Table 1

Parameters in streamflow calculation

Streamflow calculation
Function MethodEvapotranspirationRunoff generationRunoff separationStreamflow concentration
Three-layer evaporation patternVertical mixed runoff methodFree water storage reservoirLinear reservoirMuskingum method
Meaning of parameter and its value range K: ratio of potential evapotranspiration to pan evaporation (0.2–1.0) WM: areal mean tension water capacity (180–350)
FC: average steady infiltration rate of watershed (0.1–10) 
KI: outflow coefficients of interflow (0.3–0.4) CS: recession constant in the ‘‘lag and route’’ method (0.10–0.65) KE and XE are parameters of the Muskingum method, which can be initially determined by hydraulic formulas (0.05–0.55) 
WUM: tension water capacity of upper layer (10–20) CI: recession constant of interflow storage (0.65–0.95) 
WLM: tension water capacity of lower layer (60–80) B: exponent of the tension water capacity distribution curve (0.1–1.0) KG: outflow coefficients of groundwater (0.1–1.0) CG: recession constant of groundwater storage (0.1–1.0) 
C: coefficient of deep evapotranspiration (0.1–0.2) 
Streamflow calculation
Function MethodEvapotranspirationRunoff generationRunoff separationStreamflow concentration
Three-layer evaporation patternVertical mixed runoff methodFree water storage reservoirLinear reservoirMuskingum method
Meaning of parameter and its value range K: ratio of potential evapotranspiration to pan evaporation (0.2–1.0) WM: areal mean tension water capacity (180–350)
FC: average steady infiltration rate of watershed (0.1–10) 
KI: outflow coefficients of interflow (0.3–0.4) CS: recession constant in the ‘‘lag and route’’ method (0.10–0.65) KE and XE are parameters of the Muskingum method, which can be initially determined by hydraulic formulas (0.05–0.55) 
WUM: tension water capacity of upper layer (10–20) CI: recession constant of interflow storage (0.65–0.95) 
WLM: tension water capacity of lower layer (60–80) B: exponent of the tension water capacity distribution curve (0.1–1.0) KG: outflow coefficients of groundwater (0.1–1.0) CG: recession constant of groundwater storage (0.1–1.0) 
C: coefficient of deep evapotranspiration (0.1–0.2) 
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