According to a press conference of the Ministry of Water Affairs, China has now established a network of hydrological observatories of its large rivers and their major tributaries, for flood countermeasures and water quality control. Observation points now number 121,000, with 3,154 stations, 14,286 surface water quality stations and 26,550 groundwater quality stations.
Japan JST China news January 21, 2020
China has established 121,000 hydrological observation points for flood countermeasures, many for quality control