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Water for a food-secure world

K.Palanisami

Drivers of canal irrigation performance: Use of Data and Measurement methods from Three major Projects in Tamil Nadu, India

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Water for a food-secure world

Fig 1:Schematic framework of methodologyPerformance Indices (based on review & consultation

Data Collection

Quantification & analysis of Indices

Linking the indices with performance

Identification of drivers of success of canal irrigation

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Fig 2. Location of the Projects

Parambikulam-Aliyar Project

Lower Bhavani Project Tambraparani Project

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Performance measures and Drivers (1995-2010)No. Particulars PAP (172256 ha) LBP (83980 ha) TP (138616 ha)

1 Performance measures 1.1 % of target area irrigated 97 89 761.2 Water productivity ( kg/m3 )

Rice 0.43 0.42 0.44Sugarcane 8.90 12.0 -Coconut (nuts/ m3 ) 3.762 - 1.39Maize 3.98 3.45 -Groundnut 1.13 1.46 0.54Cotton 0.40 - 0.31

1.3 Average profit ( Rs/ha) 30932 19327 109401.4 Average profit ( Rs/m3)

4.7 3.8 1.8

2 Possible drivers2.1 Water availability( m3/ha) 10248 12940 116242.2 % of WD met by canal supply 41.6 54.4 33.92.3 % of WD met by ER 16.0 20.0 14.22.4 % of WD met by GW 42.3 25.5 51.8

2.5 % area under water saving methods 42.8 7.1 112.6 % of water saving using WSIT 19 4.8 2.7

2.7 Water allocation pattern Turn Turn Conti 2.8 Water availability index 7.3 7.8 4.62.9 Ratio of rice and non-rice crops 1:2.9 1:1.3 2:1

2.10 Best performing WUA (% ) 32 45 9

Data analysed : 1995-2010

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Performance of the Projects

S.No. Projects TFP change Remarks

1 LBP 0.996 DEA-Malmquist

approach2 PAP 0.935

3 TP 0.889

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TFP River Basins

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Drivers of canal irrigation performance (% area irrigated) using Generalised Linear Model

Project Variable Nature of effect

LBPwater allocation index Positive

water availability index Positive

% Area under water saving tech Negative

PAP

Rainfall PositivePercentage canal water supply NegativePercentage ground water supply Positivewater allocation index Negativewater availability index PositivePercentage crop diversification Negative

Percentage Area under water saving tech PositivePercentage O&M staff increase Positive

TP

Percentage ground water supply Positivewater allocation index Negativewater availability index NegativePercentage crop diversification PositivePercentage Active WUA PositivePercentage O&M staff increase Positive

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Possible Follow ups

• Selection of the region/state• Collection of data for all the M&M projects• Derive various indicators• Run the models• Identify and rank the key drivers

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Thank you