31 July 2017 • Laurent Courty
After several months of development, the version 17.7 of Itzï is available on the Python package index. The exciting news is the integration of the SWMM drainage network model. Itzï can now model a drainage network and the interactions with the surface model. The documentation will be updated soon to take into account this new version.
Itzï now integrates with SWMM. The two models exchange mass at the drainage nodes that are inside the modelling area. The drainage network that is actually modelled could be larger that the GRASS raster mask, but the mass interchange will only occurs at the nodes inside the raster modelling region. The results from the network model are exported as a GRASS space-time vector dataset. Itzï uses weir and orifice equations to calculate the flow exchange between the drainage and the surface.
This new feature induces some changes in the configuration file.
First, the drainage capacity option is renamed to losses. This option could be used in a more general way and keeping that name could have created some confusion.
If Itzï is run with an older option name, the user will receive a deprecation warning. Those legacy options are set for deletion in a later release. Please update your configuration files.
Second, a new [drainage] section is added, were the SWMM INP file and the output STVDS are set.
To update your installation to the last version, type the following in the command line:
pip install -U itzi