New Events Editor In EPA SWMM 5.1.011 and InfoSWMM Non Steady Period Dialog
The Events Editor in SWMM 5 (Figure 2) is activated when the Events sub-category of simulation Options is selected for editing from the Project Browser. InfoSWMM has the same feature but it called Non Steady Period (Figure 1) It is used to limit the periods of time in which a full unsteady hydraulic analysis of the drainage network is performed. For times outside of these periods, the hydraulic state of the network stays the same as it was at the end of the previous hydraulic event. Although hydraulic calculations are restricted to these pre-defined event periods, a full accounting of the system's hydrology is still computed over the entire simulation duration. During inter-event periods any inflows to the network, from runoff, groundwater flow, dry weather flow, etc., are ignored. The purpose of only computing hydraulics for particular time periods is to speed up long-term continuous simulations where one knows in advance which periods of time (such as re...