More importantly, the R2 values between
QMAX trends and precipitation extreme trends are less
than 0.2 across all precipitation extreme metrics. This result means
that the spatial variation of precipitation extreme trends can explain
less than 20% of the spatial variation of QMAX trends
across the CONUS from 1980 to 2014. The R2 calculated
over individual water resources regions (Figure 2e; also see Figure S2
of the Supporting Information) also indicates a low correlation.
Specifically, more than 60% of the regions having an
R2 value of less than 0.2, indicating the limitation
of using trends of precipitation extremes to infer trends of
floods.