The first large-scale water supply in Britain was not for potable domestic supplies, but for the canal network, the arteries of the industrial revolution. This paper examines how episodes of dry weather in the late eighteenth and early nineteenth centuries, reconstructed from early instrumental sources, impacted the developing canal network. Analysis reveals how a frequent lack of preparedness for even relatively minor drought events resulted in conflict between water users, with potentially serious socioeconomic consequences. The economic pressure of compensating other users for loss or reduction of their water supply resulted in canal companies investing in technologies and management techniques that continue to be used today as drought mitigation strategies, such as the building of large-capacity reservoirs and groundwater abstraction. This period represents a key technological milestone in the development of the modern water supply systems, contextualising current challenges faced by the water industry in responding to drought events. Although the failure of the British canal system no longer has serious economic impacts, themes emerge from this research which are as relevant for water supplies today as they were in the eighteenth century, such as issues around water rights and the value of preparing for potential future extreme weather scenarios. A newly reconstructed composite precipitation series for Chatsworth House is presented (1760-present). Through comparing weather records within the archives of canal companies and their competitors for water supplies, historical insight can be gained into the possible far-reaching societal impacts of drought.

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Abstract. To date few studies have reconstructed weather from personal diaries (also known as private diaries). In this paper, we consider different methods of indexing daily weather information, specifically precipitation, from eighteenth and nineteenth-century personal diaries. We examine whether there is a significant correlation between indexed weather information and local instrumental records for the period, thereby assessing the potential of discursive materials in reconstructing precipitation series. We demonstrate the potential for the use of diaries that record weather incidentally rather than as the primary purpose, and the value and utility of diaries covering short periods when used alongside nearby contemporary diaries. We show that using multiple overlapping personal diaries can help to produce a more objective record of the weather, overcoming some of the challenges of working with qualitative data. This paper demonstrates indices derived from such qualitative sources can create valuable records of precipitation. There is the potential to repeat the methodology described here using earlier material or material from further away from extant instrumental records, thereby addressing spatial and temporal gaps in current knowledge globally.

We would like the thank the referee for reviewing the paper, and for their useful and constructive comments. We are glad that they consider the content of the paper to be sound. We are happy to incorporate their suggestions into the revised manuscript and will accordingly consider relevant non-European literature. We will add more detail where suggested in the methodology and will revise our figure captions.

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