Landcom Book 4 Maintenance - WSUD

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Water Sensitive Urban Design 6.1.3 Stage 3: Operational establishment (civil and/or landscaping) Stage 3 involves reconnecting the functional elements of the WSUD element to meet design specifications. In general, this involves decommissioning erosion and sediment control protection devices and replanting of landscape areas. Specific tasks within stage 3 as they relate the WSUD elements addressed in the Operations and Maintenance booklet are: Bioretention basin Desilt basin if converted to a temporary sediment basin. Remove measures protecting filter media, for example bunds, filter cloth, topsoil and turf. Flush out under-drainage using potable (mains) water Flatten filter media surface to within given tolerance (additional media may be required to fill in over-excavated areas) Mulch filter media, allowing for planting holes Dig holes for planting Plant nominated species Maintain landscaping to ensure healthy plant establishment Constructed wetland Remove accumulated sediment and gross pollutants from inlet zone (and macrophyte zone if the wetland has been used as a sedimentation basin during stage 2) Assess the condition of the impervious liner and hydraulic structures (if the wetland has been operated as a temporary sediment basin in stage 2) and amend accordingly Install topsoil in basin to a depth of 300 mm on batters and 500 mm below the normal water level (this will be required for the macrophyte zone only if zone used as a sediment basin during stage 2) Remove disconnection between inlet and macrophyte zone (only if macrophyte plantings have been established during stage 2)* Landscape macrophyte zone if zone not yet established** Landscape inlet zone according to the design specifications** Sedimentation basin / pond Desilt basin Remove sterile grass from basin and establish marsh zone and embankment planting as per the design specifications Install topsoil to a depth of 300 mm on batters and 500 mm below the normal water level Landscape basin as per the planting specifications*** NOTE: * If the wetland has been used as a temporary sedimentation basin during stage 2, establish macrophyte plantings prior to bringing the macrophyte zone online. Specific requirements for plant establishment in the macrophyte zone of a constructed wetland are detailed in the Water by Design documentation. ** Water levels will need to be manipulated during landscape establishment *** Water level manipulation is not required for ponds. The plants specified for the base of ponds will be suitable for an environment starved of oxygen. Typically plant establishment in ponds is through anchoring the plants / seedlings to the pond base with rocks. This task is required regardless of what sediment control measures are instigated as part of stage 2. Specific plant establishment requirements including fertiliser application and recommended watering schedule (including frequency of watering for terrestrial and marsh plantings, and the requirements for water level manipulation in constructed wetlands and ponds) are not detailed in this booklet. The reader is directed to the Water by Design (2009) documentation for further information. 44 Book 4 | MAINTENANCE
Water Sensitive Urban Design Stage 3 – Operational Establishment Operational Establishment Book 4 | MAINTENANCE 45
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Landcom Book 4 Maintenance - WSUD

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