In what year did Sanming city fully complete the delineation of the river management scope line of rivers with a basin area of more than 50 square kilometers?

1, rivers with dikes are within the range of 8 meters to 15 meters on both sides of the toe line outside the dike;

2, there is no dike river, extending from eight meters to twenty-five meters on both sides of the upper reaches of the river;

3, flood control and moisture-proof seawall, for the toe line inside and outside the extension of 30 meters to 50 meters.

Including rivers, sandbars, beaches, dams, coastlines, etc. And the scope of river control and protection reserved for river widening, regulation, ecological landscape and greening outside the scope of river management.

The main function is to control the waters from being illegally filled and blocked, and to ensure the safety of flood control. According to the water conservancy and other river planning approved by the municipal and district water conservancy administrative departments, and following the relevant laws, regulations and technical standards, the control line of river planning land scope is delineated. Generally, it consists of five lines, namely, estuary line, river center line and land control line.

Importance of river management

1, rivers are carriers of water resources.

Rivers, lakes and reservoirs are carriers of water resources. Surface water mainly exists in the form of river runoff, lakes and reservoirs.

2. It has the ability of flood discharge.

During the precipitation period, rivers can eliminate runoff from their catchments, which are the main channels for flood discharge. China is located in the monsoon belt with large river flow in the northern hemisphere, and the precipitation in flood season accounts for 60% ~ 80% of the whole year in most areas, which is easy to form river floods and endanger people's lives and property. The flood discharge and drainage function of rivers plays an extremely important role in ensuring the national economy, urban safety and people's lives.

3. It has the ability of water storage and irrigation.

China's comprehensive regulation and control capacity of water resources has improved, basically ensuring the demand for water resources for economic and social development. The comprehensive regulation of water resources includes a wide range of contents, including the regulation of river storage. River is the carrier of natural water flow, which has the functions of storing water and stagnant water. When the weather is dry and there is no precipitation, the river collects the groundwater at the source and both banks to maintain the stable runoff of the river, which is not only an important water source for agricultural irrigation, but also a supplementary water source for regulating the urban environment and water supply.

4. It has the function of hydroelectric power generation.

China is rich in river hydropower resources. According to the recent national review of hydropower resources, the theoretical reserves of hydropower resources in Chinese mainland alone are 694 million dry watts, and the annual power generation is 6.08 trillion dry watts. Hours, the technically developable installed capacity is 542 million dry watts, and the technically developable annual power generation is 2.47 trillion dry watts? Hours, the economically exploitable installed capacity is 402 million dry watts, and the economically exploitable annual power generation is 1.75 trillion dry watts? hour

5. It has the function of inland navigation.

China is rich in water transport resources and has good conditions for developing inland river shipping. Water transport has the characteristics of less land occupation, large transport capacity, low energy consumption, less pollution and relative safety. Most rivers and lakes in China are not frozen in winter, and the shipping flow is abundant. At present, the navigable mileage of inland waterways in China is 1.23 million kilometers, mainly distributed in the Yangtze River, Pearl River, Huaihe River, Heilongjiang River and Songliao River system. The areas south of Huaihe River and Qinling Mountain are rich in river water transport resources in China, and the degree of development and utilization is high. Rivers and lakes are not frozen in winter and open to navigation in all seasons.

6. It has the function of fishery culture.

River is a valuable land resource in China. In addition to irrigation for shipping farmland, rivers in plain areas and mountainous areas have been developed and utilized through people's fishing activities for many years and become good places for fish farming. Due to the advantages of small investment, labor saving, quick effect, large income and concentrated commercial fish, river fish culture has developed rapidly in recent years, and the water surface of fish culture has increased year by year.

China is a big freshwater aquaculture country in the world, and its freshwater products account for more than 66% of the total output of aquatic products, ranking first in the world. 2/KLOC-0 Since the beginning of the century, with the decline of global marine fishery resources, the demand for aquaculture varieties in the international market is increasing, and aquaculture has increasingly become a national pillar industry.

7. It has the function of tourism landscape.

Rivers are not only important tourist resources, but also important landscapes in many cities, and important types of tourist resources such as waterfalls, ponds and tidal bore in rivers. The scenery on both sides of the river is pleasant, the river is clear, the beaches and ponds alternate with each other, the winding banks constitute the unique scenery of the river, and the flowing water body and the stable dam constitute the aesthetic implication of the combination of static and dynamic.

With the development of economy and the improvement of people's living standards, people have higher and higher requirements for river water environment and landscape function. The appearance of ecological revetment, such as river bank greening and sketch buildings, provides people with more and more beautiful hydrophilic leisure and entertainment space, and also promotes the development of cities and tourism.

8. It has ecosystem function.

Rivers and surrounding animals, plants and microorganisms can form a vibrant river ecosystem, and rivers are also an important factor in forming and supporting many ecosystems in nature. While transporting runoff, rivers also transport biological substances and mineral salts brought into runoff by precipitation, providing nutrients for organisms in rivers, even in river basins and offshore areas, transporting seeds for them, and discharging and decomposing wastes. Rivers are flowing ecosystems.

The close relationship between land-water phase and water vapor phase of natural rivers, coupled with the twists and turns of natural river plane, ups and downs of longitudinal section, diverse shapes of cross section and porous and permeable riverbed, is particularly suitable for the growth of various organisms, forming a rich and colorful river biological community along the river.

9. It has the function of cultural inheritance.

Rivers are not only a natural phenomenon formed by flowing water, but also an important part of the history of human civilization. As the source and object of human spiritual life, it also influences and shapes human spiritual life, cultural history and civilization development. The endless running, twists and turns, convergence and separation, stormy waves and clearness of rivers all give symbols to human spirit, personality and morality.

As a common image in nature, rivers have rich life and cultural connotations because of the creation of literati and laborers in past dynasties. River culture has always been a glorious chapter in the history of human culture.

Baidu Encyclopedia-People's Republic of China (PRC) River Management Regulations