Upper Lake Mary Watershed Monitoring Program
The Water Services Division is interested in snowpack and summer precipitation patterns. The graph, above, shows a shift from the historical annual rain-to-snow relationship. In the last 4 of 16 water years, our annual precipitation has gone from about 50%–70% rain to 80% rain, with only 20% of all precipitation falling as snow. Production staff have seen significant runoff into Upper Lake Mary when rain falls on snowpack. A warming climate is a concern for many Southwestern water providers that rely on winter snowpack to recharge their surface supplies. Utilities will incorporate this and other climate scenario planning into its next Water Resources Master Plan.
Flowtography & "Watching Our Watershed"
In 2015, the Water Services Division partnered with the Salt River Project (SRP) to provide ongoing operations, maintenance, and data collection for six Flowtography sites within the 4FRI (Four Forests Restoration Initiative) area of the Upper Lake Mary Watershed. The six sites were installed in November 2014. Two additional sites were installed in April 2017 at the Newman Canyon USGS gage site and Upper Lake Mary to monitor water levels. Flowtography uses a game camera mounted in a tree to take one photo every 15 minutes of a graduated rebar stake in the center of a channel. The channel has been surveyed for slope, cross-sectional area, and roughness such that flow can be calculated using the Manning’s equation. The height of water on the stream gage is recorded from photographs taken during flow events. The flow data will serve as a baseline for comparison with data collected after forest treatments. They will help us determine whether forest treatment and maintenance affect surface water runoff into Upper Lake Mary.
Learn how Flagstaff uses Flowtography to preserve our water supply.
Time Lapse Videos of Monitoring Sites
The Water Services Division and two other groups — the Flagstaff Watershed Protection Plan Project and the Lake Mary Walnut Canyon Technical Advisory Committee — partnered with the U.S. Geological Survey to install a flow gage and sediment sampler in Newman Canyon in 2014. Newman Canyon is the largest single contributing tributary to Upper Lake Mary. The image on the right displays:
- Sub-watersheds of the Walnut Creek Watershed
- Watersheds that are part of the Upper Lake Mary Watershed Monitoring Project and NAU Paired Watershed Study
- USGS Newman Canyon Gage and Sediment Sampler