One of the primary objectives of GAPP is "To interpret and facilitate the transfer of the results of improved seasonal predictions to users for the optimal management of water resources." Toward this objective, the hydrology and water resources section of the GAPP science plan identifies six science questions that will be addressed through a set of activities organized around individual GAPP supported research projects, related non-GAPP research projects, related operational activities of the NWS hydrology program, and other activities of NASA, NOAA and other agencies. These activities are structured within parallel research and operational pathways, following the earlier successful GCIP model in the coupled modeling area. The operational pathway is implemented in the form of a GAPP funded NOAA Core Project led by NWS Office of Hydrologic Development (OHD), NWS/NCEP and NESDIS. The core project encompasses a list of activities that are oriented toward integrating GAPP research into operational models, implementation tools, and practical understanding required to make end-to-end prediction a reality in the water management field. The ultimate goal is to demonstrate that GAPP research can be used to produce "engineering quality" seasonal to interannual hydrologic forecast products that can be used in a reliable way as a basis for water management decisions. This presentation focuses on the hydrology and water resources component of the GAPP Core Project. Particularly, the status and progresses in six core project areas conducted by OHD are highlighted: (1) Collaborative activities with Scientific Community and NWS River Forecast Centers; (2) OHD activities in Land Data Assimilation System (LDAS); (3) highlights from OHD led Distributed Modeling Intercomparison Project (DMIP); (4) Model enhancement/upgrade to National Weather Service River Forecast System (NWSRFS) and NOAH Land Surface Model; (5) Atmospheric ensemble applications; (6) Hydrologic ensemble post-processor for water resources applications. A future GAPP Core project activity - National Hydrologic Long-Range Prediction System (NHLPS) - will be briefly discussed.