平衡水处理工艺，以充分应对微生物污染物的直接威胁和消毒副产品的长期健康影响，是协商消毒副产品（DBP）规则第二阶段和LT2ESWTR的利益相关者面临的主要挑战。为了利用作为信息收集规则一部分收集的大量数据，支持利益相关者的技术工作组（TWG）开发了一个名为地表水分析工具（SWAT）的计算机程序。该项目利用信息收集规则（ICR）数据库中的可用数据，确定每个受试工厂达到合规标准所需的处理工艺改进水平。一旦对所有受试工厂进行了这项工作，将结果汇总，以确定必要的工艺改进的分布（即:。 e、 符合性预测）以满足给定的符合性标准。该计算机程序允许对美国的大型供水系统进行评估，并有助于估计在制定拟议规则期间，为实现符合各种监管替代方案所需的工艺改进水平。在规划水处理工艺改进时，工程师通常会实践SWAT计划中使用的概念。将该计划用作规划工具，可以（通过WTP模拟模型所做的预测）对规划方案的消毒和DBP合规性进行定量评估。本文对该工具进行了描述，并举例说明了如何在规划中使用该工具。包括数字。

Balancing water treatment processes to adequately deal with the immediate threat from microbiological contaminants and the long term health effects of disinfection byproducts was the major challenge faced by the group of stakeholders who negotiated the second stage of the Disinfection Byproducts (DBP) rule and the LT2ESWTR. In order to take advantage of the vast amount of data collected as a part of the Information Collection Rule, the technical working group (TWG) supporting the stakeholders developed a computer program termed Surface Water Analytical Tool (SWAT). This program utilized the data available from the Information Collection Rule (ICR) database to determine the level of treatment process improvement necessary for each subjected plant to achieve the compliance criteria. Once this was done for all the subjected plants, the results were aggregated to determine the distribution of process improvements necessary (i.e. a compliance forecast) for a given compliance criteria. This computer program allowed the evaluation of the large water systems in the US and helped estimate the level of process improvement necessary for achieving compliance with various regulatory alternatives that were considered during the development of the proposed rule. In planning water treatment process improvements, engineers typically practice the concept used in the SWAT program. Use of this program as a planning tool allows a quantitative assessment (through the predictions made by the WTP simulation model) of the planning alternatives with respect to compliance with disinfection and DBPs. This paper gives a description of the tool and some examples of how this tool can be used in planning. Includes figures.