Management of rubber dams in Hong Kong

Abstract

The rubber dam is a relatively recent technological breakthrough. It was introduced to Hong Kong in the early 1960s. To date, a total of 20 rubber dams have been installed in Hong Kong. Most of the dams are used to impound water for irrigation. Due to its inflatable and deflatable characteristics, the rubber dam is excellent for flood mitigation and environmental protection. When a dam is inflated, it blocks water. When the river level reaches a preset value, the dam deflates automatically and the flood risk is reduced. Furthermore, silt deposits, debris, garbage, and animal wastes behind the dam can be removed by regular deflation. Much of the maintenance work required for rubber dams is related to punctures, which are simple to repair. The vulnerability of a rubber dam to damage by sharp objects or vandalism is the major disadvantage. Ceramic chips coating and stainless steel mesh have been used to strengthen the dam body against damage by sharp objects. Continual technological innovation is vital to the improvement of rubber dam performance. This paper highlights the various issues connected with rubber dam applications in Hong Kong, including procurement, construction, operation, maintenance, problems, and countermeasures.Key words: rubber dam, management, technological innovation, application, construction, operation, maintenance.