Related by context. Frequent words. (Click for all words.) 61 salination 61 groundwater aquifers 61 aquifers 59 shallow aquifer 59 groundwater 57 aquifer 57 underground aquifer 57 salinity 57 Murrumbidgee River 56 sewage effluent 56 Soil erosion 55 groundwater recharge 55 water 54 soils 54 watercourse 54 Great Artesian Basin 54 catchments 53 underground aquifers 53 Poyang Lake 53 silts 53 Warragamba Dam 53 siltation 53 Salinity 52 riverbed 52 Aquifers 52 groundwater extraction 52 sedimentation 52 lakebed 52 sediment 52 streambeds 51 catchment 51 waterholes 51 Sutlej river 51 silt 51 stormwater drains 51 rainwater 51 silting 51 Ghaggar 51 seabeds 51 sewerage pipes 51 reservoir 51 soil erosion 51 reservoirs 51 waterbody 51 inter tidal 51 rivers 50 evaporation ponds 50 rotting vegetation 50 tailing ponds 50 aquifer recharge 49 waterbodies 49 Mithi river 49 basin 49 river 49 coastland 49 sumps 49 peat bogs 49 saltwater intrusion 49 wellfields 49 Subsidence 49 subsidence 49 drainage basins 49 Menindee Lakes 49 Great Dividing Range 49 ponds 49 lake 49 monsoonal rains 49 wetland ecosystems 49 koala habitat 49 effluent discharge 49 creeks rivers 49 irrigated agriculture 49 effluent 48 clay soils 48 wetland 48 embayment 48 stormwater drain 48 paddy cultivation 48 streambed 48 overgrazed 48 Clutha River 48 intermittent streams 48 river deltas 48 Floridan Aquifer 48 lakeshores 48 watercourses 48 Encroachments 47 cumecs 47 freshwater 47 brackish water 47 creek 47 Groundwater 47 groundwater basin 47 Godavari river 47 catchment areas 47 polluted runoff 47 tributary streams 47 croplands 47 river embankments 47 moorlands 47 seawaters