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Tank Irrigation in Semi-Arid Tropical India Economic Evaluation and Alternatives for Improvement

Authors
Publisher
International Crops Research Institute for the Semi-Arid Tropics
Publication Date
Keywords
  • Watershed Management
  • Agriculture-Farming
  • Production
  • Technology
  • Economics
Disciplines
  • Agricultural Science
  • Ecology
  • Economics
  • Geography

Abstract

RA 00121.pdf Tank Irrigation in Semi-Arid Tropical India Economic Evaluation and Alternatives for Improvement Abstract Resume von Oppen, M . , and Subba Rao, K.V. 1987. Tank Irr igat ion in Semi-Ar id Tropical India: Economic Evaluation and Alterna- tives for Improvement. Research Bulletin no. 10. Patancheru, A.P. 502 324, India: International Crops Research Institute for the Semi-Arid tropics. A survey of 32 tanks and farm data f rom Andhra Pradesh and Maharashtra states was used to assess the economic perfor- mance of irr igation tanks in S A T India. Distr ict data on cl i- matic and Insti tut ional variables were used to analyze the factors affecting tank-irr igation density. Results indicate that the spatial distr ibut ion of i rr igat ion tanks is determined primari ly by physical factors—hard rock substratum, postmonsoon rains, low moisture-holding capacity of soils—and by populat ion density. Tank irr igat ion, formerly a source of relative stability, has become a source of instability for agricultural product ion in many parts of India. Important factors for the decline in tank irr igt ion are: environmental degradation such as deforestation, soil erosion, si l tation, tankbed cult ivat ion, and lack of adminis- trative setup to provide timely repair and maintenance of tanks, and to ensure proper water control and tank management. Simulat ion results show that wi th improved water control and by keeping sluices closed on rainy days, a 20% larger command area can be irrigated. A Tank Irr igat ion Author i ty is proposed for better water control and management. Another concept proposed is Composite Watershed Management on Alfisols involving a system of runoff- and erosion-controll ing land management for enhanced groundwater recharge and sus- tained well i rr igation. This concept, analyzed at I C R I S A T Center in a modeling exercise, has considerable economic potential. von Oppen, M. et Subba Rao, K.V. 1987. (Res

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