Related by context. Frequent words. (Click for all words.) 63 groundwater basin 61 reservoirs 61 aquifers 61 aquifer 61 reservoir 60 wellfield 60 groundwater 58 underground aquifer 58 artesian wells 57 evaporation ponds 56 underground aquifers 56 aquifer recharge 55 groundwater recharge 55 drainage basins 55 water 55 groundwater pumping 55 groundwater basins 55 Floridan Aquifer 54 groundwater extraction 54 coalbed methane wells 54 wells 53 frac sand 53 sewage effluent 53 wastewater 52 retention basins 52 sediment 52 polluted groundwater 51 sanitary sewage 51 tributary streams 51 diking 51 dewater 51 injection wells 51 detention basins 50 irrigated farmland 50 sewage lagoon 50 dam spillway 50 sedimentation 50 sumps 50 diked 50 stormwater retention 50 saltwater intrusion 50 basin 50 watersheds 50 treated effluent 50 dewatering 49 Edwards Aquifer 49 wastewater treatment 49 Potable water 49 dewatered 49 Ogallala Aquifer 49 headwaters 49 Aquifer 49 overpumping 49 Truckee Canal 49 sewer mains 49 Groundwater 49 reinjection 49 contaminating groundwater 48 storage caverns 48 dredged material 48 basins 48 mgd 48 Creek tributary 48 watermains 48 mill tailings 48 silts 48 unnamed tributary 48 streambeds 48 Pueblo Reservoir 48 drainage 48 contaminated groundwater 48 frac fluid 48 gpd 48 sewer 47 headwater 47 wellbores 47 glacial till 47 Reservoirs 47 hydrogeological 47 Reservoir 47 Lake Lavon 47 waterlines 47 clarifiers 47 sewage discharges 47 unappropriated 47 brine 47 watercourse 47 potable water 47 drainage basin 46 polluted runoff 46 Dewatering 46 roadbeds 46 melting snowpack 46 upstream reservoirs 46 septic systems 46 sewage 46 freshwater 46 river basin 46 sandy loam 46 untreated wastewater 46 contaminate groundwater