A. Florquin, H. Dentel, M. Gaultier, C. Ranchoux,

E. Rousseau, J. Tormos, T. Valois, S. Wardé

ERHASYAEntrepreneurial project RainwaterHArvesting SYstem Auroville

V. Borrell, S. Pistre, A. Richard, C. Batiot, F. Courant, M. Rousseau

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Team Organization

Project Leader

Anaïs Florquin

Hydrology

Anaïs Florquin

Emile Rousseau

Sociology

Jérémy TormosSerge Wardé

Health and Polution

Hélène DentelMaëllia Gaultier

Hydrogeology

Tiphaine ValoisCoralie

Ranchoux

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ERHASYA Team Members• Team Leader: Anaïs Florquin

Master 2 Water - HYDRE (Hydrology, Risks and Environment)

• Project Authority: Emile RousseauMaster 2 Water - HYDRE (Hydrology, Risks and Environment)

• Chief of staff: Serge Wardé Master 2 Water - Water and Society

• Communication Manager: Tiphaine ValoisMaster 2 Water - H3E (Qualitative and Quantitative Hydrogeology, and Environment)

• Assistant Communication Manager: Hélène DentelMaster 2 Water - Contaminants, Water and Health

• Assistant Communication Manager: Coralie Ranchoux Master 2 Water - H3E (Qualitative and Quantitative Hydrogeology, and Environment)

• Treasurer: Jérémy Tormos EspinozaMaster 2 Water - Water and Society

• Assistant Treasurer: Maéllia Gaultier Master 2 Water - Contaminants, Water and Health

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General Context

Before

After

1968Water resources : Underground Water- Domestic Water (collective fountains) - Industrial Water- Agricultural Water

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• Community based city

• Cosmopolitan (more than 50 nationalities)

• Particular economic system- Donations- Local activities

• No official water management structure

Socioeconomic context

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• Water treatment company: Aqua Dyn - Auroville

• Collective fountains 3 filtration systems:

Actual drinking water system

- Activated carbon- Sediments- Reverse osmosis

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Geological and hydrogeological context

Aquifers overexploitationDrop in groundwater levelSaltwater intrusion (proximity to Bengal

Bay)

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Water supply possibilities

How to guarantee a sustainable water supply in Auroville ?

Underground Water

Wastewater Rainwater Sea Water

Overexploited

Saltwater intrusion

- Significant volume available- Natural quality

Expensive treatment

Recycling and reuse, Difficulty to

sustain a good quality

level

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Drinking water supply via rainwater harvesting

Hydrogeological context

Drinking quality

Hydraulic Management

Characterization of Vanur, Cuddalore and Kadaperikuppam aquifers evolution

Cost-benefit analysis and

project governance

Is rainwater a sustainable and risk-free source of drinking water supply in Auroville?

Rainwater harvesting and supply network establishment

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Pumping Overexploitation

problem

Solution Rainwater harvesting

Storage Treatment

Supplying

Drinking water

supply to Auroville

Management

Drinking quality

Hydraulic

Hydrogeological context

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Example of rainwater harvesting system

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Saltwater intrusion evolution

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COMMENT APPROVISIONNER EN EAU POTABLE LA VILLE

D’AUROVILLE ?

cPhreatic level

evolution

Aquifers interactions and refill quantification

Hydrogeological context

Drinking water supply via rainwater harvesting

Characterization of Vanur, Cuddalore and Kadaperikuppam aquifers evolution

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Cost-benefit analysis

Cost estimations

Governance

Water management structure

Dialogue and participation dynamic

Positive externalities and profit-making possibilities

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Management

Drinking water supply via rainwater harvesting

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CBA

Gorvernance

Actual state of water

management

Effects and stakes of a joint rainwater harvesting

management

Equipment purchase/labour and installation

costs

Energy expenses/

maintenance

Consumption level characterization (per

capita, use or community)

Establishment of three scenarios

Estimation of avoided costs (agricultural

production)

Methodology

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Treatment process

• Standards• Efficiency

Is rainwater a sustainable and risk-free source of drinking water supply in Auroville?

