Why do farmers build reservoirs?

Why do farmers build reservoirs?

Boulder's run-off peaks in June. However, crops need most of their water in July and August. Early settlers soon learned that ditches, especially junior ditches with short seasons, were not able to supply crops with water when needed. So by the 1880s, settlers started building reservoirs to store the run-off for use later in the season.

Photo of corn at McKenzie Farms, Boulder, courtesy of John McKenzie.

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