The Municipal Affairs Bureau (IAM) continues to inspect the operation of drainage systems in various districts, and strengthens monitoring and drainage clear-up of the areas where flooding occurs frequently. From January to March this year, a total of 50 tons of silt and waste was cleared in the island districts. Among them, the public drainage network around the large hotel construction sites in the Cotai area was found to have accumulated a huge amount of construction waste, severely affecting the efficiency of the drainage systems. In addition to dispatching additional personnel to unclog the drainage systems, IAM also focused on inspections of the large hotel sites in the Cotai area. As of the first quarter of this year, 147 drainage inspections were carried out on construction sites, including more than 20 inspections done in the large hotel sites in the Cotai area, with 3 written records issued on the illegal discharges found.
Since there was flooding in some places in the Cotai area last year, IAM has continued to use the sewage CCTV endoscopy technology to monitor the operation of the drainage systems, and analysed the data of the drainage network of flooded areas. During the inspections, it was found that a huge amount of construction waste was deposited in the public drainage. Among them, the public drainage network around the large hotel construction sites are more seriously blocked, which affects the efficiency of the drainage systems. IAM has immediately dispatched additional personnel to urgently unclog the drainage systems. Key locations for clear-up include Avenida dos Jogos da Ásia Oriental, Avenida Marginal Flor de Lótus, Avenida Cidade Nova, etc. and the surrounding drainage network, removing large cement boards and other construction waste from the public drainage network.
At the same time, IAM has stepped up inspections and enforcement of penalty, and scrutiny of illegal sewage discharge on the construction sites. It has also launched joint inspections with the Land and Urban Construction Bureau and the Environmental Protection Bureau on a number of large-scale tourism project sites. According to the samples of the discharged water collected on the sites, some of the water samples were found to have components exceeding the legal limit. Corresponding penalty has been imposed for the violations in accordance with the law, and the contractors have been required to unclog the affected drainage systems and provide a proof of drainage clear-up.
Keeping the drainage unblocked is the key to preventing flooding. The responsible parties of the construction sites must fully assess the impacts of the project drainage on the existing public drainage network, formulate countermeasures, and obtain the excavation license issued by IAM before the construction project starts. Only after that can the construction wastewater meeting the requirements of the “Regulations on Water Supply and Drainage in Macao” be discharged to the designated sewers. At the same time, necessary measures shall be taken during the rainy and typhoon season to prevent the accumulated water in the catchment areas of the sites from being discharged to public drainage systems without effective treatment or from flowing to the public drainage systems or public areas. If members of the public would like to know more about the operation of the wastewater filtration equipment on construction sites and related information, please refer to “Construction wastewater filter equipment system in construction sites” at www.iam.gov.mo/e/resource/.