The Pressure and Force Main solutions do not use a Preissmann Slot. ICM has three conduit models: Conduit, Pressure and Force Main. ICM and XPSWMM use a Preissmann Slot for surcharged conduit flows. Related issues cause the need for a hot start file in SWMM5 and XPSWMM. This same issue affects the procedure in which ICM initializes the network before commencing the network simulation. SWMM5 and XPSWMM can simulate truly dry links and nodes. ICM links never dry out as there is a small base flow or base depth in all links. However, there are key differences in how the numerical engines compute the flows, depths and associated hydraulic parameters in links and nodes. All these 1D solutions share the need for modeling and simulating the smooth transition between dry flow, partial flow, pressure flow and flooding flow. They all have linear link, connecting node and polygon area driven simulation engines so they all look similar in the network view. The Stormwater and Sewer models SWMM5 (InfoSWMM and PCSWMM use the SWMM5 engine), InfoWorks ICM and XPSWMM (which uses a modified SWMM4 engine) share the commonality of solving the 1D St Venant Solution for a large range of link open and closed conduit shapes.
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