flood wall fence crossing town along the river

army backdrop background bag barricade barrier blank blast boundary bricks brown buildings bunker calamity catastrophe catastrophic city concept construction dam damage danger defense deluge desert disaster door doorway emergencies empty environment environmental fence flood floor global gloomy hazard heavy house insurance iron lines metal metallic military nature object old outdoors pattern pile property protect protection rain river sack safety sand sandbag security shelter stack stone storm street texture urban wall war warming water weather wet zone