The RTK method is a hydrological method used in the design and analysis of sanitary sewer systems. It utilizes three parameters, R, T, and K, to model the runoff response in a catchment area. These parameters represent the percent of rainfall (R), the time to peak (T), and the recession coefficient (K), respectively. The RTK method has been implemented in various industry-leading sanitary sewer modeling software, such as ICM, XPSWMM, and InfoSewer.
Innovyze's ICM (Integrated Catchment Modeling) software supports both SWMM4 and SWMM5 methodologies, including SWMM5 RTK. SWMM5 is an updated version of SWMM4, featuring enhancements such as new runoff routing methods, improved water quality modeling, and additional hydrologic simulation capabilities. ICM users have the flexibility to choose between SWMM4 and SWMM5 methods, depending on their specific modeling requirements.
In SWMM5, the initial abstraction (ia) in each of the three components of RDII (Rainfall-Dependent Infiltration and Inflow) is updated at each time step. The initial abstraction is calculated as:
ia = iaMax - iaUsed
This is based on the maximum amount of initial abstraction (iaMax), the initial abstraction used (iaUsed), the recovery rate (iaRecov), and the month and class of RDII. Users can enter a value for iaMax, iaInit, and iaRecov for each month, allowing for more accurate modeling of RDII in the sanitary sewer system.
XPSWMM, a comprehensive stormwater and wastewater modeling software, incorporates the SWMM4 RTK method for hydrologic analysis. This allows users to analyze and design sanitary sewer systems using the well-established RTK method based on SWMM4 principles.
InfoSewer, another sanitary sewer modeling software, is a version of SWMM4. It provides engineers and planners with a reliable tool for simulating and managing sanitary sewer systems based on the SWMM4 methodology, including the RTK method for hydrological analysis.
RTK in Autodesk Innovyze Software
| Software | Supported Methods |
|---|---|
| ICM | SWMM4 RTK, SWMM5 RTK |
| XPSWMM | SWMM4 RTK |
| InfoSewer | SWMM4 RTK Mostly |
| InfoSWMM | SWMM5 RTK |
| ICM SWMM | SWMM5 RTK |
Paragraph Form:
The RTK method has been implemented in various industry-leading sanitary sewer modeling software, such as ICM, XPSWMM, and InfoSewer. Innovyze's ICM software supports both SWMM4 and SWMM5 methodologies, including SWMM5 RTK, providing users with flexibility in choosing the appropriate method for their modeling requirements. SWMM5, an updated version of SWMM4, offers enhancements like new runoff routing methods, improved water quality modeling, and additional hydrologic simulation capabilities. One such enhancement in SWMM5 is the ability to update the initial abstraction (ia) in each of the three components of RDII at each time step, allowing for more accurate modeling of RDII in the sanitary sewer system. XPSWMM incorporates the SWMM4 RTK method for hydrologic analysis, enabling users to design sanitary sewer systems using this well-established method. InfoSewer, a version of SWMM4, provides engineers and planners with a reliable tool for simulating and managing sanitary sewer systems based on the SWMM4 methodology, including the RTK method for hydrological analysis.
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