Water resources information

Water is the basic requirement to maintain life and health. Although 765,438+0% of the earth is covered by water, the fresh water resources are extremely limited. Of all the water resources, 97.47% is undrinkable salt water. Of the remaining 2.53% fresh water, 87% are ice and snow in polar ice sheets, alpine glaciers and permafrost zones that are difficult for human beings to use.

What humans can really use is a part of rivers, lakes and groundwater, which accounts for only 0.26% of the total water volume of the earth and is unevenly distributed. As a result, more than/kloc-0.4 billion children, women and men in the world do not have access to sufficient and safe water to maintain their basic needs.

On many levels, water resources and health are closely related. Every decision we make is actually related to water and its impact on health.

Extended data:

The waste of water will surprise people, and water resources often pass at the fingertips. There are about 2 million faucets and 6.5438+0.3 million toilets in Nanjing. If a quarter of it leaks, hundreds of millions of tons of water will be lost a year! In addition, the hidden leakage of underground pipelines is even more shocking. Most water users have hidden leakage, and the monthly leakage of individual units can even reach more than 10 thousand tons!

A dripping faucet can waste 1 to 6 liters of water a day, and a leaky toilet can waste 3 to 25 liters of water a day. So we should cherish every drop of water.

Water is not inexhaustible, so we should save water. We should start from everything around us, from the dribs and drabs of life. A drop of water is insignificant, but if you keep dripping, the amount will be considerable. It is estimated that "dripping" 1 hour can waste 3.6 kilograms of water; 1 month can collect 2.6 tons of water.

This water is enough to supply a person's living needs. It can be seen that there should be no waste at all. As for the continuous small water flow, it can collect 17 kg per hour and 12 tons per month; The roaring flood can collect 670 kilograms of water per hour and 482 tons of water per month. It can be seen that water conservation should start from scratch.

Baidu Encyclopedia-China Water Resources