Oldham Creek
Stopbank works to protect the banks of Oldham Creek including remedial solutions like rock armouring and addressing the settlement issues of retaining walls.
Wider Nelson experienced flooding in August 2022 and May 2023. Several intake structures and streams suffered severe damage, including bank erosion and damage to the culverts.
Benefits and resilience
This group of projects will reduce the flood risk significantly for hundreds of Nelsonians, including reducing the impact of flooding for surrounding properties, and helping to increase resilience against damage caused by flood and storm events.
Repair works consist of the following:
Nelson wide projects
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Hillwood Stream Floodway
Tthis includes an investigation phase, with potential options including a stopbank to divert the flow, stream capacity improvements and a floodwall to reduce the risk of flooding.
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Todd Valley Culvert Upgrade
The three culverts in Todd Valley are undersized and require an upgrade to meet the current and future flow requirements. This part of the project aims to replace these culverts to meet Nelson Tasman Land Development Manual (NTLDM) Standards.
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Seafield Terrace Drainage
Installing a new stormwater culvert and drainage improvement works.
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Devenish Place Intake
Iinstalling a barrier to collect debris and prevent it from entering and potentially blocking the stormwater network.
Maitai Valley projects
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Cleveland Terrace Stormwater Intake
COMPLETED. This part of the project is designed to upsize the headwall and culvert to reduce the area's flooding risk, bringing more capacity into the network.
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Queen’s Garden Drainage Diversion
The properties surrounding the Queen's Garden suffered flooding during the August 2022 event due to the backflow from the Maitai River through the stormwater network. Investigations are progressing to determine the options to lay a new stormwater outlet pipe from Queen’s Garden to further downstream on the Maitai River that can reduce the risk of flooding the garden and nearby properties.
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Maitai Flood Mitigation
UNDERWAY. Clouston Terrace – Hanby Park Stopbank – Clouston Bridge Floodwall: Maitai River overtopped several sections of the stopbank during both flood events. This project is in the design phase and is exploring potential options including raising the stopbank along the existing alignment, building floodwalls and/or creating a floodway to reduce the risk of flooding in the region and improve resilience for residents and properties in the area.
