1. An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling
presented by
Andrew Walker
Innovyze Ltd

2. Modeling is now a pre-requisite to understanding the impact of Urban Development
Government Directives dictate that Utilities and Cities now strictly control and closely manage their drainage networks.

3. The ability to simultaneously represent all flow paths is a necessity for integrated studies
Requirement : To model “all sources” of flooding.
Solution : Fully Integrated Catchment Analysis.

4. Fully integrated 1D and 2D simulation of above- and below-ground drainage networks in one powerful package
To succeed, the software needs to combine these advanced modelling requirements in a single application with one Simulation engine.

5. The 1D Engine Requirements
Free surface and pressurized flows
Flows not following predetermined directions
Backwater effects
Small depth situations
Dry initial conditions
Looped networks
Pipes, culverts and non-prismatic channels
Ancillary structures, including bridges

6. The 1D Engine Solution
Solves the full dynamic equations of gradually varied flow (St. Venant equations)
A four-point implicit finite difference scheme
Non-linear Newton-Raphson iteration and an adaptive time-stepping algorithm
Convergence to within a relative tolerance of 1% before proceeding to the next timestep
Solution method is unconditionally stable, so there is no limit on the magnitude of the time-step to ensure stability

7. The 2D Engine Requirements
Suitable for surface flood flows
Fits around complex urban geometry
Efficient run-times
Simple to couple with existing 1D models
InfoWorks 2D/3D slide
In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

8. The 2D Engine Solution Finite volume Conservation of mass and momentum
Unstructured triangular mesh
Gudunov scheme – Riemann solver
Semi-implicit, dual time-stepping Runge-Kutta (predictor-corrector)
Shock capturing
InfoWorks 2D/3D slide
In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

9. The 2D Mesh Generation Floodplain in rural area Simple structured mesh
2D Hydraulics
Complex geometry in urban area
Detailed unstructured mesh

10. 2D Linkages with 1D Model

11. 2D Linkages with 1D Model

12. 2D Engine Results InfoWorks 2D/3D slide
In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

13. Calculate overland flow path and likely property inundation
2D Engine Results
InfoWorks 2D/3D slide
In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

14. River Flooding and Bridge Inundation
2D Engine Results
River reaches
Bridges
Radial sluices
Flood mapping

15. The ability to simultaneously represent all flow paths is a necessity for integrated studies

16. 1D and 2D Integrated Results
Case Study - Calculate cause of property flooding – stormwater or river flooding?
1D and 2D Integrated Results

17. An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling

18. An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling
presented by
Andrew Walker
Innovyze Ltd