About IRHA

The International Rainwater Harvesting Alliance is a Swiss Non-Governmental Organization founded in 2002 and based in Geneva.

IRHA's mandate is to promote rainwater as an effective and sustainable solution to water scarcity and climate extremes due to climate change.

The IRHA implements rainwater harvesting development projects in developing countries to improve the health, livelihoods, and resilience of communities and ecosystems in the face of change. climatic.

As such, the initiatives of the IRHA are fully in line with the achievement of the Sustainable Development Goals (SDGs 1, 2, 4, 5, 6, 11,13, 15 and 17).


  • A world where communities vulnerable to climate change are able to guarantee access to water, cover their basic needs and benefit from the conditions necessary for sustainable development.


  • Support human communities and ecosystems to better manage available resources and become more resilient to change
  • Invest in sustainable development strategies that respect ecological balances and zero carbon
  • Cultivate people's sensitivity to their environment, their indigenous knowledge to define contextualized responses that are quickly appropriated by them.


Our action is based on the implementation of rainwater management projects in developing countries where access to drinking water and vulnerability to climate change are daily problems, directly and negatively impacting community life. Our intervention revolves around 3 components:

  • implementation of projects
  • Capacity Building
  • support for the development of an integrated natural resource management policy.

We offer our partners:

  • Expertise to plan, develop and build stormwater management systems and operationally demonstrate the benefits of this resource.
  • Decision-making tools to provide local decision-makers with the tools necessary for the proper management of infrastructures and to ensure the sustainability of investments.
  • Training to strengthen the technical and management capacities of local decision-makers, and technical services and young professionals (students in civil engineering, architecture, etc.).
  • Support for the development of local and regional policies/strategies for the conservation and management of water resources, in order to strengthen resilience and the capacity to adapt to climate change.

Focus on impact

We pay great attention to monitoring/evaluating the performance of our projects with our local partners, to developing contextualized solutions based on a detailed understanding of needs. Results-based project management, monitoring of indicators and achievement of objectives, allows us to better perceive the impact of our interventions on the basis of quantifiable results.

The impact of our actions since 2002 is: + 1,184,000 people benefiting daily from drinking water resources, + 140 rainwater collection tanks, + 200 school gardens, 64 schools and 9 health centers in 14 countries of intervention.



Marc Sylvestre - Director

Marc holds a Master's degree in Urban Development (IUG, 2007) and an MSc in Water and Environmental Management (WEDC- Loughborough, 2020). He has managed numerous development projects in Lebanon, Haiti and Nepal. He is responsible for the strategic and operational development of the organization, contributes to the deployment of new initiatives and is in charge of fundraising and donor relations (foundations, institutions, private, etc.).

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Arnaud Bourgeois - Admin & Finance


Florian Bielser - Programme Manager

Graduated from Environmental Sciences and Engineering from the Ecole Polytechnique Fédérale de Lausanne (EPFL), Florian joined IRHA in 2019. Passionate about low-tech solutions, sustainable and easily appropriated by communities, he is currently coordinating projects on food sovereignty and ecosystem restoration in Nepal and Senegal.


Marion Dunand - project officer

With a Master's degree in African Studies at the University of Geneva (UNIGE) as well as in International Program Management at the Institute of International and Strategic Relations (IRIS), Marion joined IRHA as an intern in January 2022. She first worked on the Global Rainwater Harvesting Index and then was responsible for the strategic strengthening of the Alliance. She is now responsible for sensibilisation projects in Switzerland and knowledge sharing at the Alliance level.

> Linkedin


Darja Könnig PhD - Resource mobilization

Passionate scientific professional with a strong track record in cutting-edge research in regenerative
medicine and clinical trials management. For over 15 years, Darja proved to be a resilient and collaborative partner, capable of building strong relationships with stakeholders and delivering timely results.
Darja joined IRHA as resource mobilization officer.




The Committee defines the policy of the organization and ensures the promotion of the organization towards institutions, donors and other agencies.

Committee Member



IRHA's strategy defines the organization's intervention framework, objectives and results to be achieved. The strategy specifies the areas of intervention, the modus operandi in order to develop, implement and evaluate the impact of initiatives.
Documents are available upon request.

Stratégie 2022 > 2030

Annual report

New initiatives, impact, outcomes and challenges, our annual report assess the progress of the IRHA.



Your support is key


Name: IRHA
Account: 17-198970-3
IBAN: CH15 0900 0000 1719 8970 3

Recognised as a public utility, your donations to the IRHA are tax deductible.



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International Environment House 2
Chemin de Balexert, 9
CH-1219 Châtelaine

Tel. : +41 22 797 41 57
E-mail : secretariat@irha-h2o.org

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