Related by context. Frequent words. (Click for all words.) 56 reservoir 55 magma chamber 54 aquifer 52 aquifers 52 underground aquifer 51 groundwater 49 sediment 49 watercourse 48 lakebed 48 Floridan Aquifer 48 Edwards Aquifer 48 sumps 47 basin 47 Aquifer 47 Creek tributary 46 water 46 sump 46 cavern 46 cistern 45 karst 45 aquifer recharge 45 subsurface 45 slurry 45 creek 45 streambeds 45 Escarpment 45 groundwater basin 45 silty 44 escarpment 44 tailing ponds 44 geologic formation 44 evaporation ponds 44 Ogallala Aquifer 44 seepage 44 piping 44 rock formations 44 sedimentation 44 underground aquifers 44 Groundwater 44 coal seam 43 unnamed tributary 43 Seepage 43 penstock 43 limestone 43 silt 43 creekbed 43 pipe 43 oxbow 43 streambed 43 graben 43 fracking fluid 43 waterline 43 temperature gradient 43 earth crust 43 artesian wells 43 seeps 43 basalt 43 Sediment 43 flume 42 reservoirs 42 caverns 42 brine 42 magma 42 geologic formations 42 tributary 42 Raw sewage 42 Sediments 42 sediments 42 wetland 42 Anticline 42 rainwater 42 alluvium 42 riverbed 42 polluted groundwater 42 sedimentary rock 42 lava tube 42 limestones 42 sandstone 42 trench dug 41 aqueduct 41 dewatering 41 dam spillway 41 ridge 41 meltwater 41 contaminated groundwater 41 earthen walls 41 carbonic acid 41 wellfield 41 subsidence 41 sewer pipes 41 dam 41 swale 41 shale 41 basins 41 Earth crust 41 kerogen 41 lowermost 41 artesian 41 Salinity 41 seawater 41 groundwater recharge