lock chambers

arch arches bars boat boats bolt bulk canal canals chamber chambers clinch complex construction contour cross crossing door doors drain drains dutch fixed frame girder holland hydraulic level lift line lines lock locks lowering marine material metal metallurgy monument nail nautical navigation navigations netherlands old passage passages perspective point pointed porch portal portals pump pumps river rivers rivet scenic scupper ship shipping ships sluice solid structure stud texture textured track traditional traffic transportation water watertight waterway way