12-29
Irrigation, Reservoirs, Flood Prevention, Water and Soil Conservation and
Improvement of |
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Item |
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1985 |
1990 |
1995 |
1997 |
1998 |
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Number of Irrigation
Areas (year-end) |
5281 |
5363 |
5562 |
5579 |
5611 |
33 000 Hectares and Over |
71 |
72 |
74 |
77 |
79 |
20 000-33 000 Hectares |
66 |
76 |
99 |
115 |
114 |
Effective Irrigated
Areas (10 000 hectares) |
2077.7 |
2123.1 |
2249.9 |
2249.5 |
22746 |
33 000 Hectares and Over |
599.6 |
604.7 |
631.4 |
640.8 |
669.1 |
20 000-33 000 Hectares |
167 |
189.6 |
244.4 |
286.2 |
276.9 |
Number of Reservoirs |
83219 |
83387 |
84775 |
84837 |
84994 |
Large |
340 |
366 |
387 |
397 |
403 |
Medium-sized |
2401 |
2499 |
2593 |
2634 |
2653 |
Small |
80478 |
80522 |
81795 |
81806 |
81938 |
Capacity of Reservoirs
(100 million cu.m) |
4301 |
4660 |
4797 |
4583 |
4924 |
Large |
3076 |
3397 |
3493 |
3267 |
3597 |
Medium-sized |
661 |
690 |
719 |
729 |
736 |
Small |
564 |
573 |
585 |
587 |
591 |
Watersaving Irrigated
Areas (10 000 hectares) |
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|
1523.5 |
Jetting Irrigation |
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|
159.5 |
Dropping Irrigation |
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14.2 |
Pipeline Transportion |
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|
523.2 |
Flooded or Waterlogged
Area |
1858.4 |
1933.7 |
2006.5 |
2052.6 |
2068.1 |
Under Control
(10 000 hectares) |
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Area of Soil Erosion
Under Control |
4640 |
5300 |
6690 |
7224.2 |
7502.2 |
(10 000 hectares) |
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Improved Area of |
456.9 |
499.5 |
543.4 |
561.2 |
565.3 |
(10 000 hectares) |
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Total Length of
Dikes
(10 000 km) |
17.7 |
22 |
24.7 |
25.1 |
25.8 |
Area of Land Protected
by Dikes |
3106 |
3200 |
3060.9 |
3414.6 |
3629.0 |
(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 millio |