Landcom Book 4 Maintenance - WSUD

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Water Sensitive Urban Design Table 5 | Routine monitoring requirement for sedimentation basins. Item to be Monitored Purpose of Monitoring Performance Target Schedule Maintenance or Investigation Immediate Action Required Maintenance Action Required Structures The inlet and outlet structures of a sedimentation basin should be free of debris, litter and sediment to ensure flow is not impeded. Large storms (or flood) events and vehicles can also damage or block these structures and prevent the system working as designed. The main structural elements of a sedimentation basin are: - GPT / trash rack/s GPT clear of litter GPT 10 percent full greater than 30 percent full Contact cleaning service. Generally a GPT will require clean-out four times per year. For proprietary GPTs it is recommended that a vacuum cleaner be used on at least one occasion per year, or when frequent overflow of litter from the GPT is evident. For all other clean-outs, a mechanical grab is sufficient. - Inlet structures Clear and undamaged Partially Blocked Observed damage Mostly blocked Severe damage Schedule removal of debris or contact relevant authority within Council for structural damage. - Overflow pits Inspect the sedimentation basin for scour or erosion damage and fix accordingly. Erosion Erosion will affect the distribution of flow across the sedimentation basin. If left untreated, small sites of erosion can quickly spread over large areas becoming costly to repair. Erosion absent Erosion damage visible, but function not impaired Severe erosion. Damage impairing function of device Schedule investigation to identify cause of profile damage. Once source of damage is rectified, scour holes should be replaced with appropriate filter media. Replace any damaged plants to meet the design plant schedule. Sediment build up The accumulation of sediment is a prescribed function of a sedimentation basin. However, sediment must be regularly removed to ensure that the sediment trapping performance of this system is sustained. Sediment absent Sediment accumulation appears excessive Sediment accumulated to half the sediment basin depth Schedule investigation to identify sediment source. Once sediment source is stabilised, remove accumulated sediment. Replace any damaged plants to meet the design plant schedule. 32 Book 4 | MAINTENANCE
Water Sensitive Urban Design Item to be Monitored Purpose of Monitoring Performance Target Schedule Maintenance or Investigation Immediate Action Required Maintenance Action Required Weeds and invasive plants Weeds should be removed from the sedimentation basin: - Weeds can spread to downstream environments, compromising ecosystem health. - Weeds compromise the visual amenity of the sedimentation basin. No weeds present Weeds present Noxious or environmental weeds present, or weed cover more than 25 percent Hand removal or targeted herbicide treatment (herbicides registered for use around waterways). Note: Herbicides should not be routinely used to maintain edges and batter slopes. General spraying of batter slopes should not be undertaken without follow up revegetation with native species. Plant Condition Plants are crucial to bank stability and visual amenity Healthy vegetation Poorly growing or visibly stressed Die back / dead plants Schedule an investigation into the cause of plant die-back or poor health. Maintenance action will depend on the cause of die-back or poor plant health. Once the problem is rectified, infill planting may be required, especially if more than 1 square meter of plantings has died. Infill planting must be as per the original planting schedule. Litter (organic) Organic litter can provide an additional source of nutrients and on-native species which have a high likelihood of being transferred to downstream treatment systems and waterways. No litter visible Litter visible Litter thickly covers filter media surface or detracting from visual amenity Identify source of organic litter and address with appropriate response action: e.g. change of landscape maintenance practices; community education re: litter dumping (appropriate for repeat incidences). Accumulated organic matter / litter can also cause offensive odours (such as methane gas and hydrogen sulphide, i.e. rotten egg gas). In the interim, all litter must be removed by maintenance crews. Litter (anthropogenic) Litter can potentially block the inlet and outlet structures resulting in flooding, as well as detract from the system’s visual amenity. No litter visible Litter visible Litter blocking structures or detracting from visual amenity Identify source of rubbish: e.g. from catchment (commercial precinct); overflow of rubbish bins; accumulation in backwater area and schedule general maintenance to remove rubbish. Where required address source of rubbish (e.g. increase in frequency of rubbish bin emptying; gross pollutant traps in high load generation land uses). In the interim, all litter must be removed by maintenance crews. WARNING: Contact with sharp objects, including hypodermic needles is a risk when removing litter. All workers must be made aware of this risk, wear appropriate protective gear and use caution. Book 4 | MAINTENANCE 33
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Level 2, 330 Church Street Parramat
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Landcom Book 4 Maintenance - WSUD

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