Related by context. Frequent words. (Click for all words.) 60 berm 58 earthen berm 57 concrete barriers 57 berms 56 retaining walls 53 dikes 51 barbed wire fences 51 earthen levees 50 riprap 50 retaining wall 50 drainage ditches 50 earthen levee 50 sandbags 50 embankments 50 rip rap 49 dug trenches 49 dike 48 levee 48 earthen 48 fences 48 concertina wire 47 levees 47 hay bales 47 fence 47 barbed wire 46 floodwall 46 fencing 46 fortifications 46 irrigation canals 46 pea gravel 46 guardrails 46 culverts 46 retention ponds 46 wire mesh 46 sand berms 45 Armored vehicles 45 outer perimeter 45 razor wire 45 concrete slabs 45 riverbed 45 cofferdam 45 drainage pipes 45 buffer zones 44 buffer zone 44 breakwaters 44 perimeter fencing 44 barricades 44 wrought iron fence 44 bulkheads 44 boulders 44 windbreak 44 irrigation ditches 44 barbed wire fence 44 roadbed 43 swales 43 floodwalls 43 earthen dam 43 watchtowers 43 perimeter fence 43 pilings 43 seawall 43 firebreaks 43 footings 43 buffers 43 canyon walls 43 canopies 43 ditches 43 bluffs 42 windbreaks 42 weirs 42 riverbanks 42 concrete 42 walls 42 arroyo 42 storage tanks 42 ponds 42 sewer pipes 42 wadis 42 stanchions 42 creeks 42 walkways 42 spillway 42 streambed 42 dig trenches 41 piers 41 dam 41 bunkers 41 footbridges 41 steep cliffs 41 retention pond 41 drainage 41 reservoir 41 trellises 41 gravel 41 perimeters 41 fenced 41 barricade 41 reinforced concrete 41 beaver dams 41 beaver dam 41 breakwater