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China: Flood Management

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China: Flood Management WORLD METEOROLOGICAL ORGANIZATION THE ASSOCIATED PROGRAMME ON FLOOD MANAGEMENT INTEGRATED FLOOD MANAGEMENT CASE STUDY1 CHINA: FLOOD MANAGEMENT January 2004 Edited by TECHNICAL SUPPORT UNIT Note: Opinions expressed in the case study are those of author(s) and do not necessarily reflect those of the WMO/GWP Associated Programme on Flood Management (APFM). Designations employed and presentations of material in the case study do not imply the expression of any opinion whatever on the part of the Technical Support Unit (TSU), APFM concerning the legal status of any country, territory, city or area of its authorities, or concerning the delimitation of its frontiers or boundaries. WMO/GWP Associated Programme on Flood Management CHINA: FLOOD MANAGEMENT Zhang Hai-lun1 Introduction China has been frequently hit by big floods and suffered from flood disasters. The critical issue is that about 8% of the land area located in the middle and down stream of the seven major rivers are prone to floods, where is inhabited 50% of total population and contributes over 2/3 of total agricultural and industrial product value. 1. Geographic features 1.1 Climate The vast area of the East China and most part of the South China are dominated by the Eastern Asia monsoon, which are affected by the oceanic air current in summer and winter are controlled mainly by the continental air current in winter. These phenomena result in dry winter and wet summer. The annual areal distribution of precipitation is extremely uneven and descends from southeast to northwest. In southeastern coastal areas and some regions of southwest China the mean annual precipitation depth is higher than 2,000 mm. In south of the middle and lower reaches of the Yangtze River, it is over 1,000 mm. In the region of Qinling and Huaihe River Basin, it is around 800 mm. For vast area of northwest and Inner Mongolia the annual precipitation drops to less than 400 mm. 1.2 Topography The terrain of China is high-elevated in the west and of low altitude in the east. The highest area is Qinghai-Tibet Plateau with elevation higher than 4,000 m down to the coastal plain areas being below 50 m. The mountainous area accounts for 33% of the total Chinese territory, the plateau, hilly area, inter-mountain basins account for 26%, 10% and 19% of the total respectively, and the plain area is only 12%. 1.3 Rivers China has about 50,000 rivers with the area being larger than 100 km2, among which more than 1,500 rivers cover an area of larger than 1,000 km2. Most rivers are distributed over the eastern and southern part of China. The total basin area of the river flowing into the sea accounts for 2/3 of the total area of Chinese territory, and the remaining 1/3 belongs to the inland river basins. Taking into account the flood issues and social and economic importance, the following seven river basins are considered as major ones, namely: Yangtze, Yellow, Soughua, Liaohe, Haihe, Huaihe and Pearl River Basin. The middle and down stream of major rivers and coastal areas are plains with fluvial deposit and shallow ground water aquifer. 1.4 Soil Out of the total land area of 9.6 million km2 of China, the non-usable land including Rocky Mountains, petrified soils, waste land in high altitude and frigid temperature, Gobi deserts and glaciers account for about 38%. The black soil is distributed in northeast plain with high proportion of humus. The yermosol and xerosols are widely distributed in remote north and northwest provinces and autonomous regions with dry climate. 2 Flood and flood disasters 2.1 Type of flood 1 Institute of Hydrology and Water Resources, Nanjing Hydraulic Research Institute, Nanjing, China 1 WMO/GWP Associated Programme on Flood Management The flood caused by storm rainfall with large coverage and high concentration predominates the flood disasters in plain area of the seven major rivers of China, despite the fact that isolated local storm frequently produces flash floods, land slides and even dam failures in mountainous regions. Snow melt and glacier floods in spring season occur in western mountainous regions of the country. Due to its slow melting process, snowmelt in general does not cause significant threat to the downstream of these small rivers. However, the ice jams in spring season in the upper reaches of the Yellow River and Songhua River often results in disastrous flood to the middle and down stream of the two rivers. China has long coastal lines, with the total length of 18,000 km which are affected by storm surge, astronomical tide tsunamis as well as the river floods which can result in serious consequences as some of these harmful events occur concurrently. 