Related by context. Frequent words. (Click for all words.) 67 aquifers 67 groundwater 67 aquifer 62 underground aquifer 62 underground aquifers 61 Floridan Aquifer 59 Aquifer 59 aquifer recharge 58 groundwater pumping 57 reservoirs 57 Ogallala Aquifer 57 groundwater recharge 57 groundwater basin 56 water 55 reservoir 55 Groundwater 55 wellfield 53 watersheds 52 irrigated farmland 51 total dissolved solids 51 polluted groundwater 51 irrigated agriculture 51 evaporation ponds 51 Edwards Aquifer 50 streamflow 50 wastewater 50 sedimentation 50 freshwater 50 drainage basins 50 upstream reservoirs 49 injection wells 49 nonpoint source pollution 49 contaminating groundwater 49 basin 49 contaminated groundwater 49 River basin 49 sediment 49 river basins 49 MtBE 49 frac sand 48 chloramine 48 wastewater treatment 48 fracking fluids 48 artesian wells 48 headwaters 48 basins 48 wastewater discharge 48 CO2 sequestration 48 soils 48 hydrologic 48 treated effluent 48 turbidity 48 Great Lakes basin 47 subsurface 47 floodplain 47 rivers 47 wells 47 River Basin 47 freshwater mussels 47 potable 47 contaminants 47 dewatering 47 alluvial deposits 47 saltwater intrusion 47 wastewater discharges 47 river basin 46 fracking fluid 46 GBRA 46 contaminate groundwater 46 drainage basin 46 sewage discharges 46 watercourse 46 Edwards Aquifer Authority 46 geologic formations 46 bottomlands 46 coalbed methane 46 potable water 46 Lake Tenkiller 45 streambeds 45 subsoil 45 artesian 45 nutrient loading 45 finite resource 45 geologic 45 mgd 45 streamflows 45 nitrate 45 groundwater contamination 45 hydrological 45 hydrogeology 45 Controlled burns 45 dissolved solids 45 effluent discharge 45 Mullaperiyar dam 45 coal seams 45 coal slurry 45 wetlands 45 arsenic contamination 45 arsenic 45 ash ponds 45 diking