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.



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


Read more


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

Read more


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


Festival Ficamazonia

Friday June 26 at 3:00 pm we had the chance to exchange with Jani Silva President of the Association of sustainable integral development Perla Amazónica "ADISPA" Perla Amazónica peasant reserve area and Norberto Villalobos Vice President AMCOP peasant reserve area Pato river basin and Balsillas valley

See more


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.

Read More


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).

Read More


Alternatiba Festival 2019 at the Parc des Bastions!: (14 Sept., Geneva, Switzerland)

Read more


Caux Dialogue on Land and Security 2019. 'Landscapes, People and Ecosystems' (27-29 Jun., Caux, Switzerland)

Read more


Novatech Conference. 'Water in the City' (1-5 July 2019, Lyon, France)

Read More


'Rain Water Harvesting, livelihood and Ecosystems' (28 July 2019, Kathmandu, Nepal)



'Water Security through Rain water harvesting' (27-29 Nov. 2018, Colombo, Sri Lanka)

Read more


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


They support us