INSTALLATION GUIDE
MAINTENANCE MAINTENANCE PROCEDURES FOR SUSTAINABLE DRAINAGE SYSTEM
in or around the permeable paving areas. If modifications to the site are proposed then the presence of the SUDS should be highlighted to the designers and contractors so that due regard can be given to the system and damage avoided. MAINTENANCE PLAN
When installed in concrete Ensure that the ductile iron top of the unit is clear from debris and cleaned of excess concrete or mortar prior to handover. Routine maintenance procedures Maintenance on H 2 0 Linear Drainage channels should be carried out in a threefold method: Removal of debris or blockages from the intake slot Clear outlets via the connected box Rod channels via inspection locations If using a high pressure jet, the maximum pressure that can safely be applied to H 2 0 Linear Drainage channels is 180Bar or 2500psi. GOOD PRACTICE The following are general principles of good site practice which will contribute to a successful installation and handover.
Overview of system The drainage system on the site is known as a sustainable drainage system (SUDS) and is designed to manage and treat rainfall that runs off the roofs, access roads and car parking surfaces. The run-off may contain pollution arising from sources such as dust, car exhausts and oil leaks. The drainage system consists of areas of permeable surfacing, constructed from proprietary interlocking concrete paving blocks (Charcon Infilta). The permeable block surfacing is separated from an underlying highly voided sub-base (stone) layer by a heavy duty geotextile filter fabric. If applicable roof rainwater down pipes can be drained to the sub base via proprietary diffuser units, roof drainage pipes should pass through small gully pots before connection to the diffuser units and to stop debris passing into the system. How does the system work The permeable surfaces to the hard standing areas allow rainfall to directly pass through it. The heavy-duty geotextile filter fabric prevents any silt (small sized soil particles) from passing through into the underlying layers. The permeable surfacing materials, together with the geotextile also trap deposits of oil or similar contaminants that may drip from vehicles. The contaminated droplets are treated within the pavement layer by natural biological processes, which reduce the contamination to acceptable levels before it can enter the rest of the underlying drainage layers. After passing through the pavement surface, the treated water enters a layer of aggregate which is designed to slowly convey the surface water and to store the water during and after storms. Avoiding damage to the system The main cause of damage to the system is likely to be due to litter, excessive silt accumulation or physical damage to the filter system. Litter should be regularly removed from the site and the access chambers should be routinely inspected for blockages (see below). To avoid excessive silt build up the car park surfaces should be swept at least every six months.
Routine maintenance The following routine inspections and maintenance are required:
Monthly inspection of car park surfaces Remove litter/leaves or other large debris as required Every 6 months inspect all chambers and rwp gulllies for silt build up Every 6 months vacuum sweep pervious surfaces with mechanical sweeper and replace grit within joints, if required Remove silt if discovered Records of inspections and maintenance undertaken should be kept by the client. H 2 O LINEAR DRAINAGE HANDLING EQUIPMENT Deliveries of H 2 0 Linear Drainage channels may be made on pallets and as such mechanical offloading may be required. MAINTENANCE General With correct design and installation, H 2 0 Linear Drainage channels are self cleaning at a flow velocity of over 0.6I/s. However best practice dictates that in order for the system to remain efficient a regular maintenance and inspection schedule should be observed. This should include removal of silt and debris from the intake slots as well as regular rodding and cleaning of outlets via inspection points within the system. Maximum every 50m or At a change in direction or At an outlet
Handling Handle all products with care on site
to avoid damage to edges and faces. Where H 2 0 Linear Drainage channels are bundles together it is important to remove one unit at a time when ready to install the system. H 2 0 Linear Drainage channels can be heavy, as such it is important to observe all relevant site health and safety guidelines and regulations and use mechanical lifting methods where necessary. On-site storage When storing H 2 0 Linear Drainage channels on-site for a prolonged period of time, they should be kept in their original packaging and stored in a location away from trafficked areas in order to prevent damage on-site. Sitework Once installed has started, if it is necessary for site equipment to traverse the trench a protective bridge should be formed to protect the system from unnecessary damage. It is important that the system is never trafficked prior to the final stage of it’s installation, as the strength of the drainage channel is dependent on the concrete surround and any unnecessary loading will cause deformation and may affect the quality or length of the channel’s lifespan.
Commissioning and handover On completion of installation:
Flush all debris from the channel Check and empty inspection units Clean along the slot and ensure intake is clear
Grit or topsoil should not be stockpiled
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TECHNICAL INFORMATION: charcon.technical@aggregate.com
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