Study region: Thirteen catchment regions of the Yellow River basin. located in northern China. Study focus: Drought is a natural phenomenon characterized by a water deficiency that impacts various aspects of the hydrological cycle. Water deficit signals propagate through the hydrological system and are manifested in the sequential occurrence of meteorological drought. https://www.herbsdailyes.shop/product-category/electrotherapy-and-sonic-therapy-electrotherapy-electrodes/