Related by context. Frequent words. (Click for all words.) 57 aquifer recharge 57 groundwater 56 aquifers 55 groundwater basin 54 aquifer 53 underground aquifers 52 underground aquifer 52 groundwater recharge 51 Edwards Aquifer 51 groundwater pumping 51 Floridan Aquifer 51 wastewater 50 hydrologic 49 Aquifer 49 Ogallala Aquifer 49 Groundwater 49 wellfield 49 reservoirs 48 drainage basins 47 Edwards Aquifer Authority 47 watersheds 47 reservoir 46 water 46 overpumping 46 subsurface 46 polluted groundwater 46 sediment 46 NRDs 45 irrigated farmland 45 headwaters 45 polluted runoff 45 streamflow 45 GBRA 45 treated effluent 45 evaporation ponds 44 headwater 44 saltwater intrusion 44 basin 44 basins 44 wells 44 Mokelumne 44 contaminate groundwater 44 stormwater retention 44 drainage basin 43 hydrogeology 43 soils 43 river basin 43 nutrient loading 43 SFWMD 43 geologic formations 43 silty 43 Creek tributary 43 frac sand 43 irrigate 43 River basin 43 River Basin 43 MMWD 43 retention basins 42 contaminating groundwater 42 sewage discharges 42 hydrology 42 Water Reclamation 42 Irrigation District 42 streambeds 42 desalinization 42 stormwater runoff 42 streamflows 42 sediments 42 Watershed Protection 42 wastewater treatment 41 BexarMet 41 river basins 41 SNWA 41 sedimentation 41 detention basins 41 Water Reclamation Facility 41 Nacimiento 41 nonpoint source pollution 41 Anticline 41 stormwater 41 wastewater discharges 41 Great Artesian Basin 41 Alcosan 41 freshwater 41 groundwater extraction 41 hydrogeological 41 subsoil 41 EBMUD 41 PCWA 41 Swiftmud 41 septics 41 sandy soils 41 Apalachicola Chattahoochee Flint 40 graywater 40 diking 40 TMDLs 40 tributary streams 40 nutrient runoff 40 draining 40 total dissolved solids 40 sediment runoff