NICHE Vlaanderen is a hydro-ecological model for valley-ecosystems in Flanders. It is based on the Dutch model NICHE (Nature Impact Assessment of Changes in Hydro-Ecological System) of Kiwa Water Research, the Netherlands. NICHE Vlaanderen can be used to evaluate the impact of changes in the water management to groundwater dependant vegetation. The model is based on a number of location factors that are important for the vegetation: soil type, hydrology, nutrient availability and acidity. Based on calculated abiotic properties of the location NICHE determines whether certain vegetation types can develop. This project is a redevelopment of an existing ArcGIS plugin in Python, without external non-open source dependencies. This is planned to be the last beta before the 1.0 release, so please test!