Potability of harvested rainwater

• Contaminants assessment

• Pollution risks

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Maintain a good rainwater quality from its harvesting to its effective supply, while minimizing health risks.

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Water Quality

Drinking water supply via rainwater harvesting

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Rainwater quality and drinking water supply

Chemical quality of rainwater

Microbiological pollutantsChemical pollutants

Standards

Treatment process

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MethodologyRainwater harvesting system

- Storage- Materials

Main partner: Aqua Dyn - Auroville

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Sizing Supply methods

Technics and choice of methods

Estimation of costs

Rainwater harvesting and supply network

establishment

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Hydraulic

Drinking water supply via rainwater harvesting

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Methodology

Supply methods: Study of 3 scenarios (collective

fountains, individual fountains, double network) in socioeconomic terms

Management

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Sizing: Hydraulic formulas (hydrostatic,

linear and singular loads losses, etc.)

Materials characteristics (roughness)

Hydraulic courses and bibliography

Hydrological assessment:

Rain Evaporation

Estimation of costs: Materials prices Aqua Dyn fountain prices Restoration of actual

pipe network Management

Technics and materials choice: Sustainable and local materials etc. Profitability study of pico-turbines Bibliography and Auroville’s Future

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Feasibility study

Field Internship

Project follow-up

• Data• Bibliography• Rainwater harvesting system• Scenarios establishement• Estimation of costs

• Sampling• Modeling• Installation• Governance• Awareness

• Carrying out• Other field studies• Reproducibility

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- Integration of the project in the « Smarter Water Management » IBM program ?- IBM as a sponsor: support in financial search ?

logistics and materials support ?

ERHASYA IBM

- Environmental project in an underdevelopped country- Logo display-> Communication

- Technical support- Credibility

-> Management and counseling

BUSINESS PLAN

Besoins

Partenaires stratégiques Activités Clés

NeedsNew water resource

Change in consumption habits

Strategic Partnership

s

CSR

BRGM

Auroville

Aqua Dyn

Enactus

…

Key Activities

Skills transfers

Relationships

Problem solving

Offer

Rainwater harvesting

Treatment and filtration

Management and supply

Network

Auroville1000 Pionniers

EnactusGDF Suez

AIGEartht@lent

C@P…

Beneficiaries

Aurovilians

Surrounding villages

Impacts

Decrease in the pressure

on underground

water resources

Awareness

Better drinking

water access

Creation of a jointed

management structure

Relations

Awareness

Training

Key resources

MatérialsSofwaresFollow-up

Costs structure

TransportRent and food

Materials and softwaresAssociation creation

Communication campaign

Income

Project financing by Auroville

In search of funds for the analysis part

IBM

IBM

Feasibility study

Field internship

Project follow-up

Sponsoring

IBM?

Thank You For Your Time

Encadrants : C. Batiot-Guilhe, V. Borrell, F. Courant, A. Richard , M. Rousseau

A. Florquin, H. Dentel, M. Gaultier,C. Ranchoux, E. Rousseau, J. Tormos, T. Valois, S. Wardé,

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Contacts

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• Audrey Richard : Institut Français de Pondichéry• Frédérique Grelot : IRSTEA• Luigi Zanzi: Auroville Representative• Nina Graveline: BRGM Gironde• Toby Neuman: Auroville Water Service• Gilles Boulicot: CSR Director• Bhagwandas: Aqua Dyn Founder• RainDrop: Association• Thierry Ruiz: Lecturer in Génie des Procédés• Alexandre Boisson: Indo-French Centre for

Groundwater Research team manager / Hydrogeologist BRGM

• Nathalie Dorfliger: BRGM Bangalore• G. Muthusankar: Institut Français de Pondichéry

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ERHASYA Info

•« 1000 Pionniers » online contest finalists

•October 2013 ENACTUS Seminar in Nantes

•Growing address book of professionals

•Multiple financial sources considered

•Website: erhasya.e-monsite.com/en/