Sustainable flood memories – defined as those formed of folk memories of flooding, flood heritage and other local, lay knowledges – have been identified as having great potential for increasing community resilience to floods. Focusing on the social and cultural aspects of flood and drought memory, we present the findings of archival research, interviews with residents of the Welsh colony in Argentine Patagonia (Y Wladfa in Welsh), and critical textual analysis of museum spaces. This analysis enables reconstruction of flood and drought history over the ~150 years of the colony, provides insights into the impact, emotive power and perception of floods and droughts, and highlights the ways in which lay knowledge and flood and drought memories are transmitted vertically and shared horizontally in material and immaterial ways. We argue that specific thresholds of memory exist, as related to flood/drought magnitude, duration, social impact and memorialisation, which ensure that some events are encoded, transcribed and transmitted through the collective memoria of a community, while other events may fade from memory. Ensuring long-term sustainability of the Welsh-language community, and integration of these flood/drought memories with those from other cultures and languages, will help develop community resilience to 21^st century hydroclimatic changes.

可持续洪水记忆-定义为由民间洪水记忆，洪水遗产和其他当地非专业知识构成的记忆-具有增强社区抗洪能力的巨大潜力。着眼于洪水和干旱记忆的社会和文化方面，我们介绍档案研究的结果，对阿根廷巴塔哥尼亚（Y Wladfa）威尔士殖民地居民的采访在威尔士语），以及对博物馆空间的批判性文本分析。该分析能够重建该殖民地约150年的洪水和干旱历史，提供对洪水和干旱的影响，情感力量和感知的见解，并突出说明垂直传播知识和洪水与干旱记忆的方式以及以物质和非物质方式横向共享。我们认为存在与洪水/干旱程度，持续时间，社会影响和纪念有关的特定记忆阈值，这些阈值可确保某些事件通过社区的集体回忆进行编码，转录和传播，而其他事件可能会从记忆中消失。确保威尔士语言社区的长期可持续性，^二十世纪的水文气候变化。