11-10 IRRIGATION, RESERVOIRS, FLOOD
PREVENTION, WATER AND SOIL CONSERVATION AND IMPROVEMENT OF SALINE-ALKALINE LAND |
Item |
1985 |
1990 |
1993 |
1994 |
1995 |
|
|
|
|
|
|
Number of Irrigation Systems (year-end) |
5281 |
5363 |
5567 |
5523 |
5562 |
33 001 Hectares
Over |
71 |
72 |
74 |
74 |
74 |
7 001-33 000
Hectares |
66 |
76 |
92 |
98 |
99 |
Effectively Irrigated Areas (10 000 ha) |
2077.7 |
2123.1 |
2448.3 |
2235.3 |
2249.9 |
33 001 Hectares
Over |
599.6 |
604.7 |
623.9 |
628.8 |
631.4 |
7 001-33 000
Hectares |
167.0 |
189.6 |
231.8 |
242.9 |
244.4 |
Number of Reservoirs |
83219 |
83387 |
84614 |
84558 |
84775 |
Large |
340 |
366 |
374 |
381 |
387 |
Medium |
2401 |
2499 |
2562 |
2572 |
2593 |
Small |
80478 |
80522 |
81678 |
81605 |
81795 |
Capacity of Reservoirs (100 000 000cu.m) |
4301 |
4660 |
4717 |
4751 |
4797 |
Large |
3076 |
3397 |
3425 |
3456 |
3493 |
Medium |
662 |
690 |
709 |
713 |
719 |
Small |
564 |
573 |
583 |
582 |
585 |
Total Area Subject to Flooding (10 000 ha) |
2420.7 |
2446.7 |
2442.5 |
2442.5 |
2442.5 |
Area with Flood Prevention Measures (10 000 ha) |
1858.4 |
1933.7 |
1988.3 |
1997.9 |
2006.5 |
Percentage to
Total Area Liable to Flooding (%) |
76.8 |
79.0 |
81.4 |
81.8 |
82.2 |
Total Area of Water Loss and Soil Erosion (10 000 sq.km) |
129.2 |
136.0 |
163.0 |
163.0 |
163.0 |
Area with Water and Soil Conservation Measures (10 000 sq.km) |
46.4 |
53.0 |
61.3 |
64.1 |
66.9 |
Percentage to
Total Area of Water Loss and Soil Erosion (%) |
35.9 |
39.0 |
37.6 |
39.3 |
41.0 |
Total Area of Saline-Alkaline Land (10 000 ha) |
769.3 |
753.9 |
765.6 |
765.6 |
765.6 |
Improved Area of Saline-Alkaline Land (10 000 ha) |
456.9 |
499.5 |
530.5 |
535.1 |
543.4 |
Percentage to
Total Area of Saline Alkaline Land (%) |
59.4 |
66.3 |
69.3 |
69.9 |
71.0 |
Total Length of Dikes and Levies (10 000 km) |
17.7 |
22.0 |
24.5 |
24.6 |
24.7 |
Land Protected by Dikes and Levies (10 000 ha) |
3106.0 |
3200.0 |
3088.5 |
3024.6 |
3060.9 |
|
|
|
|
|
|
a) Capacity for Large reservoirs are over 100 000 000 cu.m, for medium reservoirs
are from 10 000 000 to
100 000 000
cu.m, for small reservoirs are from 100 000 to 10 000
000 cu.m.