Related by context. Frequent words. (Click for all words.) 48 elevator shafts 44 storm drains 44 Tree limbs 44 retaining walls 44 bridge abutments 42 drainage pipes 42 sewer mains 41 underground piping 41 sewer pipes 41 storm sewers 40 Raw sewage 40 ponding 39 overhead wires 39 catch basins 39 stormwater runoff 39 g h 39 rainwater runoff 39 manhole covers 39 turbidity 39 sanitary sewers 39 paved surfaces 38 manholes 38 footbridges 38 sewage 38 streetlamps 38 sewage overflow 38 water mains 38 concrete piers 38 sumps 38 sewage pipes 38 outfall 38 raw sewage 38 tree limbs 38 outfalls 37 Downed trees 37 stormwater drains 37 downed tree limbs 37 transformers 37 flooded basements 37 utility poles 37 backflow 37 stairways 37 retention basins 37 swales 37 sidewalks 37 impervious surfaces 37 seepage 37 clarifiers 37 polluted groundwater 37 sewage discharges 37 streambeds 37 gutters 36 roofing shingles 36 drainage 36 stormwater drainage 36 masonry walls 36 walkways 36 waterlines 36 river bottoms 36 spewed ash 36 sanitary sewer 36 sewer overflow 36 powerlines 36 pollutants 36 culverts 36 untreated wastewater 36 gratings 36 soffits 36 sewers 36 stairwells 36 roadbed 36 electrical wires 36 drainage culvert 35 stormwater drain 35 detention basins 35 retaining wall 35 driveways 35 roofs 35 retention pond 35 debris littering 35 water 35 curbs gutters 35 storage tanks 35 drains 35 refreezes 35 combined sewer overflows 35 septic tanks 34 riverbanks 34 chimneys 34 polluted runoff 34 onramps 34 fallen tree limbs 34 sediment runoff 34 windrows 34 sump pumps 34 sinkholes 34 pipes 34 gangways 34 contaminants 34 sewage overflows 34 drainage ditches