Related by context. Frequent words. (Click for all words.) 81 reservoirs 67 Reservoir 64 dam 63 Reservoirs 63 aquifer 60 basin 59 aquifers 59 lake 58 tributary 57 groundwater 57 water 56 spillway 55 watercourse 55 weir 55 dams 55 wells 54 dike 54 Aquifer 54 wellbore 53 Dam 53 basins 53 river basin 53 earthen dam 52 ponds 52 headwaters 52 aqueduct 52 upstream 52 lakes 52 hydrologic 52 river 51 sediment 51 cofferdam 51 downstream 50 Water Treatment Plant 50 Wivenhoe Dam 50 river basins 50 Ogallala Aquifer 50 cfs 50 flume 50 hydrological 50 creek 50 underground aquifers 50 outfall 49 rivers 49 River tributary 48 sump 48 groundwater pumping 48 freshwater lake 48 Pumping Station 48 Creek Reservoir 48 mgd 48 wastewater 48 pond 48 dammed 48 River basin 48 wetland 48 sedimentation 48 Treatment Plant 48 canal 48 creeks 47 sewage 47 seawater 47 artesian 47 meltwater 47 subsurface 47 freshwater 47 dewatering 47 silt 47 Groundwater 47 cavern 47 dikes 47 spillways 47 coal seam 47 Lake Sakakawea 46 leachate 46 effluent 46 slurry 46 weirs 46 lagoons 46 inlet 46 seepage 46 tributaries 46 streambed 46 treated effluent 46 storage tanks 46 beaver dam 45 catchment 45 estuary 45 riverbed 45 tailings dam 45 sluice gates 45 frac 45 geologic 45 Tuolumne River 45 pipeline 45 fracture stimulation 45 wastewater treatment 45 drainage ditch 45 streamflow 45 wetlands 45 sandstones