Latest updates

Keep up to date with the latest news releases on the history and progress of the recommendations of the Katherine and Darwin Regions Flood Mitigation Advisory Committees.

Rapid Creek Flood Mitigation

A tender has been released to construct a stormwater detention basin and associated drainage to alleviate flooding in the Rapid Creek catchment.

The Department of Infrastructure, Planning and Logistics will be constructing the stormwater detention basin on the corner of McMillans Road and Henry Wrigley Drive in Marrara.

Flooding can occur in the Rapid Creek catchment when heavy rain combined with high tides causes flood water to back up into the creek and flood low-lying properties.

The detention basin is designed to temporarily detain stormwater flows from Anula, Moil and parts of Marrara outside of the flood extent during flood events.

Construction of the detention basin, combined with other flood mitigation measures to be implemented at the Darwin International Airport, will significantly reduce the impact of flooding on downstream properties.

The measures were recommended by the Darwin Flood Mitigation Advisory Committee to reduce the risk and impact of flood events in areas of Darwin.

The construction tender has been re-released after low levels of (PFAS) within soils at the detention basin site were identified. The department has undertaken further testing in accordance with the National Environment Protection Measure (NEPM) guidelines, which has shown soils within this site are significantly below the Health Based Guidance Values for PFAS.

An earthworks management plan has been finalised which outlines control measures for the disposal of excess clean fill. The plan has been developed in accordance with recommendations of an environmental assessor and endorsed by an independent auditor, in line withthe NT Environment Protection Authority requirements.

The design of the basin seeks to retain as much native vegetation as possible, with land to be cleared for the perimeter embankment only, while the excavation for the basin floor is in the previously cleared part of the site. When complete, the basin floor and embankment will be grassed to stabilise it against erosion and it will remain free draining, holding water generally no longer than 24 hours after a large rainfall event.

The contract is expected to be awarded and construction to begin in June-July 2018. The project is expected to be completed in late 2018.

Residents and the general public will be kept updated on any impacts of the construction works and required traffic management on Henry Wrigley Drive and Abala Road as part of the project.

Any queries about the flood mitigation measures and construction of the detention basin can contact the flood mitigation hotline during business hours on 1800 560 308 or email flood.migitation@nt.gov.au.

Marrara Detention Basin PFAS Update

The Marrara Detention Basin is part of the Rapid Creek Flood Mitigation program of works, to be constructed on the corner of McMillans Road and Henry Wrigley Drive. As a requirement of the NTEPA, due to the proximity of the site to the Rapid Creek corridor and the Marrara Fire Station, testing for the presence of Perfluoroalkyl and Polyfluoroalkyl substances (PFAS) has been undertaken on this site. The results of the testing has determined the soils within the Marrara Detention Basin site contains trace levels of PFAS which are significantly below the Health Based Guidance Values for PFAS. To view the interim results, refer to the below documents.

Katherine River Corridor Weed Management Plan

In 2015, the Katherine Region Flood Mitigation Advisory Committee recommended the Northern Territory Government and Katherine Town Council assess the Katherine River’s drainage system to improve river flow, including weed control.  A  Katherine River Corridor Weed Management Plan has been developed in consultation with the Katherine Town Council and the Department of Environment and Natural Resources Weed Management Branch.  For further information, read the fact sheet (8.2 mb).

Katherine Town Centre Retail and Commercial Analysis Report

In 2015, the Katherine Region Flood mitigation advisory committee commissioned an economic assessment by MacroPlan Dimasi to inform the consideration of a commercial center outside of the flood zone. Read the Katherine Retail and Commercial Analysis Report (764.2 kb).

Katherine, Darwin and Alice Springs Flood Mitigation Reports

The Katherine and Darwin Regional Draft Flood Mitigation Reports were released for public comment over a four week period which closed on 11 June 2015.

The Alice Springs Draft Flood Mitigation Report was released for public comment over a four week period during June and July 2016.

Thank you to all residents and businesses who provided feedback. All comments, feedback and submissions were taken into consideration for the final reports.

For more information on the reports, please email: flood.mitigation@nt.gov.au.

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Last updated: 09 April 2018