Related by context. Frequent words. (Click for all words.) 72 aquifer 70 underground aquifer 69 aquifers 66 underground aquifers 64 groundwater 62 reservoir 62 reservoirs 61 water 60 wellfield 59 groundwater recharge 58 headwaters 58 Aquifer 57 watersheds 57 Edwards Aquifer 55 groundwater pumping 55 basin 55 Ogallala Aquifer 54 drainage basins 53 diking 53 catchments 53 watercourse 53 river basin 52 artesian 52 floodplain 52 retention basins 52 wetlands 52 freshwater 52 irrigation 51 basins 51 waterlines 51 Angat Dam 51 wetland 51 rivers 51 drainage basin 51 potable water 51 treated effluent 51 headwater 51 hydro dams 51 Groundwater 51 dams 51 tidal wetlands 50 submersible pumps 50 injection wells 50 saltwater intrusion 50 catchment 50 detention basins 50 tributaries 50 river basins 50 Reservoir 50 lakes 49 freshwater wetlands 49 wells 49 ponds 49 lake 49 drainages 49 outfall 49 irrigated agriculture 49 water mains 49 dam 49 sandy soils 49 waterbodies 49 tidal marsh 49 hydrologic 48 sediment 48 riparian 48 septic tanks 48 flood plain 48 streambeds 48 creek 48 wetland habitat 48 riparian habitat 48 storage tanks 47 irrigate 47 mgd 47 silt 47 hydrological 47 cistern 47 sewer mains 47 Creek tributary 47 drainage 47 sedimentation 47 hydrology 47 sumps 47 streambed 47 creeks 47 vegetation 47 bottomlands 46 sewage 46 sewage disposal 46 tree canopies 46 submersible pump 46 rainwater 46 weir 46 wastewater 46 irrigates 46 Reservoirs 46 lakebed 46 tributary 46 streamflows 46 septic systems 46 Mullaperiyar dam