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.