Fig. 4.

Modeling results of flood event-based terrace erosion and sediment and Hg efflux from the Yuba Fan. (A) Terrace erosion modeling results show fine-sediment flux (Qs) produced solely by terrace failure during the three largest recent floods above a streamflow (Q) threshold (SI Methods). (B) National Aeronautics and Space Administration 1997 flood image. Bright colors indicate high reflectance by suspended sediment. (C) Modeled SSC for the 1997 flood peak captures the turbid signal in the actual flood image. Red circles indicate Feather/Yuba confluence on both images. Total event Qs and Hg and associated model uncertainties are propagated based on the SD of Q-Qs regression at the model boundary.