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Up-scaling potential impacts on water flows from agricultural water interventions: opportunities and trade-offs in the Osman Sagar catchment, Musi sub-basin, India

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Relation http://oar.icrisat.org/6094/
http://dx.doi.org/10.1002/hyp.9516
 
Title Up-scaling potential impacts on water flows from agricultural water interventions: opportunities and trade-offs in the Osman Sagar catchment, Musi sub-basin, India
 
Creator Garg, K K
Wani, S P
Barron, J
Karlberg, L
Rockstrom, J
 
Subject Watershed management
 
Description Agricultural water management (AWM) has been shown to improve and secure yields in the
tropics and has been suggested as an important way to combat poverty in the region. In this
paper we describe potential impacts on upstream and downstream flows of extensive AWM
interventions, using the watershed development programme of the Osman Sagar catchment of
Musi sub-basin, Andhra Pradesh semi-arid India, as an example. Various AWM interventions
are compared with a non-intervention state and the current state of the study area, using 31-
years of data by application of the calibrated and validated ARCSWAT 2005 (Version 2.1.4a)
modelling tool. Different AWM interventions contribute to improved livelihoods of upstream
smallholder farmers by increasing soil moisture availability and groundwater recharge, which
can subsequently be used for irrigation. The result is higher crop production and hence larger
incomes. Moreover, lower flow intensities and sediment losses reduced by 30-50 %, reduce
the risk of flooding and sediment accumulation in the Osman Sagar drinking water reservoir.
On the other hand, AWM interventions are predicted to result in reduced total water inflows
to the Osman Sagar reservoir from 11 % of the total annual rainfall (754 mm) recorded at
present, to 8 % if AWM interventions were implemented at large scale throughout the
catchment. A cost-benefit analysis of AWM interventions showed that the highest net
economic returns were achieved at intermediate intervention levels (only in-situ AWM).
 
Publisher John Wiley & Sons
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6094/1/2012_Gargetal_OS.pdf
Garg, K K and Wani, S P and Barron, J and Karlberg, L and Rockstrom, J (2012) Up-scaling potential impacts on water flows from agricultural water interventions: opportunities and trade-offs in the Osman Sagar catchment, Musi sub-basin, India. Hydrological Processes, 27 (26). pp. 3905-3921. ISSN 0885-6087