Impact model: WAYS

WAYS is a large scale distributed hydrological model that works on both the global and regional scales. Apart from the traditional hydrological models, WAYS improves the integrality of soil water simulation and integrates the separately derived root zone water storage in the model, thus can consider the water circulation in the entire root zone during the hydrological simulation. As a result, it can reflect the impacts of the natural spatial heterogeneity of the plant rooting system on soil water dynamics. For a full technical description of WAYS can be found in our recently published paper in GMD: Mao, G., & Liu, J. (2019). WAYS v1: a hydrological model for root zone water storage simulation on a global scale. Geoscientific Model Development, 12(12), 5267–5289.

Water (global)
Contact Person

Information for the model WAYS is provided for the simulation rounds shown in the tabs below. Click on the appropriate tab to get the information for the simulation round you are interested in.

Basic information
Model Version: v1
Model Homepage:
Model License: GPL-3.0 License
Simulation Round Specific Description: ISIMIP2a ISIMIP2b ISIMIP3a ISIMIP3b
Reference Paper: Main Reference: Mao G, Liu J et al. WAYS v1: a hydrological model for root zone water storage simulation on a global scale. Geoscientific Model Development,12,5267-5289,2019
Person Responsible For Model Simulations In This Simulation Round: Ganquan Mao (
Spatial Aggregation: regular grid
Spatial Resolution: 0.5°x0.5°
Temporal Resolution Of Input Data: Climate Variables: daily
Temporal Resolution Of Input Data: Soil: constant
Input data sets used
Observed Atmospheric Climate Data Sets Used: GSWP3-W5E5, GSWP3-EWEMBI, GSWP3, Historical observed climate data, PGMFD v2.1 (Princeton), WATCH (WFD), WATCH-WFDEI
Climate Variables: hurs, huss, tasmax, tas, tasmin, uas, rlds, wind, rhs, rsds, pr
Was A Spin-Up Performed?: Yes
Spin-Up Design: 5 years spin-up
Soil Layers: the entire root zone
Was The Model Calibrated?: True
Which Years Were Used For Calibration?: 1986-1995
Which Dataset Was Used For Calibration?: ISLSCP II UNH/GRDC Composite Monthly Runoff
How Many Catchments Were Callibrated?: all the pixels
Potential Evapotranspiration: Penman– Monteith FAO 56 PM method
Snow Melt: degree-day method