2012 aif, d1s2 ppt evolution of irrigation practices - are large scale irrigation systems still...

8/2/2019 2012 AIF, D1S2 PPT Evolution of Irrigation Practices - Are Large Scale Irrigation Systems Still Relevant by Aditi Mukherji

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Evolution of irrigation practices: Are largescale irrigation systems still relevant?

Aditi Mukherji

Senior ResearcherIWMI

Evidence and arguments : Evolution of

irrigation

• From 1950s to 1990s, nature and form of irrigation haschanged from public canals to private groundwater

• Since 2000s, run away growth in groundwater hasslowed down

• What then are the implications of recent trends for largescale public irrigation systems?

Phases of irrigation in India

• Phase 1 ( till end 1960s): Public investments andlarge scale irrigation systems drove expansion inirrigated area

• Phase 2 (early 1970s to end 1990s): Privateinvestment in groundwater took over

• Phase 3 (since early 2000s): Slowdown in growth

in groundwater irrigation

Irrigated area in India by source: 1950to 2010

I r r i g a t e d

a r e a

1 0 0 0

Canal irrigated area Tank irrigated area Groundwater irrigated area

Since 1970s,groundwaterirrigated area hasincreased, as hasnumber of wells

and tubewells….

Why did groundwater irrigationovertake canal irrigation in 1970s?

• Green Revolution

– Canals were designed for 75% cropping intensity, not 200%

• Population growth and dwindling land sizes

– Farmers needed to grow multiple crops on same land

• Post colonial state’s revenue interest from irrigationdeclined

– As a result maintenance got routinely neglected

• New technologies and energy subsidies made pumpscheaper

– As a result farmers invested heavily in groundwater extraction

Groundwater providesreliability and flexibility –

something that farmersdemanded, but canals werenever designed to provide

But the groundwater juggernaut ofIndia is slowing down

5.5 million newpumps were

added between1987 to 1993

Almost 7.0 millionnew pumps wereadded between1994 to 2000

But only 1.2 millionpumps came upbetween 2001 to2007 and in somestates like West

Bengal, Bihar and

Jharkhand, absolutenumber of pumps

declined

Why is it slowing down? The east vs.the rest

• There is simply not enoughgroundwater

• This explains slow down

northern, western and southernIndia

• But not in eastern India where

groundwater availability is high

absolute size of groundwatereconomy has contracted

The energy irrigation nexus and theparadox of the East

• Low rates of pump electrification

• High diesel prices

• Low crop prices

• No public procurement system

• Poor roads and marketing

Therefore slow down in groundwatergrowth is a result of both resource and

policy constraint.

And this calls for suitably nuanced

responses

Revitalize Surface Irrigation: Deploy Surface Storage to

Minimize Power Subsidies and Carbon Footprint of Irrigation:

Deep groundwater areasare where large canal

systems operate

75-80 b kWh of power valued atUS $ 9.0 billion/year mostly in

deep groundwater pumping.

Surface storages can reducepower and carbon footprint:

Revitalize Irrigation Bureaucracy:Incentives, Accountability, Performance Mgt, Culture Change.

• Restructure governancesystems

• Unbundle irrigation agencies

• Benchmark performance

• Create incentives (better pay)

and accountability.

• Realistic ISF and 100%collection

Encourage Distributed Storage:Morph canal systems into Melon-on-vine systems

• To improve system flexibilityand reliability

• Rajasthan: farm-storages

• Gujarat, Tamilnadu, Andhra

Pradesh: village tanksreplenished by canal water

Invest in electricity and markets inareas of high groundwater potential

• High groundwater potential, high rainfall and naturalrecharge

• Farmer already pay high electricity tariffs andtherefore do not expect “free electricity”

• Food production in eastern India will ease pressure

on over-exploited aquifers and also promote growthin this poverty stricken region

Invest in electricity and markets in areas ofhigh groundwater potential

Thank you

For questions and comments, write toAditi Mukherji

a.mukherji@cgiar.org

Abundant groundwater and high naturalrecharge

Water tables

recover aftermonsoonrains

F hi h iff d l i i

Farmers pay high tariffs and electricitysubsidy is not an issue

0 20 40 60 80 100

Madhya Pradesh

Haryana

Gujarat

Andhra Pradesh

Karnataka

Rajasthan (Transco)

Tamil Nadu

Punjab

Maharashtra

U.P (Power corp)

West Bengal

Percentage

Electricitysubsidy is

negligible ineastern India

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