Despite being situated in the Sonoran Desert of southern Arizona, Tucson is no stranger to floods. The city only receives 12 in. of rainwater a year, but much of it is concentrated during the July to October monsoon season. Tucson’s largest ever flood, in 1983, was caused when 7.5 in. of rain dropped on the city in the span of five days. By some accounts, the flooding destroyed 1,300 homes, displaced 10,000 people, and killed more than a dozen.

Older parts of Tucson don’t have drainage channels, storm drains, or detention basins, according to Jacob Prietto, CFM, the chief hydrologist of

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