Related by context. Frequent words. (Click for all words.) 56 aquifers 55 wellfields 54 Soil erosion 53 overpumping 53 groundwater 53 Aquifers 53 salination 52 aquifer 52 semi arid regions 51 groundwater aquifers 51 underground aquifers 51 groundwater pumping 50 shallow aquifer 50 aquifer recharge 50 arid regions 49 contaminate groundwater 49 groundwater basin 49 underground aquifer 49 groundwater basins 49 water 49 acidify 49 reservoirs 48 Parched 48 lakeshores 48 irrigated farmland 48 Salinity 48 saltwater intrusion 48 groundwater withdrawals 48 overgrazed 48 groundwater recharge 48 wastewater effluent 48 sandy soils 47 Groundwater 47 sewage effluent 47 red legged frogs 47 Drought stricken 47 irrigated crops 47 semiarid 47 Potable water 47 semi arid 47 freshwater 47 Stormwater runoff 47 Everglades Agricultural 47 contaminating groundwater 46 acidic soils 46 Nacimiento 46 irrigated 46 desalting 46 Floridan Aquifer 46 groundwater extraction 46 Soil moisture 46 Polluted 46 Hetch Hetchy Reservoir 46 fertile soils 45 arsenic concentrations 45 reservoir 45 Omo River 45 nutrient loading 45 Sheep Creek 45 wellfield 45 arid lands 45 Aquifer 45 arid 45 artesian wells 45 riparian vegetation 45 Georgina Basin 45 Reservoirs 45 irrigate crops 45 Seepage 45 Suisun Marsh 45 soils 44 treated effluent 44 silts 44 Cachuma 44 periodic droughts 44 ecologically sensitive areas 44 chaparral covered 44 inter tidal 44 headwater 44 polluted runoff 44 Great Artesian Basin 44 Acidic 44 evaporation ponds 44 warmer wetter 44 septics 44 placer deposits 44 seabeds 44 severe droughts 44 Edwards Aquifer 44 coalbed methane wells 44 polluted groundwater 44 Melting glaciers 44 polluted 44 Elephant Butte 44 Arid 44 wastewater 44 Turbidity 43 nutrient runoff 43 intensively farmed 43 Lake Lavon 43 salinity