Q: What is the distance between drain access openings?
A: The distance between access openings for the closed drains ranges from 6m to 50m. There may be outlier locations where the distance between openings have changed due to nearby developmental works. These are however few and localised.
Q: Does PUB have information regarding the location of drains with obstructions, e.g., service crossings?
A: PUB does not have all the information regarding the location of drains with obstructions. Therefore, we are looking for agile solutions that can overcome obstructions during the inspection process.
Q: What is the maximum liquid flow rate in the drains?
A: Inspections are to be carried out during dry weather conditions. Drains are designed with flow velocity between 1-3m/s during dry weather.
Q: Are there any sudden drops in depth along the drainage line?
A: The drains are built to have a gradual gradient, but there may be localised sections with sudden drops in depth (e.g., cascading profile) due to the ground profile.
Q: When is the inspection expected to be conducted?
A: The inspections are expected to be conducted during daytime and on days without heavy rainfall. However, it is important to note that there could be a sudden downpour of rain, and there needs to be a plan to retrieve the equipment quickly from the drains during such events.
Q: Is it a requirement that the inspection conducted by the robot covers all the internal surfaces of the drain?
A: Yes, the required inspection areas entail all the drains' internal surfaces, including the base slab, walls & covering slab (also known as the top slab).
Q: What are the required inspection intervals to assess the drain measurements and alignment, e.g., assessment every 0.1m?
A: We do not have specific requirements for the inspection intervals as long as (1) any visible defects present along the continuous length of the drain are detected and (2) the alignment and measurement of the drains are accurate to +/- 0.1m.
Q: What are robotics systems that have been trialled? What are the improvements needed?
A: We have trialled indoor drones, and they can only inspect drains of more than 2m in width. The needed improvements include the ability to inspect drains of less than 2m in width, the ability to navigate or manoeuvre partially submerged drains and the ability to overcome obstructions such as service crossings. More details and examples can be found in the presentation.
Q: Is PUB open to other types of inspection or sensing technologies besides visual-based inspection technology?
A: Yes, we are open to better alternatives that can meet our requirements while remaining cost-effective.
Q: Would PUB consider a solution comprising several robots of different types to perform the inspection?
A: We are open to trying different robots as we understand that different robots could better suit different operating conditions. We are looking for robots that can perform inspection for the different drain types to cover the entire drainage network.
Q: Does the solution need to be compatible with any existing database or software platform?
A: We are currently using ArcGIS to store our drainage data. Ideally, the new robotics platform is compatible with ArcGIS.
Q: Is there any specific format requirement related to the geospatial database?
A: We are keeping it open for our applicants to suggest the data that are more useful to display on the interface as long as the information is in ArcGIS compatible format.
Q: Do solution providers need to use any specific cloud platform?
A: For information, PUB uses a cloud platform that abides by the requirements of the Government Technology Agency (GovTech).
Visit this page for more information regarding the Government on Commercial Cloud Framework. However, for this pilot project, solution providers need not implement solution via GCC.