Nutrient patterns and export in streamflow were determined for a 7.4-km2 agricultural hill-land watershed located in Pennsylvania. P export, whether associated with sediment or water phase, was dominated by storm periods. About 70% of water phase P was exported during the 10% of time defined as storm flow. P export during storms becomes less controlled by water phase P as the P fraction being exported is expanded from labile P (50--70%) to algal-available P (20--40%) to total P (10--20%). Water phase P accounted for 25--50% of the algal-available P exported in total flow. Nitrate export was mostly in nonstorm periods (60%) with the higher concentrations in elevated base flows. The elevated base flow appears to result from increased drainage from a shallow fracture layer that underlays cropland. Because storm periods dominate P export, control of the hydrologically active P source areas within the watershed provides the greatest opportunity for controlling export of algal-available P. ¿ American Geophysical Union 1996