sewer manhole covered with a large metal grille that catches rough larger pieces of dirt from a u-d concrete gutter. highway

architecture asphalt block brick capacity catch catches cave cement cobblestone concrete covered curve dirt drain drainage dry floor forest garden grass grate green grille groove ground gutte gutter highway large larger manhole metal new outdoor path pavement paving pieces rain retaining retention road roadside rough secret security seecret sewage sewer sewing sidewalk steel stone street surface system that urban vault walkway wall warehouse way