Melbourne Water engaged Engeny to assess the hydraulic regime and recommend rectification works of five wetlands across Melbourne. Melbourne Water identified that these wetlands are not functioning as per their design intent.
The outcomes for this project included:
These wetlands have minimal aquatic vegetation present, which is assumed to be the result of extended periods of inundation or raised normal top water levels (NTWL). The wetlands should have a draw down period to NTWL of up to 72 hours, and times of no inundation to ensure the survival of the vegetation within the wetland. The key factor that distinguishes a wetland from other water bodies is the presence of vegetation. Constructed wetland systems rely on vegetation, both emergent and submerged, to provide nutrient uptake from the stormwater. Without the extensive vegetation coverage, the wetland is not functioning in accordance with the intent of the asset.
Engeny visited all five wetlands with Melbourne Water wetland planning and operations staff, documented all of the issues with the wetland and designed rectification works to resolve various issues.
Wetland design details have changed over the decades, so the design details, including outlets were compared with current Best Practice and optimal hydrologic regimes.
Engeny made recommendations for cost effective works to adjust the wetlands, particularly outlet structures to improve their performance.
This project demonstrates how Engeny can work closely with Melbourne Water on complex wetland projects.
Engeny applied the latest Best Practice to the operation of 5 Melbourne Water wetlands
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