12-9 Irrigation, Reservoirs, Flood Prevention, Waterand Soil Conservation and Improvement of Saline-Alkaline Land
Item
1990
1995
2000
2001
2002
Number of Irrigation Areas at the year-end (set)
5363
5562
5683
5686
5691
33 000 Hectares and Over
72
74
101
108
110
20 000-33 000 Hectares
76
99
141
169
168
Effective Irrigated Areas (10 000 hectares)
2123.1
2249.9
2449.3
2476.6
2503.0
33 000 Hectares and Over
604.7
631.4
788.3
861.7
915.8
20 000-33 000 Hectares
189.6
244.4
344.0
405.4
407.2
Number of Reservoirs
83387
84775
85120
85136
85288
Large
366
387
420
433
445
Medium-sized
2499
2593
2704
2736
2781
Small
80522
81795
81996
81967
82062
Capacity of Reservoirs (100 million cu.m)
4660
4797
5184
5281
5595
Large
3397
3493
3842
3927
4229
Medium-sized
690
719
746
758
767
Small
573
585
594
595
597
Water-saving Irrigated Area (10 000 hectares)
1638.9
1744.6
1862.7
Flooded or Waterlogged Area (10 000 hectares)
1933.7
2006.5
2098.9
2102.1
2109.7
Area of Soil Erosion under Control
5300
6690
8096
8154
8541
(10 000 hectares)
Improved Area of Saline-Alkaline Land
499.5
543.4
584.1
575.1
528.3
(10 000 hectares)
Total Length of Dikes (10 000 km)
22.0
24.7
27.0
27.3
27.4
Area of Land Protected by Dikes
3200.0
3060.9
3960.0
4067.1
4286.2
(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.
