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12-9 Irrigation,
Reservoirs, Flood Prevention, Water |
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and Soil Conservation
and Improvement of Saline-Alkaline Land |
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Item |
1985 |
1990 |
1995 |
1998 |
2000 |
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Number of Irrigation Areas (year-end) |
5281 |
5363 |
5562 |
5611 |
5683 |
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33 000 Hectares and Over
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71 |
72 |
74 |
79 |
101 |
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20 000-33 000 Hectares
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66 |
76 |
99 |
114 |
141 |
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Effective Irrigated Areas (10 000
hectares)
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2077.7 |
2123.1 |
2249.9 |
2274.6 |
2449.3 |
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33 000 Hectares and Over
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599.6 |
604.7 |
631.4 |
669.1 |
788.3 |
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20 000-33 000 Hectares
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167 |
189.6 |
244.4 |
276.9 |
344 |
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Number of Reservoirs
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83219 |
83387 |
84775 |
84994 |
85120 |
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Large
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340 |
366 |
387 |
403 |
420 |
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Medium-sized
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2401 |
2499 |
2593 |
2653 |
2704 |
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Small
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80478 |
80522 |
81795 |
81938 |
81996 |
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Capacity of Reservoirs (100 million
cu.m) |
4301 |
4660 |
4797 |
4924 |
5184 |
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Large
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3076 |
3397 |
3493 |
3597 |
3842 |
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Medium-sized
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661 |
690 |
719 |
736 |
746 |
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Small
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564 |
573 |
585 |
591 |
594 |
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Water-saving Irrigated Areas (10 000
hectares) |
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1523.5 |
1638.9 |
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Flooded or Waterlogged Area
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1858.4 |
1933.7 |
2006.5 |
2068.1 |
2098.9 |
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Area of Soil Erosion under
Control |
4640 |
5300 |
6690 |
7502 |
8096 |
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(10 000 hectares) |
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Improved Area of Saline-Alkaline
Land |
456.9 |
499.5 |
543.4 |
565.3 |
584.1 |
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(10 000 hectares) |
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Total Length of Dikes (10 000
km) |
17.7 |
22.0 |
24.7 |
25.8 |
27.0 |
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Area of Land Protected by Dikes |
3106 |
3200 |
3060.9 |
3629.0 |
3960 |
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(10 000 hectares) |
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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, |
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and that of the small ones is
from 100 000 to 10 million cubic meters. |
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