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13-10Irrigation, Reservoirs, Flood Prevention, Water and Soil Conservation and Improvement of Saline-Alkaline Land Item 1990 1995 2000 2003 2004 2005 Number of Irrigation Areas at the year-end(set) 5363 5562 5683 5729 5800 5860 33 000Hectares and Over 72 74 101 112 111 117 20 000-33 000Hectares 76 99 141 169 169 170 Effective Irrigated Areas(10 000 hectares) 2123.1 2249.9 2449.3 2524.4 2550.6 2641.9 33 000Hectares and Over 604.7 631.4 788.3 938.1 971.4 1023 20 000-33 000Hectares 189.6 244.4 344.0 408.4 405.7 408 Number of Reservoirs 83387 84775 85120 85153 85160 85108 Large-scale Reservoir 366 387 420 453 460 470 Medium-scale Reservoir 2499 2593 2704 2827 2869 2934 Small-scale Reservoir 80522 81795 81996 81873 81831 81704 Capacity of Reservoirs(100 million cu.m) 4660 4797 5184 5658 5542 5624 Large-scale Reservoir 3397 3493 3842 4278 4147 4197 Medium-scale Reservoir 690 719 746 783 796 826 Small-scale Reservoir 573 585 594 597 599 602 Water-saving Irrigated Area (10 000 hectares) 1638.9 1944.3 2034.6 2133.8 Flooded or Waterlogged Area(10 000 hectares) 1933.7 2006.5 2098.9 2113.9 2119.8 2133.9 Area of Soil Erosion under Control 5300 6690 8096 8971 9200 9465 (10 000 hectares) Improved Area of Saline-Alkaline Land 499.5 543.4 584.1 586.5 596.2 603.2 (10 000 hectares) Total Length of Dikes(10 000 km) 22.0 24.7 27.0 27.8 27.7 27.7 Area of Land Protected by Dikes 3200.0 3060.9 3960.0 4387.5 4393.4 4412.0 (10 000 hectares) a) The capacity of the large-scale reservoir is over 100 million cubic meters, while that of the medium-scale one is from 10 to 100 million cubic meters, and that of the small-scale one is from 100 000 to 10 million cubic meters.

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