Related by context. Frequent words. (Click for all words.) 57 valley fills 56 navigable waters 54 streambeds 54 sediment 54 woody debris 54 watercourse 53 freshwater wetlands 53 bottomland 53 wetlands 52 ash ponds 52 drainage ditches 52 riverbeds 52 silt 52 watersheds 52 floodplain 51 streambed 51 Clean Water Act 51 dissolved solids 51 contaminated sediments 50 groundwater 50 spawning habitat 50 livestock manure 50 watercourses 50 impoundments 50 waterways 50 beaver dams 49 total dissolved solids 49 aquifers 48 wetland 48 waterbodies 48 basins 48 flood plain 48 sediments 48 ponds 48 streams 48 lakebed 48 aquatic vegetation 48 rivers 48 rivers creeks 47 gravel pits 47 tributaries 47 dredged material 47 drainages 47 underground aquifers 47 vegetation 47 river bottoms 47 Sediment 47 riparian habitat 47 groundwater recharge 47 headwaters 46 saturated soils 46 contaminate groundwater 46 sedimentation 46 arroyos 46 arroyo 46 topsoil 46 riprap 46 chlorides 46 drainage basin 46 pollutants 46 mine tailings 46 vernal pools 46 sumps 46 lakes ponds 45 roadside ditches 45 cubic yards 45 contaminated sediment 45 polluted waterways 45 shoreland 45 underground aquifer 45 aquifer 45 rip rap 45 creek 45 contaminants 45 vegetated 45 soils 45 swales 45 fly ash 45 flood plains 45 basin 45 polluted runoff 45 storm drains 45 pollutant 45 impervious surfaces 45 rivers lakes 45 coal seams 45 wastewater discharges 45 drainage pipes 45 floodplains 45 spawning beds 45 Response Compensation 45 toxic waste 44 smokestack emissions 44 contaminated soils 44 nutrient pollution 44 riparian 44 tributary 44 coal ash 44 TMDL 44 lakes 44 wildlife habitat