds the promise of extensive residential and commercial development in the watershed lands and the potential for water quality impacts. These factors highlight the need for greater focus on source water protection. To provide a framework for stronger protection of water quality in its drinking water reservoirs, the SDWD has recently embarked on a project to establish "Source Water Protection Guidelines for New Development". The Guidelines will establish water quality control measures for urban runoff from new development within the watersheds and specific to each of the reservoirs. In developing the Guidelines, the SDWD is working closely with the other agencies in the area that have jurisdiction over planning and land use to build on existing planning, zoning, and building code regulations and practices and to develop a uniform framework that is workable within the context of existing local and regional programs. Representatives from many of these agencies have taken an active role in the development of the Guidelines, serving on a Technical Advisory Committee that meets regularly to review project milestones and provide input. This paper focuses on the critical first step toward developing the Source Water Protection Guidelines - establishing a credible scientific basis and need for source protection in the SDWD watersheds. Includes reference, tables, figures.