Stormwater Management Model (SWMM) Information for watershed water quality, hydrology and hydraulics modelers (Note this Blog is not associated with the EPA). You will find Blog Posts and Twitter Embeds on the Subjects of SWMM5, InfoSWMM, InfoSewer, SWMMLive, InfoSWMM SUSTAIN, SWMM4 and SWMM in general.
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How is RDII Storage Simulated in SWMM 5?
Subject: How is RDIIStorageSimulated in SWMM5?
If you are using the SWMM5 Rainfall Dependent Infiltration and Inflow(RDII) feature you can also use the RDIIstorage parameters to change the RDII runoff by simulating the storage in the Sewershed. The code in RDII.C as implemented by Lew Rossman of the EPA keeps track of used and unused initial abstraction or IA (Figure 1)
When there is rainfall the following actions are taken:
· The raindepth available to be convoluted by the RDII unit hydrograph method is reduced by unused IA · The amount of IA used up is then updated
When there is no rainfall
· A portion of the IA already used is recovered using the recovery rate parameter and the variable IAUsed
Figure 1. The long term effect of the RDIIstorage on the generated RDII Unit Hydrographs. IA1, IA2 and IA3 are the Storage values for the short, medium and long term UH's.
World-Renowned Urban Drainage Modeling Authority Robert Dickinson Joined Innovyze in January, 2008Broomfield, Colorado USA, January 16, 2008/altered 20142008/2014 Robert E. Dickinson, one of the world’s leading experts in wastewater and urban drainage modeling, has joined Innovyze as Product Sector Leader. Dickinson, who comes to the company from CDM now CDMSmith, will be charged with maintaining, enhancing and supporting Innovyze's flagship SWMM5-based product line (InfoSWMM and H2OMAP SWMM as well as the GIS based InfoSewer and H2OMap Sewer), which are some of the industry’s leading wastewater and urban drainage systems design and modeling software. He will also be responsible for coordinating vital collaborative research and technology transfer with key universities and government organizations as well as developing business strategies that advance Innovye’s overall growth objectives in wastewater and stormwater systems management and heighten its initiatives in both U.S. and i…
Engine Error NumberDescription ERROR 101: memory allocation error. ERROR 103: cannot solve KW equations for Link ERROR 105: cannot open ODE solver. ERROR 107: cannot compute a valid time step. ERROR 108: ambiguous outlet ID name for Subcatchment
These warning and error messages were added in SWMM 22.214.171.124 to 5.0.016 to trap questionable raingage, link and node data. Correcting these errors does make a better model . The list shown below has the major new warnings and errors and help on interpreting the messages. WARNING01: wet weather time step reduced to recording interval for RainGage Explanation: The user selected hydrology time step is automatically reduced by the engine to match the rain gage interval. The smallest rainfall interval among all of the gages will be used during the simulation. WARNING 02: maximum depth increased for Node Explanation: The rim elevation of a node has to be at least equal to the crown elevation of the highest connecting link to the node. The maximum depth of the node is increased to match the highest crown elevation. WARNING03: negative offset ignored forLink Explanation:Negative Offsets are set to offsets of 0.0 WARNING 04: minimum elevation drop used forConduit Explanation: If the elevation acro…