Landcom Book 4 Maintenance - WSUD

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Water Sensitive Urban Design Ponding time Detention of flows above the design intent could indicate a blockage in the outlet structures. Typical drainage times for treatment systems are: •• 72 hours for a constructed wetland •• 6 to 24 hours for a bioretention basin •• 24 hours for a sedimentation basin Surface distribution of flows Flow should pond evenly within the treatment system Additionally, the absence of ponding after a significant storm event may indicate a blocked inlet (that is, flows are being prevented from entering the treatment system) Scouring Scouring can be indicative of a blocked inlet 5.2.2 Regular Inspection and Maintenance Generally, WSUD elements should be inspected every three months, with particular reference to: •• Structures, such as overflow weirs, bypass and inlets •• Erosion •• Sediment build-up •• Weeds •• Algal blooms •• Litter (anthropogenic and nonanthropogenic) •• Oil slicks The following tables in the next three sections further explore the above issues as related to constructed wetlands, bioretention systems or sedimentation basins / ponds. In particular, the tables: •• articulate monitoring requirements •• suggest graded targets for optimal performance •• suggest scheduling of maintenance and immediate action •• propose a general approach to maintenance activities 5.2.3 Bioretention Systems The routine maintenance of a bioretention basin is required to ensure diverted storm water: •• Ponds evenly across the basin surface •• Percolates through the filter media such that the ponding time does not exceed the design specifications (typically 6 to 24 hours) To ensure the functionality of the bioretention basin is retained, maintenance activities will typically involve: •• Routine inspection of the bioretention profile to identify any areas of obvious increased sediment deposition, scouring of the basin or swale invert from storm flows, rill erosion of the batters from lateral inflows, damage to the swale profile from vehicles and clogging of the bioretention trench (evident by a ‘boggy’ swale invert) •• Routine inspection of inlet points, surcharge pits and field inlet pits to identify any areas of scour, litter build up and blockages 22 Book 4 | MAINTENANCE
Water Sensitive Urban Design Boardwalk | Victoria Park •• Removal of sediment, especially where it is impeding the conveyance of the bioretention swale and/or smothering the vegetation, and if necessary, reprofiling of the system and re-vegetating to original design specification •• Repairing any damage to the system profile, especially in the case of a bioretention swale, resulting from scour, rill erosion or vehicle damage •• Tilling of the bioretention trench surface if there is evidence of clogging •• Clearing of blockages to inlet or outlets. •• Regular watering/irrigation of vegetation until plants are established and actively growing •• Mowing of turf or slashing of vegetation (if required) to preserve the optimal design height for the vegetation •• Removal and management of invasive weeds •• Removal of plants that have died and replacement with plants of equivalent size and species as detailed in the plant schedule •• Pruning to remove dead or diseased vegetation material and to stimulate new growth •• Litter and debris removal •• Vegetation pest monitoring and control Resetting (i.e. complete reconstruction) of bioretention elements will be required if the available flow area of the overlying basin is reduced by 25 percent (due to accumulation of sediment) or if the bioretention trench fails to drain adequately after tilling of the surface. Book 4 | MAINTENANCE 23
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Level 2, 330 Church Street Parramat
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Landcom Book 4 Maintenance - WSUD

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