Category Abbreviation Acid Deposition ACD Agriculture AG Climatological Processes CP Conservation COV Drought DROU Ecology ECL Economics ECON Education EDU Floods FL Geomorphological and Geochemical Processes G&G Groundwater GW Hydrogeochemistry HYDGEO Hydrology HYDROL Irrigation IG “Law, Institutions, and Policy” LIP Management and Planning M&P Methods MET Models MOD Nitrate Contamination NC Non-Point Pollution NPP Nutrients