Related by context. Frequent words. (Click for all words.) 52 embankments 52 retaining walls 48 dikes 47 limestone 47 terra cotta 46 levee 46 earthen levee 46 dike 46 earthenware 45 excavated 45 terracotta 44 reinforced concrete 44 cistern 44 octagonal 44 levees 44 sandstone 44 wooden 43 weirs 43 streambed 43 silt 43 rip rap 43 stonework 42 travertine 42 archways 42 riverbed 42 mounded 42 clay pots 42 riprap 42 basalt 42 seepage 42 earthen dam 42 masonry 42 wire mesh 42 riverbanks 41 floodwall 41 retaining wall 41 drainage 41 berm 41 culverts 41 drainage pipes 41 conical 41 wooden beams 41 sloping 41 archway 41 irrigation canals 41 creek 41 dome shaped 41 karst 41 dam 41 lagoons 41 spillway 40 fortifications 40 fort 40 sandy 40 earthworks 40 mossy 40 berms 40 arroyo 40 roadbed 40 thatched roof 40 river 40 ocher 40 sloped 40 ponds 39 cisterns 39 straw bales 39 embankment 39 bas relief 39 granaries 39 arched 39 flood plain 39 slurry 39 reeds 39 flume 39 rustic 39 timbered 39 gullies 39 ceramic 39 lagoon 39 concrete slabs 39 oval shaped 39 granite 39 trench 39 excavation 39 ancient 39 domed 39 Levees 39 irrigation canal 39 drainage ditches 39 tiled 39 constructed 38 pilings 38 wooden planks 38 brick 38 stone 38 domes 38 arches 38 canyon walls 38 pagoda 38 floodwalls 38 corrugated steel