One of the most used 1D tools to model collection systems is the Storm Water Management Model (SWMM). Solving the full form of the Saint Venant equations, this model represents typical unsteady flow conditions in sewer systems. However, it may be insufficient to address fast transient flow conditions that can be present during extreme events or unscheduled operational conditions. SWMM version 5.1.013 was implemented the Preissmann slot as an alternative method to handle pressurization. To date, no studies were found analysing the applicability of SWMM to represent closed-pipe fast transient flows applying the Preissmann slot pressurization algorithm. Therefore, the present work investigates the ability to model different fast transients conditions in SWMM under various spatial and temporal discretizations along with variations in the Preissmann slot algorithm. Using an alternative implementation of the SLOT pressurization algorithm, along with artificial spatial discretization and routing time-steps estimated by the Courant stability condition, it is shown that SWMM is capable to perform satisfactory certain types of closed pipe transient simulations.

用于模拟收集系统的最常用的一维工具之一是雨水管理模型 (SWMM)。该模型求解了 Saint Venant 方程的完整形式，代表了下水道系统中典型的非稳态流动条件。然而，它可能不足以解决在极端事件或计划外运行条件下可能出现的快速瞬态流动条件。SWMMH 版本 5.1.013 实施了 Preissmann 槽作为处理加压的替代方法。迄今为止，还没有研究发现分析 SWMMH 的适用性来表示应用 Preissmann 槽加压算法的闭管快速瞬态流。所以，目前的工作研究了在各种空间和时间离散化以及 Preissmann 槽算法的变化下模拟 SWMM 中不同快速瞬态条件的能力。使用 SLOT 加压算法的替代实现，以及由 Courant 稳定性条件估计的人工空间离散化和路由时间步长，表明 SWMM 能够执行令人满意的某些类型的封闭管道瞬态模拟。