mainstreaming groundwater in urban planningarghyam.org/wp-content/uploads/2013/07/...himanshu...
TRANSCRIPT
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MAINSTREAMING GROUNDWATER IN
URBAN PLANNING
Himanshu Kulkarni
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GROUNDWATER
SANITATION
WATER SUPPLY
Groundwater: source & sink
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The larger picture
• Global estimate: more than 1.5 billion urban dwellers rely on groundwater, currently
• Dependence on groundwater, especially in “developing cities”: – Population growth
– Rapid urbanisation – city sprawl
– Increased per-capita use
– Higher ambient temperatures
– Reduced reliability of intakes, especially from rivers
– Demand & supply factors
– Modest cost of water-wells (especially in India!)
• Conundrum of depleting groundwater and deteriorating quality (sanitation, solid and liquid wastes)
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Hues of groundwater exploitation
CGWB, 2006
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Salinity,
Fluoride
Iron, Arsenic,
Fluoride
Modified after:
Krishnan, 2009
Salinity,
Fluoride
Groundwater quality
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Water sector, groundwater and urban WSS
• OVERALL WATER SECTOR
– Changing approaches to WR Planning in India - significant inputs from a
wider net of organisations on various aspects in the water sector
– Consideration to wide-ranging scales in attempting reform – major
irrigation projects to Rural WSS (habitation level)
• URBAN WATER & SANITATION
– Importance of water – sanitation, sewage, wastewater links
– Challenges with respect to sewerage
– Dichotomy of equitability wrt to water and waste: Water for all is more
easily accepted but we are unable to deal with the waste-of-all
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Groundwater in the urban space
Core
New city
Peri-urban
Rural
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Urban groundwater – 2 scenarios
Fully groundwater dependent
Groundwater supplements river imports
Groundwater use already mainstreamed in operation –
but seldom part of Urban Water Planning
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NIA, surface water & groundwater
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1950s 1960s
1970s 1980s
1990s 2000s Decade-wise trend of shares of groundwater and
surface water to NIA - an aggregated National Picture
Groundwater
Surface water
Source: Indian Agricultural Statistics, 2008
Would be
interesting to look
at a similar
comparison in the
Urban context
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Urban groundwater: common issues Foster et al, 2010: GW-MATE
• Modification of groundwater cycle on account of urbanisation
• Many problems around groundwater are predictable, few are predicted
• Conceptual hydrogeological model not constant – needs continuous modification
• Two major consequences: • Paradox of urban recharge – tradeoff between reduction in infiltration-
facilitative surfaces and leaking mains and sewers
• Contaminant loading of sub-surface systems – improper sanitation, poor sewerage and haphazard waste-disposal
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Aquifer setting – the missing dimension
Is this constant or uniform….?
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Diversity
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Crystalline / Basement Rocks
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Volcanic rocks
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Alluvium
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Consolidated sedimentary rocks
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Himalaya
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Carbonate rocks / limestones
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Multiple / compounded
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From generics…
ARGOSS, 2001: BGS, UK
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…to specifics (wrt sanitation)
ARGOSS, 2001: BGS, UK
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Mainstreaming
• Comprehensive understanding of groundwater resources (aquifers) required
• Information on sources, usage, impacts (especially recharge and quality)
• Logic of including groundwater in the formal civic water supply system – Examine whether such a move will take the pressure off
individualistic access to groundwater
– Link regulation and licensing to assured water supply and equitability
– Without major improvements in sanitation, sewerage, recycling and treatment, one cannot assure security of water supply and sustainability of groundwater resources
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Advanced Center for Water Resources Development and Management (ACWADAM) Plot 4, Lenyadri society, Sus road, Pashan, Pune-411021.
020-25871539;
Email: [email protected]
Website: www.acwadam.org