Back to WinCan VX DDMS User Guide
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Introduction to DDMS Surveying
DDMS is Highways England’s technical information about the location and condition of all drainage infrastructure on their network.
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Traffic Management – all work on the highways network always requires traffic management, and in most cases, this is provided by sub-contractors. The key here is to understand who is going to organise and fund this resource. It is often the contractor’s (or the sub-contractor’s) responsibility, but sometimes maybe the Area is already doing some other work on the carriageway and so they already have TM (Traffic Management) in place which the contractor can also utilise.
Hours of Work – these describe the start and end times of the permit to work on the road and caries across different areas. Area 5 (the M25 around London) has the shortest road space times because of the sheer volume of traffic on that road. An example of the hours might be 8pm to 6am, but this does not mean that the contractor will be able to start work at 8pm and go straight through to 6am. This means that the TM crews will start putting their management precautions (signs and cones etc) out from 8pm, and they may have to be all off the road by 6am, so the result to the CCTV contractor is that they are only likely to actually get on site from 9:30pm until 4:30am, because their access to the site is controlled and monitored by the TM.
Waste Disposal and Water – where jetting and suction machines are used to clean pipes (usually this is the case), there maybe requirements like; ‘The jetting machine is not allowed to leave site to fill up with water’. So, the contractor must consider how they are going to keep the machine working for the whole shift, maybe with bowsers on site. Additionally, it is common for highways drains to have significant quantities of silt inside, and large combination jetting machine can comfortably suck up 10 tonnes of silt in a shift. This silt must be disposed of safely to a registered facility and this of course costs money, and the truck operators need reasonable time in their shift to complete this task before returning home so that the truck is ready for the next shift.
Welfare – the operators on site always need welfare facilities because there are no toilets dotted along the sides of the motorway, and they should always be provided with a safe-haven for breaks etc.
Deliverables – the standard deliverables required for HADDMS are not particularly complicated although they do require a high level of validation and post-processing, but it is most often the case that the Area requires a significant amount of additional data on top of the standard deliverables, usually because they are using the data collected for design and modelling. The contractor should understand exactly what these requirements are. Not all Areas have the same needs here.
Delivery Date – when does the client expect to receive their data? HADDMS data processing is tough work and takes a long time after all works have completed on site, and the client’s needs here may dictate how many vans and/or trucks are needed on site at any one time to complete the works.
Training – it is usual for Areas to specify levels of training that is required by operators on site. These will follow national standards and codes of practice and are likely to be higher than those required for non-HADDMS inspections.
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