A flooded hotel lobby and promenades engulfed by seas whipped up as Super Typhoon Ragasa bore down on Hong Kong provide timely lessons for buildings and urban planning in coastal and low-lying areas, experts have said. They called for flood-resilient features and higher breakwaters on Wednesday after a storm surge and downpours associated with Ragasa battered the city’s coastline, inundating streets and promenades, with floodwaters rushing into restaurants, parks and even a lobby in the 425-room...