Timeseries: Anthropocene - Grand Canyon Be Dammed

A heatmap of streamflow downstream from the Glen Canyon Dam at USGS gage 09402500 in the Grand Canyon. The heatmap shows within year variation in streamflow from 1920 to 2020, and how this has changed with the construction of the Glen Canyon Dam, There is natural variability throughout the year until 1963 when the Glen Canyon Dam began impounding water to fill Lake Powell. After that, the streamflow showed much more seasonal changes as the dam and water releases were controlled by water managers.

This chart type is similar to the raster hydrograph made by Koehler (2004).

Created by Margaret Jaenicke