🌊 InfoWorks ICM 1D Hydraulic Model Equations:
This section covers the equations used by InfoWorks ICM for 1D hydraulic modeling in InfoWorks networks. For 2D engine equations, please refer to the Basic 2D Hydraulic Theory topic and 2D Conduits topic.
For SWMM networks hydraulic equations, please consult the SWMM Reference Manual (Hydraulics) available on the EPA website.
🧩 Solution Model:
The solution model for conduits is chosen via the Solution model field in the associated property sheet.
Conduit Model (Full solution model):
- Representation: Conduits are depicted as links between two nodes with defined lengths.
- Boundary Condition: Between a link and a node, it can either be outfall or headloss type.
- Gradient: Determined by invert levels at both link ends.
- Cross-Sectional Shapes: Pre-defined shapes available for closed pipes and open channels.
- Hydraulic Roughness: Two values can be assigned.
- Sediment: Permanent depth can be defined, but no erosion or deposition is accounted for.
- Key Equations: Saint-Venant equations.
Pressurised Pipe Model:
Use this model for specific pipes such as rising mains or inverted siphons.
Force Main Model:
An advanced feature representing certain pressurised systems. Consult Innovyze Support for details.
Permeable Solution Model:
Used for specific pipes like permeable pavements.
Finite Volume Solution Model:
- Use Case: Specifically for complex trans-critical flow scenarios, like hydraulic jumps within a conduit.
- Solver: Built into the existing solution scheme.
Solver:
The Newton-Raphson method is utilized to ensure the stability of calculations. The method is characterized by potentially quadratic convergence. Non-linear effects might adjust the timestep.
Modelling Features:
- Supercritical Conditions: Likely in conduits with a slope greater than the critical slope.
- Low Depths in Conduit: At low depths, the same discharge can occur at two varied downstream depths.
For a more comprehensive study, ensure you delve deeper into each section to understand the nuances and details of the hydraulic theory. Proper understanding will lead to accurate modeling and simulation results. 📝🌊🌐.
