Stage 1 of the project involves the development of detention storages in the upper catchment. These storages hold water and control the flow, reducing flow rates to downstream areas.
Stage 1 works are complete.
1. Ridge Park Flood Control Dam
A flood control dam was constructed on Glen Osmond Creek in Ridge Park Reserve, Myrtle Bank to reduce peak stormwater flow in Glen Osmond Creek and reduce the risk of flooding in downstream areas along Glen Osmond and Keswick Creeks.
Commissioned in July 2015, the Ridge Park flood control dam also collects stormwater for the City of Unley’s managed aquifer recovery (MAR) scheme. Under the MAP, harvested stormwater is stored in an underground aquifer for irrigation of Unley’s parks during periods of dry weather.
2. Glenside Detention Basin
This project involved enlargement of an existing detention basin from a capacity of 18ML to 37 ML, to limit flow to the existing capacity of the culvert under the intersection of Fullarton Road and Greenhill Road. The detention basin, together with other works in the South Park Lands, is intended to reduce the peak stormwater flows along Park Lands Creek and to further areas downstream. Excavation of approximately 25,000m3 of material was required to form the detention basin and water quality treatment is provided via 3 large gross pollutant traps.
The site accommodating the detention basin and associated stormwater infrastructure has been developed as a community reserve with playground and associated facilities.
The Glenside detention basin was delivered by Cedar Woods as part of their residential development and the site was opened to the public on July 2nd 2021.
3. Pakapakanthi Wetland
The Pakapakanthi Wetland is located in the South Park Lands, at the southern end of Victoria Park (Park 16), adjacent Park Lands Creek. Flows from approximately 600 hectares of urban land and 100 hectares of hills face land travel down Park Lands Creek, through the Glenside site and beneath the intersection of Fullarton Road and Greenhill Road into the Park Lands. The wetland is approximately 3.2 hectares in area and provides 100 million litres of flood storage. It provides areas of permanent water, areas that become inundated with stormwater during regular flow events, and a broader area that will only become inundated during more significant flow events. The system provides regional benefits of flood detention, stormwater pollutant removal, amenity and recreational enhancement, and biodiversity creation with over 120 new trees and over 100,000 new plantings, including aquatic species.
In alignment with the Stormwater Management Plan objective of beneficial reuse of stormwater, flows are now being diverted from the wetland to the ornamental lake in Murlawirrapurka/ Rymill Park (Park 14). The lake has been experiencing ongoing issues with leakage and poor water quality, requiring chemical treatment to manage algal blooms. Surplus water levels are being drawn from the wetland to holding tanks adjacent the lake for use when required.
The Pakapakanthi Wetland was completed and opened to the public in May 2022.
Wetland Opening – Media Release
May 2022 – Wetland Official Opening
May 2022 – Wetland Now Open
October 2021 – Wetland Key Features
June 2021 – Wetland Overview
4. Kurangga Creek Works
The Kurangga Creek Works are located in the South Park Lands, in Blue Gum Park (Park 20), adjacent Park Lands Creek. These works, located at the north western corner of the intersection of Greenhill Road and Unley Road, reduce the peak stormwater flows from Park Lands Creek into downstream areas.
Works included the construction of a low-level mound and the realignment of existing creek lines in the southern section of the park. The mound is constructed to the south and west of the existing playing fields and stretches for a total distance of approximately 600 metres. Two new open drainage channels converge at a common point at the northern side of the new mound which enables controlled flows to be discharged through a culvert and under Greenhill Road. When large flows exceed the capacity of the culvert, water will be contained behind the mound and temporarily inundate parts of the park until it subsides.
The new works enabled the existing creeks to be backfilled to support tree health and protect Red Gum trees against erosion. The works integrate with existing users of this space, including TreeClimb.
The Kurangga Creek Works were completed in September 2022.
Concept Plan
Information Brochure
Frequently Asked Questions
