Operational control rules determine how pumps and flow regulating structures (i.e., orifice and weir) in the conveyance system will be adjusted over the course of a simulation. InfoSWMM H2OMap SWMM InfoSWMM SA has the following three control classes.
· Initial Status - The initial status editor enables specification … Read the rest
Runoff Coefficients
Runoff coefficient is loosely defined as the ratio of runoff to rainfall, and is a function of watershed characteristics including land use, soil type, and slope of the watershed. The value of runoff coefficient ranges between 0.0 and 1.0. A value of 0.0 means that all of the … Read the rest
2.5 Decomposing the Corrected Flow Data
The corrected flow data can be decomposed into its DWF, GWI, and RDII flow components with the help of the rainfall data. The decomposition process is illustrated in this section.
Determining the DWF Component
The first step towards determining the DWF component of the … Read the rest
InfoSWMM and InfoSWMM SA offer 13 choices for modeling surface runoff (click on link to see more information on each method):
Example 5. Runoff Water Quality
This example demonstrates how to simulate pollutant buildup and washoff in an urban catchment. The influence of different land uses on pollutant buildup is considered and both Event Mean Concentrations (EMCs) and exponential functions are used to represent the washoff process.
Surface runoff quality is … Read the rest
SWMM 5.1 Error Messages
APPENDIX E – Error and Warning Messages in the Engine of InfoSWMM H2OMap SWMM InfoSWMM SA from #SWMM5
| ERROR 101: | memory allocation error.
There is not enough physical memory in the computer to analyze the study area. |
| ERROR 103: | cannot solve KW equations for Link xxx. |
Excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here
Management of stormwater quality is usually performed through a combination of so-called “best management practices” (BMPs) and a form … Read the rest