2.2 Historical floods The magnitude of the maximum floods varies widely, based on the recorded and investigated historical flood data of 6,000 river reaches of the country, the noticeable events are given in Table 1. Table1 The observed/investigated maximum flood discharge for major rivers in China River Station area Investigated observed (km2) discharge Year Discharge Year Nenjiang Jiangqiao 177300 15600 1932 10600 1969 Second Jilin 44100 12900 1909 7720 1953 Songhuajiang Hunhe Shenyang 7920 11900 1888 5550 1935 Taizihe Benxi 4190 10200 1888 14300 1960 Liaohe Tieling 120760 8740 1886 14200 1951 Dalinghe Fuxinbao 2932 16200 1930 4660 1959 Dalinghe Balinghe 17690 30400 1949 15000 1962 Luanhe Luanxian 44100 35000 1886 34000 1962 Yongdinhe Guantin 43400 9400 1801 4000 1939 Jumahe Qianhekou 4740 18500 1801 9920 1963 Hutuohe Huangbizhuang 23270 20000-27500 1794 18100 1956 Zhanghe Guantai 17800 16000 1569 9200 1956 Yellow Lanzhou 222550 8500 1904 5900 1946 Yellow Shanxian 687900 36000 1843 22000 1933 Wudinhe Suide 28720 11500 1919 4980 1966 Weihe Xianyang 46860 11600 1898 7220 1954 Jinghe Zhangjiashan 43220 18800 18XX 9200 1933 Beiluohe Zhuangtou 25150 10700 1855 4420 1940 Yihe Longmen 5320 20000 233 7180 1937 Huaihe Changtaiguan 3090 12400 1848 7570 1968 Yihe Linyi 10320 30000 1730 15400 1957 Yangtze Lizhuang 639200 65600 1520 48200 1955 Yangtze Cuntan 866600 100000 1870 65300 1968 Yangtze Yichang 1005500 105000 1870 71100 1896 Minijiang Gaochang 135400 51000 1917 34100 1961 Wujiang Gongtan 58350 24700 1830 17400 1964 Jialingjian Beibei 156100 57300 1870 37100 1974 Lishui Shanjiangkou 15240 31100 1935 15900 1950 Yuanjiang Yuanling 78600 40200 1649 27300 1943 Zishui Taojiang 26700 21500 1926 15300 1955 2 WMO/GWP Associated Programme on Flood Management Xiangjiang Xiangtan 81640 21900 1926 20300 1968 Hanjiang Huangjiagang 95200 61000 1583 27500 1958 Gangjiang Waizhou 80950 24700 1924 20900 1962 Qiantangjian Lucibu 31490 26500 1901 29000 1955 Qujiang Weiren 13500 30400 1912 23000 1952 Minijiang Zhuqi 54500 29400 1900 29400 1968 Dongjiang Boluo 25320 10300 1940 12000 1959 Beijiang Hdengshi 34000 21000 1915 18000 1982 Xijiang Wuzhou 329000 54500 1915 2.3 Flood disasters According to the historical record, 1092 big flood disaster events occurred since 206 B.C. in China in the period of 2155 years, averaging once in every two years. Beginning from the twentieth century, major rivers in China were struck by a number of serious disastrous floods. After 1949 considerable number of big floods occurred in large rivers such as the Yangtze, Yellow, Huaihe, and Haihe rivers, yet the losses were far less compared with those before 1949 because of the role of the available flood control projects and efforts made in flood preparedness. The average annual flood affected agriculture land during 1950-1990 was about 7.8 million ha, which accounts for about 7.8% of the China's total farmland. Most of these areas are located in the downstream reaches of the Yellow River, Huaihe River and Haihe River that were severely affected by flood disasters. The historical floods and flood disasters were recorded and documented by the government at different levels, which were well preserved in the archives of the government. These records were descriptive, which normally included the highest water level of the rivers, the coverage of flood affected areas, the water depth, the death toll, the estimated number of house damage, etc. The coverage of the flooded area was considered as the major indicator identifying the degree of disasters for different flood events. After 1949, the FFDDHQ requested the local government at different levels to report to the central government each year the flood disaster information including the flood affected area, flood disastrous area (30% of crop yield loss due to flood), death toll and the number of house damage. All these information were processed and coordinated with the Department of Interior and Department of Statistics at different levels and finally issued by the National Bureau of Statistics. Since each flood disaster event is associated with a specific flood of a given basin, so that the frequency of flood was adopted to identify the frequency of the associated flood disaster. 3. Flood management strategies 3.1 Flood management strategies The integrated approach to flood management in China is comprehensive and complex. While analyzing the flood management strategies one has to consider the basic fact, that is China has its huge population and is densely inhabited in limited flood prone areas in middle and down stream of seven major rivers. Despite the fact that China is short of water especially in north part of the country, however the conflict between the flood and inhabitants in these areas has been increasingly acute. This is partly due to rapid population growth during long historical period and partly due to the problems in flood management. For years the depressions, lakes and the flood plains were reclaimed by the settlers due to the 3 WMO/GWP Associated Programme on Flood Management pressure of population growth of adjacent areas.
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