WetSpass-M 2.7

WetSpass-M is a GIS-based, spatially distributed monthly water balance model developed at the Vrije Universiteit Brussel (VUB). Designed to quantify how precipitation is partitioned across landscapes, it simulates, on a cell-by-cell basis, actual evapotranspiration, surface runoff, and groundwater recharge. The model integrates land use/land cover, soil texture, topography (slope), and depth to groundwater with monthly meteorological inputs to capture intra-annual variability in hydrologic processes. WetSpass stands for Water and Energy Transfer between Soil, Plants and Atmosphere under quasi-Steady State; WetSpass-M extends the approach to a monthly time step.

Key capabilities:

• Monthly, raster-based estimation of water balance components
• Parameterization by land-use classes (e.g., forest, cropland, urban, open water), including interception and impervious fractions
• Integration of soil and terrain data to represent infiltration and runoff behavior
• Spatially distributed recharge outputs commonly used as inputs to groundwater flow models such as MODFLOW
• Support for baseline assessments and scenario analysis of climate and land-use change impacts

Typical inputs:

• Monthly precipitation and potential evapotranspiration (or data to derive PET)
• Land use/land cover map
• Soil texture map
• Digital elevation model–derived slope
• Depth-to-groundwater map (where available)

Typical outputs:

• Gridded maps and summaries of actual evapotranspiration, surface runoff, groundwater recharge, and interception for each month and aggregated periods

WetSpass-M is widely used by hydrologists, water resource managers, and researchers for recharge mapping, water balance analysis, and impact assessments, and it is maintained by VUB’s Department of Hydrology and Hydraulic Engineering.

WetSpass-M is developed by VUB. The most popular version of this product among our users is 2.7. The name of the program executable file is WetSpass-M.exe.

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