Related by context. Frequent words. (Click for all words.) 60 nutrient loading 56 nonpoint source pollution 55 TMDLs 55 TMDL 54 nutrient runoff 53 groundwater basins 53 groundwater recharge 53 dissolved solids 52 total dissolved solids 52 sewage discharges 52 effluent discharge 51 silts 51 aquifer recharge 51 nutrient pollution 51 salinity 51 pollutions 50 dischargers 50 pollutants 50 groundwater 50 pollution 50 groundwater pumping 50 aquatic ecosystem 50 alkalinity 49 acidifying 49 hydrological cycle 49 dissolved oxygen 49 nitrogen phosphorus 49 deplete oxygen 49 IWRM 49 dissolved oxygen levels 49 sewage effluent 49 absorptive capacity 49 sedimentation 49 bioaccumulation 49 ecologic 48 suspended solids 48 eutrophication 48 greenhouse gases GHGs 48 watersheds 48 exceedances 48 productivities 48 pollutants emitted 48 SO2 emissions 48 mussel species 48 heavily polluted 48 methyl mercury 48 polluted runoff 47 wellfields 47 environmental impacts 47 reservoirs 47 channelization 47 outfalls 47 nitrous oxides 47 rivers 47 river basin 47 stormwater runoff 47 irrigated agriculture 47 watercourse 47 preindustrial levels 47 greenhouse gases GHG 47 ecological 47 wastewater discharges 47 hydrology 47 nutrient 47 tributary streams 47 exceedance 47 ecological degradation 47 freshwater ecosystems 47 airshed 47 shoreline erosion 47 navigable waterways 47 river basins 47 groundwater extraction 47 silting 47 intermittent streams 47 streamflow 47 transboundary 46 pollutant emissions 46 aquifers 46 creeks rivers 46 contaminants 46 nitrobenzene 46 denitrification 46 glacial melting 46 underground aquifers 46 wastewater discharge 46 Menindee Lakes 46 freshwater 46 pollutant 46 tidal wetlands 46 nutrient absorption 46 tributaries 46 effluents 46 sediment runoff 46 hydrologic 46 combined sewer overflows 46 effluent 46 CO2 sequestration 46 tidal marshes 46 atmospheric CO2 46 watercourses