“…This wide range in β indicates that some stream networks extend dramatically as catchments become wetter, while others remain nearly fixed in place ( Figure 1). For example, subsurface transport capacity can be sensitive to valley slope (Jensen et al, 2018;Whiting & Godsey, 2016;Wondzell, 2011), sediment size (Costigan et al, 2016;Wondzell, 2011), tectonic structures (Kennedy et al, 1984;Whiting & Godsey, 2016), and river behavior (e.g., incision versus aggradation; Costigan et al, 2016), but attempts to quantitatively relate these properties to stream network dynamics are rare. For example, subsurface transport capacity can be sensitive to valley slope (Jensen et al, 2018;Whiting & Godsey, 2016;Wondzell, 2011), sediment size (Costigan et al, 2016;Wondzell, 2011), tectonic structures (Kennedy et al, 1984;Whiting & Godsey, 2016), and river behavior (e.g., incision versus aggradation; Costigan et al, 2016), but attempts to quantitatively relate these properties to stream network dynamics are rare.…”