Storm Water Management Model (SWMM)

The EPA Storm Water Management Model (SWMM) is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas on which rain falls and runoff is generated. The routing portion of SWMM transports this runoff through a conveyance system of pipes, channels, storage/treatment devices, pumps, and regulators. SWMM tracks the quantity and quality of runoff generated within each subcatchment, and the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period comprised of multiple time steps. SWMM was first developed back in 1971 and has undergone several major upgrades since then. The current edition, Version 5, is a complete re-write of the previous release. Running under Windows, EPA SWMM 5 provides an integrated environment for editing drainage area input data, running hydraulic and water quality simulations, and viewing the results in a variety of formats. These include color-coded drainage area maps, time series graphs and tables, profile plots, and statistical frequency analyses.

美国环境保护署（EPA）雨水管理模型（Storm Water Management Model，SWMM）是一款动态降雨-径流模拟模型，主要用于城市区域的单事件或长期（连续）径流总量与水质模拟。该模型的径流模块基于一系列承接降雨并产生径流的子汇水区运行；其汇流传输部分则通过由管道、渠道、储存/处理设施、泵组及调节器组成的输配系统，输送上述生成的径流。SWMM可追踪每个子汇水区内产生的径流水量与水质，以及由多个时间步长构成的模拟时段内，各管道与渠道中的水流流速、水深及水质状况。SWMM最早于1971年开发完成，此后历经多次重大升级。当前的5.0版本是对前一版本的完整重写。在Windows系统下运行的EPA SWMM 5提供了集成化工作环境，支持编辑汇水区输入数据、开展水力与水质模拟，并可通过多种格式展示结果，包括配色分级的汇水区地图、时间序列图表与表格、剖面绘图以及统计频率分析。