近30年来，圣安东尼奥一直在实施交叉连接控制和 南方大学建立的防回流措施 加利福尼亚交叉连接控制与水力学研究的基础 美国水务工程协会的M-14交叉连接控制手册和本地 管道规范。有许多记录在案的回流事件 使用设备和工艺涉及许多不同的水域。号码和 圣安东尼奥记录在案的事件的严重性由于以下原因稳步下降: 部分原因是严格执行交叉连接计划。在过去的几年里 多年来，圣安东尼奥供水系统（SAWS）已经设计、开始施工并投入使用 满足了我们对循环水的第一个客户承诺，这将有助于 缓解未来的水资源问题。一条大型输水干管将环绕城市，并 为灌溉、工业加工和特殊用水提供用水 设备 由于标准尺寸，服务通常为4英寸或更大 我们的循环利用客户的需求。与任何交叉连接控制措施一样， 防止回流是循环水的持续工作，并已启动 在向客户提供供水服务之前。锯子倒流 预防科和圣安东尼奥管道检查部门负责 确保饮用水供应与正在进行的工艺分离 提供循环水。本文讨论了一些政策和措施 为防止循环水交叉连接而制定的程序 在圣安东尼奥。

For almost thirty years, San Antonio has enforced cross connection control and backflow prevention measures as established by the University of Southern California's Foundation of Cross Connection Control and Hydraulic Research, American Water Works Association's M-14 Cross Connection Control Manual and local plumbing codes. There have been a number of documented backflow incidents that have involved many different waters using equipment and processes. The number and severity of documented incidents in San Antonio have steadily decreased due in part to stringent enforcement of the cross connection program. In the last few years, the San Antonio Water System (SAWS) has designed, started construction and met our first customer commitment for Recycle Water which will assist in relieving future water concerns. A large water main will encircle the city and provide water for irrigation, industrial processes and special water using equipment. The services will generally be 4" and larger due to the typical size of our recycle customer needs. As with any cross connection control measures, backflow prevention is a continuous effort with recycle water and is initiated prior to water service being provided to the customer. The SAWS Backflow Prevention Section and the San Antonio Plumbing Inspection Department are charged with assuring separation of the potable water supply from processes being provided with recycle water. This paper discusses some of the policies and procedures that have been established to prevent recycle water cross connections in San Antonio.