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POVERTY REDUCTION STRATEGY TN

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Year<br />

Table 5.5: Net Sown, Gross Area and Irrigation Intensity in Tamil Nadu<br />

(‘000 hectares)<br />

Net Area<br />

Irrigated<br />

(NAI)<br />

Gross Area<br />

Irrigated<br />

(GAI)<br />

Net<br />

Area<br />

Sown<br />

(NAS)<br />

Gross<br />

Cropped<br />

Area<br />

(GCA)<br />

Irrigation<br />

Intensity<br />

(percent)<br />

Cropping<br />

Intensity<br />

(percent)<br />

NAI as<br />

Percent<br />

of NAS<br />

GAI as<br />

Percent<br />

of GCA<br />

1970-71 2592 3410 6169 7384 131.56 119.7 42.02 46.18<br />

1980-81 2570 3294 5360 6469 128.17 120.69 47.95 50.92<br />

1990-91 2373 2894 5578 6632 121.96 118.90 42.54 43.64<br />

2000-01 2887 3490 5303 6338 120.89 119.52 54.44 55.06<br />

2001-02 2801 3412 5172 6226 121.81 120.38 54.15 54.80<br />

2002-03 2310 2622 4590 5191 113.51 113.10 50.30 50.50<br />

2003-04 2148 2479 4689 5316 115.40 113.40 45.81 46.63<br />

2004-05 2637 3087 5097 5889 117.06 115.54 51.74 52.42<br />

2005-06 2919 3397 5244 6033 116.37 115.05 55.66 56.31<br />

2006-07 2889 3416 5126 5843 118.24 113.98 56.36 58.46<br />

Source: Tamil Nadu - An Economic Appraisal (various issues).<br />

Approximately 55 percent of the net irrigated area is irrigated by well water and<br />

the remaining by canals, tanks and other sources such as streams and springs. The net<br />

irrigated area increased by about 11.5 percent during 1970-71 to 2006-07 mainly due to<br />

increase in area irrigated by wells (Table 5.6).<br />

Table 5.6: Net Irrigated Area by Source of Irrigation<br />

(‘000 hectares)<br />

Year Canal Tank Wells Others Total<br />

1970-71 862 902 787 41 2592<br />

1980-81 889 590 1067 24 2570<br />

1990-91 769 531 1059 14 2373<br />

2002-03 614 422 1263 11 2310<br />

2003-04 449 385 1299 15 2148<br />

2004-05 754 465 1400 18 2637<br />

2005-06 800 575 1537 7 2919<br />

2006-07 782 531 1566 9 2889<br />

Source: Tamil Nadu - An Economic Appraisal (various issues).<br />

More than 85 large and medium dams have been constructed since<br />

independence. As the surface irrigation potential has been virtually exhausted,<br />

modernizing/rehabilitating existing systems is crucial to improve the efficiency of surface<br />

irrigation in the state. Most of the canals in the state are old and have very poor<br />

efficiency as a result of seepage and silting in the canals. In recent years, the state has<br />

undertaken some major canal modernization projects with the aide of World Bank<br />

106

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