Examination of Estimates of Expenditure 2019-20 Reply Serial No
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Examination of Estimates of Expenditure 2019-20 Reply Serial No. DEVB(W)098 CONTROLLING OFFICER’S REPLY (Question Serial No. 1389) Head: (194) Water Supplies Department Subhead (No. & title): Not Specified Programme: (1) Water Supply: Planning and Distribution Controlling Officer: Director of Water Supplies (C L WONG) Director of Bureau: Secretary for Development Question: Regarding water consumption in the past 3 years in Hong Kong, would the Government inform this Committee of: 1. the water consumption per year in Hong Kong and the source of drinking water; 2. the ratio of using fresh water for flushing; whether it will be lowered in the coming 10 years; if yes, of the details; 3. the respective number of reports of fresh water main bursts and salt water main bursts in each district in each year; 4. the total quantity of drinking water wasted each year; and 5. the progress of the Replacement and Rehabilitation Programme for water mains? Asked by: Hon CHAN Hak-kan (LegCo internal reference no.: 36) Reply: 1. In Hong Kong, the source of fresh water is rainwater collected from local catchments and imported Dongjiang water from Guangdong Province while the source of salt water for flushing is seawater. The fresh water and salt water consumption in the past 3 years are tabulated below: Year Fresh Water (mcm#) Salt Water (mcm#) Total Water Consumption (mcm#) 2016 987 260 1 247 2017 980 278 1 258 2018 1 013 279 1 292 # million cubic metres (mcm) 2. The use of temporary mains fresh water for flushing is about 5% of the total water consumption. Over the years, the Water Supplies Department (WSD) has been extending the salt water supply network, which currently covers about 85% of the population in Hong Kong. We will be extending the salt water supply network to cover Tung Chung, and the salt water supply system for which will be completed in 2023. Besides, as the Shek Wu Hui Sewage Treatment Works will be upgraded into an Effluent Polishing Plant (EPP) by adopting tertiary treatment, we will further process the tertiary treated effluent from the EPP to produce reclaimed water for supply to the northeast New Territories, including Sheung Shui and Fanling, which is currently being supplied with temporary mains fresh water for flushing, in phases from 2022 onwards for flushing and other non-potable uses. We are also pursuing the implementation of a centralised grey water recycling system at the Development of Anderson Road Quarry Site, which will first treat the grey water collected within the development, and then distribute the treated grey water back to the development for flushing and other non-potable uses. When the aforementioned extension of salt water supply network and recycled water supply systems are fully commissioned, the coverage of salt water and recycled water supply networks for flushing will increase to approximately 90% of the population in Hong Kong. With a view to further reducing the use of fresh water for flushing, we will continue to review the extension of supply of salt water and reclaimed water to other new development areas and those areas still being supplied with temporary mains fresh water for flushing, wherever it is technically feasible and cost-effective to do so. Hence, it is anticipated that the use of fresh water for flushing will be lowered in the coming 10 years. 3. The number of water main burst cases in 2016, 2017 and 2018 by districts are tabulated below: – Fresh Water Mains Salt Water Mains District 2016 2017 2018 2016 2017 2018 Central & Western 3 3 3 0 2 5 Eastern 7 6 4 4 6 2 Islands 9 2 2 0 0 0 Southern 3 1 4 1 1 2 Wan Chai 2 6 7 1 2 7 Kowloon City 7 1 3 11 4 6 Kwun Tong 2 0 2 7 6 4 Sham Shui Po 1 2 1 3 1 2 Wong Tai Sin 0 0 0 0 2 0 Yau Tsim Mong 4 1 2 3 3 8 North 1 0 0 1 0 0 Sai Kung 2 1 1 4 2 3 Sha Tin 5 2 2 1 4 2 Tai Po 2 1 2 6 2 1 Kwai Tsing 3 5 10 7 9 12 Tuen Mun 2 0 0 0 6 2 Tsuen Wan 3 2 0 3 2 2 District Fresh Water Mains Salt Water Mains Yuen Long 8 3 5 0 0 0 Total 64 36 48 52 52 58 4. The amount of fresh water drained away due to main bursts was less than 0.01% of the total fresh water supplied. 