Fig. 3.

Changes in riverine export fluxes of TP (A) and RP (B) to the coastal zone, relative to the corresponding 1970 values. Export fluxes are calculated by subtracting P retained by dam reservoirs in a watershed from the no-dam river P load predicted by the Global-NEWS-HD model. The 2030 scenarios with “no new dams” only account for retention by dams currently in the GRanD database, whereas the 2030 scenarios with “new dams” include the GRanD dams plus those planned to be completed by 2030, as compiled by Zarfl et al. (2).