ISIS Free
ISIS Free has all the same features as ISIS Professional which enables you to confidently apply it to smaller river modelling projects (i.e. flood risk assessments, flood mapping, and design projects) and then seamlessly move to ISIS Professional should your project grow beyond the 200 nodes restriction and size restrictions on ISIS Mapper input files.

Key benefits of ISIS Free
- it’s FREE
- install it on as many computers as you like as its use is not limited
- undertake both steady and unsteady calculations
- use ISIS Mapper to build hydraulic models, analysis results, and visualise model outputs
- use the full range of structure (including logical rules)
- full use of hydrology units (including FEH, ReFH, USSCS)
- model floodplain flows through either 1D or quasi-2D flow simulations
- seamlessly upgrade to ISIS Professional as a project grows
Users can sign up to an annual support and maintenance contract to gain direct access the ISIS support team and the ‘isisuser’ support community.
Should your project grow to need integrated 1D – 2D modelling, sediment transport modelling or water quality modelling then users can upgrade to ISIS Professional with the appropriate add-on modules.
Download ISIS Free
Download the ISIS Quick Start Guide
ISIS modules
ISIS Professional key features
- ISIS Flow – one-dimensional open channel and culverted flow simulation engine with complex structures and operating rules.
- Combined 1D and 2D full solution using ISIS-TUFLOW
- ISIS Mapper - a GIS framework for buildings models, analysing results and visualising 1D and 2D modelling outputs
- Hydrology module includes the UK standard and the revitalised FEH rainfall-runoff method and SCS CN method
- Muskingum-Cunge flood routing module
- Sediment transport and Water Quality modules
- User-friendly interface enabling easy data entry and visualisation.
- Map-based network visualiser
- Detailed on-line help facility
- Flood mapping links via ArcGIS or DeltaMapper