Related by context. Frequent words. (Click for all words.) 81 reservoir 70 dams 68 aquifers 67 river basins 65 basins 64 aquifer 62 Reservoir 61 lakes 61 groundwater 60 basin 60 watersheds 59 rivers 58 river basin 57 ponds 57 dam 57 water 57 wells 56 storages 55 catchments 55 tributaries 55 River basin 54 freshwater 54 hydropower plants 54 hydrological 53 headwaters 52 Water Resources 51 irrigation 51 Dams 51 impoundments 51 tributary 51 desalination plants 50 hydropower 50 hydroelectric dams 50 storage tanks 50 canals 50 creeks 50 wastewater 50 snowpack 49 waterways 49 watercourses 49 snowmelt 49 catchment 49 hydroelectric plants 49 River Basin 48 lake 48 water mains 48 aqueduct 48 wetlands 48 Water Supply 48 drainages 48 Water Treatment Plant 48 hydroelectric 48 irrigators 48 hydro electric power 48 sewage 48 megalitres 48 retention ponds 48 cfs 47 spillway 47 lagoons 47 Dam 47 Groundwater 47 sewage treatment 47 wetland 47 coal seams 46 estuaries 46 sediment 46 pipelines 46 sedimentation 46 hydro electric 46 dammed 46 salinity 46 dikes 45 brackish water 45 estuary 45 weir 45 upstream 45 rainfall 45 cisterns 45 wastewater treatment 45 boat ramps 45 wells drilled 45 Reclamation 45 rainfalls 45 potable water 45 watershed 45 desalination plant 45 catchment areas 45 hydroelectricity 45 effluent 44 sewerage 44 rainwater 44 drainage 44 soils 44 irrigate 44 silt 44 freshwater lake 44 flood plains 44 Water 44 floodplains 43 oilfields