Understand the Future
Records show that over the past 500 years, there have been three extended periods of drought conditions, when both the Colorado River and Salt River watersheds received below-average precipitation for periods of 20 years or more. There were extended dry periods in the late 16th century, late 19th century, and in the post-war period. In contrast, the early 20th century was unusually wet.
Global climate change has the potential to impact the frequency and severity of water shortages. Long-term temperature increases in source watersheds could reduce precipitation. Of greatest concern is the possibility of reduced snow pack, which would mean reductions in the amount of water that flows into the storage reservoirs in the spring and summer months. More information on how the City plans to meet your water needs in the face of these challenges can be found in the 2021 Water Resource Plan.