Water 1 Any land anywhere can be used to harvest rainwater
The fundamental reason: extend the fruits of the monsoon
The basic principle: Catch water where it falls
Water 2 Water Harvesting   watertop_06.jpg (1999 bytes)
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Statistics

Basinwise average annual runoff and utilisable flow of rivers (cubic kilometres)

River Average annual runoff in the river (a) Estimated utilisable flow excluding groundwater
Indus (up to border) 73.305 46
Ganga 501.643 250
Brahmaputra (at Jogigupa) 537.067 24
Barak and other rivers flowing into Meghna 59.8 -
Godavari 118.982 76.3
Krishna 67.79 58
Cauvery 20.957 19
Pennar 6.858 6.858
East flowing rivers between Mahanadi and Pennar 16.948 13.11
East flowing rivers between Pennar and Kanyakumari 17.725 16.732
Mahanadi 66.879 49.99
Brahmani and Baitarni 36.227 18.297
Subarnarekha 10.756 6.813
Sabarmati 3.812 1.925
Mahi 11.829 3.095
West flowing rivers of Kutch, Saurashtra including Luni 15.098 14.98
Narmada 40.95 34.5
Tapi 18 14.5
West flowing rivers from Tapi to Tadri 108.618 11.936
West flowing rivers from Tadri to Kanyakumari 89.25 24.273
Area of inland drainage in Rajasthan desert - -
Minor river basins draining to Bangladesh and Burma 31 -
Total 1,853.494 690.309
Notes:

a : The figures include observed flow as corrected for surface utilisation. The effect of actual utilisation of groundwater draft is not included

Source: Anon 1988, Water Resources of India, CWC Publication No 30/88, Central Water Commission, Government of India, New Delhi, pp 33 and 37.

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