Menu
Home
Log in / Register
 
Home arrow Environment arrow Irrigation resources
Source

Water resources

Precipitation is the main source of renewable water supply. India receives a total annual rainfall of 400 km3 with a variation of 100 mm per annum in western most regions to 1100 mm per year in eastern region. The water resources of the country, which occur as natural runoff in the rivers, are estimated to be 18,697 km3 considering both ground water and surface water contributions. Due to various constraints of topography, distribution over time and space, 1,122 km3 water can be put to beneficial use, 690 km3 of which is due to surface water resources.

Irrigation potential

The total ultimate potential was earlier estimated at 113.8 million hectares, which has now been revised to 140 million hectares. The share of major and medium schemes that are surface water based is 58.5 million hectares, whereas that of minor schemes, based on surface water is 17.4 million hectares. The ground water based minor irrigation schemes are expected to contribute 64 million hectares compared with the earlier estimates of 40 million hectares.

Table 1. Cropped and irrigated areas from 1951 to 2008-09 in India

Year

Area (million hectare)

Net sown area

Gross sown area

Net irrigated area

Gross

irrigated area

1950-51

118.75

131.89

20.85

22.56

1960-61

132.20

152.82

24.66

27.98

1970-71

140.27

165.79

31.10

38.19

1980-81

141.93

176.75

40.50

51.41

1990-91

141.98

182.24

49.87

65.68

2000-01

141.10

187.94

54.68

75.14

2005-06

141.46

193.32

60.79

84.26

2008-09

141.36

195.10

63.20

88.42

 
Source
Found a mistake? Please highlight the word and press Shift + Enter  
< Prev   CONTENTS   Next >
 
Subjects
Accounting
Business & Finance
Communication
Computer Science
Economics
Education
Engineering
Environment
Geography
Health
History
Language & Literature
Law
Management
Marketing
Mathematics
Political science
Philosophy
Psychology
Religion
Sociology
Travel