5. Following the substantial completion of the replacement and rehabilitation programme in 2015, WSD is implementing underground asset management for the water mains to maintain the healthiness of the water supply networks. We will assess the risk of the water mains taking into account factors including their ages, materials, conditions, burst and leak records, consequences of failure, etc. and will carry out improvement works (including repovisioning of water mains) to those water mains assessed with high risk. Besides, we will carry out improvement works to water mains in “main burst hot spots” (i.e. locations with repeated water main bursts). About 40 kilometres of water mains have been reprovisioned in 2018-19. - End Examination of Estimates of Expenditure 2019-20 Reply Serial No. DEVB(W)099 CONTROLLING OFFICER’S REPLY (Question Serial No. 3264) Head: (194) Water Supplies Department Subhead (No. & title): Not Specified Programme: (1) Water Supply: Planning and Distribution Controlling Officer: Director of Water Supplies (C L WONG) Director of Bureau: Secretary for Development Question: Regarding the Water Intelligent Network (WIN), the Department has started the project since 2015 by dividing the territory into 2 000 areas with high-technology monitoring and sensing equipment installed in the network. A tremendous amount of flow and pressure data as well as other associated network data is collected by WIN to solve problems such as mains leakage. In connection to the establishment of WIN, would the Government inform this Committee: 1. What are the manpower and resources allocated for establishing WIN for this year? What is the current progress? 2. What is the expected effectiveness and what is the timetable? 3. There are still mains bursts happening from time to time in Hong Kong causing large scale traffic congestion and other problems. Would the Department consider replacing the identified aging water mains on its own initiative during the time before WIN is completed? If yes, what are the details? How many resources will be allocated by the Department for it and what is the timetable? If no, what are the reasons? Asked by: Hon CHAN Han-pan (LegCo internal reference no.: 45) Reply: The Water Supplies Department (WSD) is progressively establishing the Water Intelligent Network (WIN) by setting up District Metering Areas (DMAs) in the fresh water supply distribution networks. The WIN aims to link up the DMAs established or being established under other projects as well as establishing the remaining DMAs as necessary to cover the fresh water supply distribution networks over the territory. In addition, WSD is installing an Intelligent Network Management System (INMS) for monitoring the water loss in the DMAs. 1. The estimated total expenditure in 2019-20 for establishment of the DMAs and installation of INMS for WIN under Public Works Programme Items Nos. 9196WC, 9198WC and 9202WC is about $98 million. Six professionals of WSD, while also handling other duties, are involved in the supervision of the consultants and contractors and administration of the consultancies and contracts for these projects. As at the end of December 2018, we have established 1 263 DMAs out of the target of 2 400 DMAs for the fresh water distribution networks over the territory according to the latest planning. 2. With the progressive establishment of WIN and installation of INMS, the water loss in the DMAs established in the fresh water supply distribution networks under WIN will be continuously monitored with a view to determining the priorities and the most effective measures to tackle the water loss in individual DMAs, including active leakage detection and control; water pressure management; quality and speedy repair of water mains bursts and leaks; and reprovisioning of water mains beyond economical repair. In the meantime, we are making use of those established DMAs for identifying locations with significant water loss for follow up actions. It is expected that INMS will be commissioned in mid-2020 while the establishment of WIN will be completed in 2023. 3. In tandem with WIN, WSD is implementing underground asset management for the water mains to maintain the healthiness of the water supply networks. We will assess the risk of the water mains taking into account various factors including their ages, materials, conditions, burst and leak records, consequences of failure, etc. and will carry out improvement works (including reprovisioning of water mains) to those water mains assessed with high risk. Besides, we will carry out improvement works to the water mains in "main burst hot spots" (i.e. locations with repeated water main bursts). About 40 km of water mains will be reprovisioned in 2019-20 and the estimated expenditure for reprovisioning of water mains in 2019-20 is about $700 million. - End Examination of Estimates of Expenditure 2019-20 Reply Serial No. DEVB(W)100 CONTROLLING OFFICER’S REPLY (Question Serial No. 0053) Head: (194) Water Supplies Department Subhead (No. & title): Not Specified Programme: (3) Customer Services Controlling Officer: Director of Water Supplies (C L WONG) Director of Bureau: Secretary for Development Question: What was the number of applications for water meters in each of the past 2 years (i.e.