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13-10  Irrigation, Reservoirs, Flood Prevention, Water and Soil Conservation and Improvement of Saline-Alkaline Land
  Item
1990
1995
2000
2002
2003
  Number of Irrigation Areas at the year-end (set)
5363
5562
5683
5691
5729
  33 000  Hectares and Over               
72
74
101
110
112
  20 000-33 000  Hectares                 
76
99
141
168
169
  Effective Irrigated Areas (10 000 hectares)             
2123.1
2249.9
2449.3
2503.0
2524.4
  33 000  Hectares and Over               
604.7
631.4
788.3
915.8
938.1
  20 000-33 000  Hectares                 
189.6
244.4
344.0
407.2
408.4
  Number of Reservoirs                   
83387
84775
85120
85288
85153
  Large                                  
366
387
420
445
453
  Medium-sized                           
2499
2593
2704
2781
2827
  Small                                  
80522
81795
81996
82062
81873
  Capacity of Reservoirs (100 million cu.m)
4660
4797
5184
5595
5658
  Large                                  
3397
3493
3842
4229
4278
  Medium-sized                           
690
719
746
767
783
  Small                                  
573
585
594
597
597
  Water-saving Irrigated Area (10 000 hectares)
1638.9
1862.7
1944.3
  Flooded or Waterlogged Area (10 000 hectares)
1933.7
2006.5
2098.9
2109.7
2113.9
  Area of Soil Erosion under Control 
5300
6690
8096
8541
8971
  (10 000 hectares)
         
         
  Improved Area of Saline-Alkaline Land  
499.5
543.4
584.1
528.3
586.5
  (10 000 hectares)
         
         
  Total Length of Dikes       (10 000 km)
22.0
24.7
27.0
27.4
27.8
  Area of Land Protected by Dikes        
3200.0
3060.9
3960.0
4286.2
4387.5
  (10 000 hectares)                    
  a) The capacity of the large reservoirs is over 100 million cubic meters, while that of the medium ones is from 10 million to 100 million cubic
    meters, and that of the small ones is from 100 000 to 10 million cubic meters.
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