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The paper reflects the main methodological aspects of the PAPRIKA Project based on the following objectives: (i) to contribute to a more accurate assessment of glacier retreat, snow cover and climate change in Koshi Basin, Nepal; (ii) to have a better understanding of the contribution of glacier and snow melting to water availability; (iii) to correlate the results with local people's perceptions of climate change and their socio-economic impact. For this, the paper:highlights the fact that the water used by the population comes from different origins (glacier melting, snow melting, frost, rain) the combination of which varies between the four main landscape units: high, middle and low mountains, and finally the Terai plain;describes the methodology adopted to observe and analyse current as well as future environmental changes in the atmosphere, cryosphere and hydrosphere;shows that, for each origin, different reasons may explain the changes in water availability, and thus the impact on agriculture and the different water usages.DOI: http://dx.doi.org/10.3126/hn.v11i1.7197 Hydro Nepal Special Issue: Conference Proceedings 2012 pp.12-17

(Népal) qui nous a apporté son aide tout au long de ce programme ; Harka Bahadur Majhi qui a accompagné la plupart des missions sur le terrain ainsi que Dawa Nuru Sherpa pour la haute montagne et Manisha Rai pour les basses montagnes, ils ont tous trois assuré la traduction pour les étudiants ; les relecteurs qui nous ont permis d'améliorer ce texte. Cet article a été finalisé après les séismes du 25 avril et du 12 mai au Népal qui ont fait des milliers de victimes et engendré des dégâts considérables : nous avons une pensée toute particulière pour tous les Népalais avec lesquels nous avons travaillé sur le terrain.

The authors would especially like to thank the members of the PAPRIKA team (ANR-09-CEP-005-05/PAPRIKA) without whom these disciplinary interactions would not have been possible and who encouraged the encounter between geography and hydrology and subsequent exchanges, and also the members of the PRESHINE project (ANR 13-SENV-0005-01 and ANR-13-SENV-0005-02) during which this dynamic was maintained. Similarly, the authors address a huge thank you to the Nepalese who accompanied them during their fieldwork throughout the research programme, and in particular the hydrologist and researcher Devesh Koirala and field assistants Harka Bahadur Majhi and Dawa Nuru Sherpa. Finally, special thoughts go to all the villagers of Pangboche who kindly opened their doors to us and who shared their feelings in spite of their initial reticence. The PAPRIKA and PRESHINE projects were funded by the French National Research Agency (ANR).