"maxdraught"=>"1.6","seamark:name"=>"Keersluis Blokzijl","seamark:type"=>"gate","seamark:source"=>"https://www.vaarweginformatie.nl/frp/main/#/geo/detail/EXCEPT_NAV_STRUCTURE/4910","seamark:gate:category"=>"flood_barrage","river:waterway_distance"=>"12.318","seamark:gate:clearance_width"=>"7","seamark:gate:clearance_height"=>"999"