The International Rainwater Harvesting Alliance (IRHA)

Rainwater harvesting: an effective and sustainable solution in the face of water shortages and floods, supporting ecosystems and communities.



The International Rainwater Harvesting Alliance (IRHA) is a Swiss based NGO, established in Geneva in 2002. Our association's mandate is to promote rainwater harvesting as an effective and sustainable solution in the face of water shortages, and to increase human communities resilience to the risk of natural hazards, including floods and droughts.


Our 2020 Annual Report presents the impact of IRHA's programmes: rainwater harvesting for WASH, climate resilient agriculture, integrated water resource management, disaster risk reduction and evidence-based advocacy.

2020 Annual Report

2020 Audit Report


Songlines Workshop - Charting Resurgence

Thursday 5th November 2020, 10:00 - 13:00

IRHA participates to the workshop: "Songlines, charting the cultivation of nature(s)". This workshop explores Songlines as a potential methodology for mapping holistic, nature-based adaptation projects on decadal timescales


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Festival Ficamazonia

Follow the FICAMAZONIA discussions and meet local actors that are everyday bringing solution and a change to what is currently happening in Amazonia.

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Community-led Nature Based Solutions for Adaptation: lessons for building back better from COVID-19

Thu Sep 24, 2020 12:00 PM - 1:30 PM

Friends of EbA, Rare, International Rainwater Harvesting Alliance, IIED, Forest Farm Facility (FFF)

This session will share practical stories on how community-led Nature-Based Solutions have helped vulnerable people cope better with and recover quicker from COVID-19. The discussions will focus on how supporting community-led NbS for adaptation can aid COVID-19 recovery policies.

Trailer IRHA

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Rainwater management in the city - Webinar @SmartWash

This Friday, August 11th at 10:15am, our President, Han Heijnen, will participate in the webinar series on rainwater harvesting @Smart Wash solutions, Kathmandu.

A special attention will be given on rainwater management in cities: Programme

Webinar 1

Webinar 2


IRHA join the Geneva Federation of cooperation

We are proud to join the Fédération Genevoise de Coopération. Today is an important step in the development of our association and the development of new initiatives in the field of rainwater management.

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Online Course _Water Harvesting & Micro-climate Management

IRHA supported Sony Pun (Nepal) and Blandine Barthod (France) in applying to participate in the 2020 online course, Rainwater and microclimates management, run by the Water Harvesting Lab (University of Florence).

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Latest News

Rainwater on Tap @RTS


International Rainwater Harvesting Alliance (IRHA)

International Environment House 2

Chemin de Balexert, 9 I 1219 Châtelaine, Geneva CH

T: +41 22 797 41 57




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


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