2025-10454 Silver Stream Capacity Improvement – Package 1

Details

RFx ID :	31091346
Tender Name :	2025-10454 Silver Stream Capacity Improvement – Package 1
Reference # :	2025-10454
Open Date :	Monday, 17 February 2025 3:00 PM (Pacific/Auckland UTC+13:00)
Close Date  :	Monday, 10 March 2025 5:00 PM (Pacific/Auckland UTC+13:00)
Department/Business Unit :	Engineering
Tender Type :	Request for Tenders (RFT)
Tender Coverage :	Sole Agency  [?]
Categories :	22000000 - Building and Construction Machinery and Accessories 72000000 - Building and Facility Construction and Maintenance Services 77000000 - Environmental Services 83000000 - Public Utilities and Public Sector Related Services 93000000 - Politics and Civic Affairs Services
Regions:	Otago
Exemption Reason :	None
Required Pre-qualifications :	None
Contact :	Courtney Stevens engineering.procurement@orc.govt.nz 0272240743
Alternate Physical Delivery Address  :
Alternate Physical Fax Number  :

The Otago Regional Council (ORC) is seeking to improve the flood flow capacity of the Whakaehu / Silver Stream, a critical sub-catchment within the Lower Taieri River system. This watercourse serves as a floodway, and in the 1970s, a drainage scheme was implemented along an 8 km stretch of the Silver Stream to reduce flood risk for Mosgiel. This involved deepening the stream and constructing stopbanks. However, over time, sediment accumulation has diminished the stream’s ability to manage floodwaters, reducing its capacity.

To address this issue, ORC has obtained consent to remove accumulated sediment (alluvium) from outside the wetted bed. This initiative is intended to improve the stream’s flood capacity and while avoiding ecological impacts.