Methodology
Two-parameter monthly water balance
model
The TWBM was applied in this study to simulate the catchment
rainfall-runoff relationship. The TWBM was developed by Xiong & Guo
(1999) and has been widely applied worldwide to simulate monthly runoff
(Guo et al., 2005; Zhang et al., 2013; Deng et al., 2016). The model
inputs are potential evapotranspiration (PET) and precipitation
(P ), both of which are readily available or can be estimated from
routine meteorological observations (Xiong & Guo, 1999).
Monthly actual evapotranspiration (\(E_{i}\)) is estimated in TWBM as: