Tangari Regional Park Drainage Work

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Stormwater erosion in the Tangari Regional Park, Woodcroft

Work is now completed.

Tangari is a popular recreational destination with areas of high conservation value. Dedicated walking trails throughout the park ensure the protection of these areas.

The park also includes a creek line and two dams (upper and lower), originally built to supply water for stock. In 2009, as part of improvements to the trail network, a timber bridge was constructed over the overflow weir of the lower dam for pedestrian access. At that time overflow was gently graded downstream for approximately 15m to where a small erosion gully had formed

Time and heavy rainfalls in recent years has contributed to more significant erosion that without any intervention could result in the undermining of the bridge and possibly the dam wall, causing further damage to the surrounding area.

What was the Solution?

The solution was to redirect stormwater flows from the existing lower dam via new stormwater culverts to the existing dry basin to the north. Water will now gravitate to the existing creek alignment further north through low flow stormwater culverts placed under an elevated path to maintain pedestrian access.

The existing erosion to the east of the lower dam and footbridge will be filled with soil to match the surrounding surface levels and vegetation will be reinstated.

FURTHER INFORMATION

To read more, please see the Project Information in the document library.




Stormwater erosion in the Tangari Regional Park, Woodcroft

Work is now completed.

Tangari is a popular recreational destination with areas of high conservation value. Dedicated walking trails throughout the park ensure the protection of these areas.

The park also includes a creek line and two dams (upper and lower), originally built to supply water for stock. In 2009, as part of improvements to the trail network, a timber bridge was constructed over the overflow weir of the lower dam for pedestrian access. At that time overflow was gently graded downstream for approximately 15m to where a small erosion gully had formed

Time and heavy rainfalls in recent years has contributed to more significant erosion that without any intervention could result in the undermining of the bridge and possibly the dam wall, causing further damage to the surrounding area.

What was the Solution?

The solution was to redirect stormwater flows from the existing lower dam via new stormwater culverts to the existing dry basin to the north. Water will now gravitate to the existing creek alignment further north through low flow stormwater culverts placed under an elevated path to maintain pedestrian access.

The existing erosion to the east of the lower dam and footbridge will be filled with soil to match the surrounding surface levels and vegetation will be reinstated.

FURTHER INFORMATION

To read more, please see the Project Information in the document library.




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