Table 4
Model parameters for Hymod, GR4J, and IHACRES
| Models | Parameters | Description | Range |
| Hymod | Cmax (mm) | Maximum storage capacity of watershed | [200, 700] |
| b exp | Spatial variability of soil moisture capacity | [05, 65] | |
| α | Factor distributing flow to the quick-flow tank | [01, 09] | |
| Rs (1/day) | Residence time of the slow-flow tank | [0001, 02] | |
| Rq (1/day) | Residence time of the quick-flow tank | [01, 09] | |
| GR4J | X1 (mm) | Capacity of the production soil (SMA) store | [100, 1200] |
| X2 (mm) | Groundwater exchange coefficient | [−5, 3] | |
| X3 (mm) | Capacity of the routing store | [20, 300] | |
| X4 (day) | Time parameter for unit hydrographs | [05, 4] | |
| IHACRES | τq (day) | Time constant governing the rate of recession of quickflow | [05, 10] |
| τs (day) | Time constant governing rate of recession of slowflow, τq < τs | [10, 350] | |
| V s | The proportion of slow flow to total flow | [0, 1] | |
| d (mm) | CMD threshold for producing flow | [50, 550] | |
| e | Conversion parameter from potential evapotranspiration to actual evapotranspiration | [001, 15] | |
| f | CMD stress threshold as a proportion of d | [001, 3] |
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