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Tamil Nadu Agricultural University (2011)

Threshold water conservation in a selected agricultural watershed

Maheshwara Babu B.

Titre : Threshold water conservation in a selected agricultural watershed

Auteur : Maheshwara Babu B.

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Soil and Water Conservation Engineering 2011

The present study was taken up in Hirekere watershed which is draining to Krishna river through Nallavagu stream and is located near Singanodi and Mandalgeri villages in Raichur district of Karnataka with objective of finding the threshold water conservation in the watershed area. The physiography is gently sloping. The normal annual rainfall of the study area is 632 mm. The mean temperature varies from 23.000 C in December to 32.950 C in May. The soil is covered by Alfisols of red sandy loam. The Hirekere watershed has basically granite terrain. In this study, rainfall analysis was done for 35 years data from 1975 to 2009. The annual rainfall ranged from 132.9 mm (1997) to 1471.2 mm (1975). The analysis revealed that the distribution was erratic and not dependable on monthly basis owing to the need of small water harvesting structures like farm pond. A rainfall trend analysis was made by Mann- Kendall test to see any change in trend of annual rainfall and also 1 day maximum rainfall due to climate change for 35 years data from 1975 to 2009. It was observed that there is decreasing in trend in annual rainfall and increasing trend for 1 day maximum rainfall. It was observed that the annual rainfall showed decreasing trend for the period from 1981 to 1990 and for the last two decades, i.e. from 1991 to 2000 and from 2001 to 2010 there was an increasing trend in the annual rainfall when compared with the study on long duration of 35 years (1975 to 2009) where it was decreasing. The meteorological drought analysis showed that 19 years (54%), 9 years (26%), 4 years (11%) and 3 years (9%) out of 35 years (1975 - 2009) of study period were coming under no drought, mild drought, moderate drought and severe drought respectively. The length of growing period (LGP) on an average is 25.21 weeks which was observed from the rainfed crops. The intercropping system by integration of one-long duration crop (cotton, caster, pigeonpea) and one short duration crop (groundnut, sunflower) could be recommended for the study area. First week of July instead of June can be considered for sowing. Morphometric analysis was carried out for determining the various morphometric parameters. All the morphometric parameters were found to be favourable for water conservation (farm ponds) in the watershed area.

Présentation et version intégrale (Shodhganga)

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