Related by context. Frequent words. (Click for all words.) 62 aquifers 61 underground aquifers 60 aquifer 59 groundwater 58 Floridan Aquifer 57 reservoirs 57 underground aquifer 55 reservoir 55 wellfields 54 groundwater basin 53 injection wells 53 groundwater basins 53 basin 52 basins 51 magma chamber 51 Ogallala Aquifer 51 water 51 Utica shale 51 geologic formation 50 alluvial deposits 50 Aquifer 50 coalbed methane wells 50 headwater streams 50 aquifer recharge 50 salt domes 50 artesian wells 49 groundwater extraction 49 geologic formations 49 headwaters 49 drainage basins 49 alluvium 49 sedimentary basin 49 polluted groundwater 49 lakebed 48 sedimentary basins 48 Sediments 48 streambeds 48 watersheds 48 sandy soils 48 Bakken shale 48 freshwater 48 sewage effluent 48 wells 48 thermocline 48 glacial till 48 River basin 48 tributary streams 47 groundwater pumping 47 brine 47 contaminated groundwater 47 wellfield 47 frac sand 47 sediment 47 Groundwater 47 overpumping 47 river basins 47 tidal wetlands 47 lakes 47 marine sediments 46 subsurface 46 groundwater recharge 46 contaminating groundwater 46 Bakken formation 46 melting snowpack 46 brackish water 46 evaporation ponds 46 wastewater 46 artesian 46 Madrid Seismic Zone 46 surficial 46 Yegua 45 peridotite 45 MtBE 45 sandstone reservoirs 45 sediments 45 areal extent 45 continental crust 45 dissolved solids 45 mountain snowpack 45 coulees 45 Albany Shale 45 graben 45 coal seams 45 river basin 45 brackish 45 Bakken Formation 45 fracking fluid 44 drainage basin 44 geological formations 44 sedimentary rock 44 depositional 44 tailing ponds 44 hydrogeologist 44 Geologic Survey 44 mud volcanoes 44 brines 44 Edwards Aquifer 44 Paradox Basin 44 igneous rock 44 freshwater mussels 44 snowpacks