Why is it said that if the water cycle is more active in a certain place, the water resources in that area are more abundant?

①Water is a valuable resource on which mankind depends for survival and development, a cheap and clean energy source, the lifeblood of agriculture, the blood of industry and the artery of transportation. It is compared with other natural resources, the main difference is that water resources are renewable and can be used forever.

② regenerative and permanent use of water resources can not be understood as "inexhaustible, inexhaustible". Permanent utilization of water resources is the development and utilization of water resources can be replenished, renewed as a condition. Renewal rate and the amount of replenishment by the intensity of the water cycle, cycle length constraints, once the intensity of water resources development over the regional water cycle renewal rate or suffered serious pollution, then you will face a shortage of water resources, or even depletion of the serious situation.

③ For a particular region, the amount of water resources can be developed and utilized is limited. Must pay attention to the rational use and protection of water resources. Only in the development and utilization intensity does not exceed the rate of renewal of the regional water cycle and the control of water pollution conditions, water resources can be constantly renewed, can be used forever.

Expanded Information

North China's urbanized areas of groundwater over-exploitation is serious, the scope has been nearly 90,000km2, accounting for 70% of the plains area....

The shallow groundwater funneling area with a total area of 41,000km2 centered on Beijing, Shijiazhuang, Baoding, Xingtai, Handan, and Tangshan has been formed respectively, in which 10,000km2 range of aquifers have been drained;

The deep groundwater funneling area with an area of 56,000km2 centered on Tianjin, Hengshui, Cangzhou, Langfang, and other cities is formed as a whole contiguous area. Groundwater depletion directly threatens the safe water reserves in the urban plains of North China, and at the same time causes serious ground subsidence and seawater intrusion, making the situation very critical.