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Within InfoWorks ICM, scenarios are a useful way of creating options, testing different network configurations and undertaking sensitivity analysis. However, once created and no longer needed, there is no easy way to delete them en masse. It is possible to delete them one by one using the ‘Manage Scenarios’ tool and it is also possible to write an SQL which deletes a list of multiple pre-defined scenarios. Both of these approaches are time consuming.

The script is written in Ruby language within a text editor and needs to be saved as a file with extension type .rb. Once this is created, you can open the network of choice and go to Network->Run Ruby Script and navigate to the location of the Ruby script. This will then run the Ruby Script. Once run, the Ruby script will appear within the list of recent scripts. The Ruby script can also be associated with a custom action.

Ruby Scripting can be used within the user interface to manipulate data within the network, within the Open Data Import/Export Centres to filter and adjust import fields and also with ICM Exchange, the InfoWorks ICM API. For more information on the Ruby scripting, particularly scripts that can be run within the InfoWorks ICM user interface then please contact the support team at

In 2016, the Centre of Ecology and Hydrology ( CEH) and Wallingford HydroSolutions ( WHS) released another version of the revitalised rainfall-runoff model (ReFH2) which allows users to generate flood peak flows and hydrographs from given rainfall events for both catchment and development sites. For a full description of the approaches, the reader is referred to their document which can be freely accessed at:-

There are 2 components to the ReFH 2 model. The first is a new runoff volume and routing model, ReFH2, which was added to InfoWorks ICM in version 6.5. The second component is the FEH 2013 generated design rainfall which was added in version 7.5. This blog post will go on to describe the implementation of both components within InfoWorks ICM/ICMLive and how users can use these to generate rainfall events and runoff within these software packages.

The first point to note, is that the equations used to generate FEH2013 rainfall and ReFH2 runoff are proprietary and have not been published publicly. Therefore, unlike the previous FEH and ReFH approaches, it has not been possible to code these equations directly into the InfoWorks ICM/ICMLive simulation engines. The user therefore requires a copy of the ReFH2 software with a licence obtained from Wallingford HydroSolutions (WHS). The ReFH2 software must be available when the FEH2013 rainfall is generated and the relevant calculations are undertaken for determining the parameters for the subcatchments ReFH2 runoff. However, once the rainfall and runoff parameters have been determined, InfoWorks ICM/ICMLive simulations do not need access to the ReFH2 software and runs can be distributed onto other machines/servers as is desired.

More than twenty years ago I wrote a Master’s Thesis about software tools that could be put together with EPA SWMM to create a toolbox for very long term continuous simulation for stormwater and watershed simulations. I was inspired at the time by Dr. William James who was my advisor for that research. At that time typical stormwater design and modeling (analysis) employed the rational method or a regional design storm approach. Continuous simulation was not typically used even though we had such computational capabilities for about 20 years.

Fast forward to today and there is still too much use of the Rational method and design storms. Perhaps they have their place in sizing a culvert based on conveyance or some onsite detention in the case of a design storm. However, there is simply too much misuse since these methods ignore the physical processes that are occurring. It is simply not appropriate to use such a method to design stormwater systems when storage is a significant component of the system or when there is sensitive downstream receiving waters to name just a couple cases. The rational method produces a peak flow and using that flow value in design ignores the natural attenuation that would occur to storage effects in the system and can even result in under design. Continue reading →

InfoWorks ICM, InfoWorks WS Pro and InfoNet all support the following Map Controls: ArcGIS Engine, ArcGIS Desktop and MapXtreme. The GIS Layer Control Dialog is used to choose how map layers are displayed on the GeoPlan Window. The dialog is displayed by right clicking on the GeoPlan View and choosing GIS Layer control… from the popup menu.

As well as supporting the traditional GIS layers associated with ArcGIS and MapInfo, InfoWorks and InfoNet can utilise Map Layers offered up by WMS Servers. An example would be mapping provided by Open Street Map ( This resource provides maps of the world that are free to use under an open licence. Users can connect the GeoPlan view to both remote web servers and LAN servers.

To utilise WMS you need to know the URL of the Web Map Server. Many of the publicly available server can be found by searching with Google. For example, one WMS addresses for Open Street Map is This will provide a colour map, but if you’d like a black & white version, you could try ? instead.

Here are some examples you might like to experiment with that can all be used free of charge as background layers for your model. As many organisations offer WMS as a free service, they do not always guarantee any continued availability, but most organisations do their best to keep them up and running. Please let me know if you have a favourite WMS resources and I’ll update this blog.