Related by context. Frequent words. (Click for all words.) 63 Soil erosion 60 stormwater discharges 59 sedimentation 59 groundwater depletion 59 shoreline erosion 57 soil erosion 56 nutrient loading 56 sediment runoff 56 recharge groundwater 56 Sedimentation 56 groundwater extraction 56 stormwater ponds 56 salination 55 stormwater discharge 55 groundwater recharge 55 nonpoint source pollution 55 nitrate contamination 55 riparian zones 54 hydrogeologic 54 soil salinity 54 sanitary sewer overflows 53 pollution abatement 53 riparian vegetation 53 groundwater withdrawals 53 polluted runoff 52 groundwater 52 tailing ponds 52 sewage discharges 52 stormwater retention 52 Stormwater runoff 52 aquifer recharge 52 geologic hazards 52 effluent disposal 52 stormwater pollution 52 hydrogeological 51 stormwater runoff 51 stormwater 51 nutrient runoff 51 riparian buffer 51 wastewater effluent 51 polluting groundwater 51 groundwater aquifers 50 effluent discharge 50 wastewater 50 pollution 50 groundwater pumping 50 streambanks 50 drainage 50 aquatic habitat 50 polluting waterways 50 siltation 50 water 50 drainfield 49 nonpoint sources 49 sewage disposal 49 manure spills 49 hydro geological 49 wastewater discharges 49 biofouling 49 pollutant discharge 49 Septic tanks 49 environmental 48 contaminating groundwater 48 nonstructural 48 shallow aquifer 48 hydrological 48 aquatic ecosystem 48 detention basins 48 nitrogen deposition 48 sewage effluent 48 polluted groundwater 48 saltwater intrusion 48 wildlife habitat 48 bioswales 48 hydrology 48 nutrient absorption 48 sewage lagoon 48 wellfields 48 biosolid 47 tailings impoundment 47 irrigated lands 47 watersheds 47 wetland 47 riparian buffers 47 hydrologic cycle 47 nesting habitats 47 wetland restoration 47 transboundary 47 retention basins 47 ecological 47 NPDES 47 pollute waterways 47 environmental degradation 47 Nipomo Mesa 47 habitat fragmentation 47 Transboundary 47 graywater 46 livestock manure 46 geotechnical engineers 46 soil compaction 46 environ mental