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Question
What are the Time Series types supported for a 2D Overland Flow simulation using rain on grid?

Answer 
There are multiple options to load rainfall timeseries on the surface for 2D Overland flow simulations: constant, uniformly time distributed, spatially distributed and spatially and time varying. 
They are accessible through Boundaries Conditions | 2D Precipitation and Evaporation - see Fig. 1.

 

Fig. 1 - Boundaries Conditions | 2D Precipitation and Evaporation

Description of options
Below you have a step-by-step description of your 4 options: constant, uniformly time distributed, spatially distributed and spatially and time varying.

Option 1 - Constant rain intensity
The first available option to load is a constant rain intensity which is equally applied throughout the 2D domain – see Fig. 2

 

Fig. 2 - Option 1 - Constant rain intensity

Option 2 - Rain varying in time 
The second option is to set a rain varying in time, regular time series in the format of *.dfs0 – see Fig. 3


Fig. 3 - Option 2 - Rain varying in time

Option 3 - Varying in domain and time
The third option is to set the rain as varying in domain and time, this would represent the same spatially distribution or a RADAR reported time series, nonetheless since the rain is applied directly on the grid there is no need to apply weights to different catchments.

Fig. 4 – Option 3 - Varying in domain and time

Option 4 - The option None
The option none simply disables the boundary condition from being applied to the surface.

Conclusion 
The input for rainfall time series can be a constant defined value, a dfs0 file or a dfs2 file.
Moreover, the rainfall time series must:

  1. have an Item type set to Rainfall rate
  2. only include 1 item in the file
  3. And finally, for a spatially varying rain specified with a dfs2 file the file must have the same number of cells and cell size as the DEM. 

 

FURTHER INFORMATION & USEFUL LINKS

Manuals and User Guides
MIKE+. 2D Overland User Guide.

Release Notes
MIKEPlus Release Notes 2022

Training options
MIKE+ CS - Getting started with urban drainage modelling 
MIKE+ 2D Overland Flow - Getting started with urban flood modelling

 

 

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