Secretary for Development Bernadette Linn says an additional one-metre-high barrier will be installed at the Tseung Kwan O South Waterfront Promenade in order to bolster flood defences during future typhoons.

Tseung Kwan O experienced severe flooding caused by Super Typhoon Ragasa, with more than 20 waterfront restaurants in the area damaged this week.

Linn said that while existing defences are in place, including a five-metre-high wave barrier and sloped stone walls designed to absorb wave energy, the recent typhoon showed that there is a need for more protective measures.

She said work on the new barrier project has just begun and is slated for completion next year, noting that it is one of more than 30 places identified by authorities in recent years as needing improvements in precautionary measures against flooding risks.

"We will check if there are any places we overlooked, whether existing or planned facilities, such as flood barriers or removable flood panels, are high enough or if they need to be raised," she said.

"We will continue this work, and after each event, we will review whether there is any new information."

Additionally, she said, the government will discuss with promenade restaurant owners the possibility of installing temporary inflatable flood barriers outside their entrances as a further precautionary measure.