Related by context. Frequent words. (Click for all words.) 73 saltwater intrusion 61 shoreline erosion 58 polluted runoff 58 salinity 58 groundwater recharge 57 groundwater pumping 56 nutrient runoff 55 coastal erosion 54 groundwater 54 stormwater pollution 53 Salinity 53 siltation 53 aquifer 53 sedimentation 53 soil erosion 52 estuaries 52 silting 52 freshwater 52 desertification 52 nutrient pollution 52 harmful algal blooms 51 underground aquifer 51 aquifers 51 sewage overflows 50 reservoirs 50 arsenic contamination 50 shoaling 50 sewage spills 50 water 50 seagrass beds 50 beach erosion 49 overexploitation 49 irrigated agriculture 49 estuary 49 freshwater ecosystems 49 river deltas 49 underground aquifers 48 rainwater runoff 48 eutrophication 48 dissolved oxygen levels 48 algal blooms 48 stormwater runoff 48 fragile ecosystem 48 water borne diseases 48 estuarine 48 wetland habitat 48 sewage overflow 48 algae blooms 48 toxic algae 47 seepage 47 coastal ecosystems 47 brackish water 47 tidal wetlands 47 acidification 47 outfalls 47 sewer overflows 47 silt 47 species extinctions 47 sediment 46 desal 46 El Niño phenomenon 46 backflow 46 turbidity 46 algal bloom 46 Severe drought 46 headwater 46 wetlands 46 desalinization 46 prolonged drought 46 Angat Dam 45 Edwards Aquifer 45 sewage 45 coastal 45 Erosion 45 erosion 45 ecologically fragile 45 environmental degradation 45 Sediment 45 diking 45 irrigation 45 retention basins 45 outfall 45 basin 45 coastal wetlands 45 watersheds 45 frequent droughts 45 desalinated water 45 river basin 44 aquatic species 44 Inland Bays 44 subsidence 44 oxygen depletion 44 Groundwater 44 mosquito borne illnesses 44 reservoir 44 drainage 44 wetland habitats 44 seawater desalination 44 stormwater 44 invasive aquatic 44 habitat fragmentation