[1] We estimated long‐term annual evapotranspiration (ETQ) at the watershed scale by combining continuous daily streamflow (Q) records, a simplified watershed water balance, and a nonlinear reservoir model. Our analysis used Q measured from 11 watersheds (area ranged from 12 to 1386 km) from the uppermost section of the Neuse River Basin in North Carolina, USA. In this area, forests and agricul...