WetSpass (Water and Energy Transfer between Soil, Plants, and Atmosphere under quasi-Steady State) is a GIS-based, spatially distributed water-balance model developed at the Vrije Universiteit Brussel (VUB). It estimates long-term average spatial patterns of key hydrologic components—groundwater recharge (percolation), actual evapotranspiration, surface runoff, and interception—by integrating climate, land-use, soil, topography, and groundwater data. Within each grid cell, WetSpass partitions the landscape into vegetated, bare soil, impervious, and open-water fractions to better represent real-world heterogeneity.

Key capabilities:

Long-term, quasi–steady-state water-balance estimation on a raster grid
Mixed land-cover representation within each cell, including interception and depression storage
Scenario analysis for land-use and climate variability
Recharge outputs suitable for coupling with groundwater flow models

Typical inputs:

Spatial layers: land-use/land-cover, soil texture or hydraulic properties, elevation/slope, groundwater depth
Climate data: precipitation and potential evapotranspiration (or variables from which PET can be derived)

Outputs:

Gridded maps and summary statistics of groundwater recharge, actual evapotranspiration, surface runoff, and interception

Common applications:

Groundwater recharge mapping and aquifer resource assessment
Watershed and urban water management
Evaluating impacts of land-use change or climate variability on recharge and runoff

Notes:

WetSpass is designed for long-term or seasonal analyses rather than event-based flood modeling.
Accuracy depends on input data quality and appropriate calibration.
A monthly variant (often referred to as WetSpass-M) extends the approach for seasonal analyses.

WetSpass is developed by VUB and is used by 1 user of Software Informer. The most popular version of this product among our users is 1.0. The name of the program executable file is Wetspass.exe.

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