Colorado River Streamflow Analysis

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To analyze the need for a pulse flow in the lower Colorado River, we assessed the historical streamflow data of the Colorado River. We first created a time series, Figure 3, of the streamflow of the Colorado River below the Yuma Main Canal in Arizona, which is a few miles upstream from where the pulse flow was added at the Morelos Dam. Each data point represents the monthly mean streamflow rate (discharge rate) in cubic feet per second, from 1963 to 2016, as reported by the United States Geological Survey (USGS, 2017). The red linear trend line in Figure 3 shows the overall trend in the streamflow rate during this time period. To further our analysis of the history of Colorado River streamflow, we prepared a histogram, Figure 4, to determine
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