Dam Spillway at Conondale QLD – 0143

PROJECT:

To repair a dam spillway that was eroding after every rain event.  

LOCATION:

Harpers Creek Road CONONDALE QLD 4552

PROJECT STATS:

• 57 square metres
• 2 rolls – 2.4m wide x 12m mat
• Underlay geotextile was Non-woven underlay
• 1 x 5 ton excavator with bucket
• 1 operator and 1 labourer
• 5 hours start to finish  

OUR REF: ACM 0143

PROJECT OVERVIEW

This dam spillway was continuously getting worn away after every rain event. The property owner required flows to be controlled and spillways constructed in a way that would protect the spillway from further erosion and also prevent it from future erosion. He also needed good access so he could mow with his slasher in the future without damaging the dam edges.

WORKS UNDERTAKEN

• Excavator was used to clear and prepare and reshape the spillway
• The cleared area was seeded for grass to grow under the mat
• Spillway was then seeded
• Concrete Erosion rolls were placed into position and unrolled across the cleared areas
• The flexible nature of the mats ensured that it easily contoured to the curves of the spillway
• The bucket of the excavator simply pulled the mat to straighten and into position
• irrigated to establish the grass that would help to stabilise the site
•  

RESULTS & BENEFITS:

• Reduced flow speed and therefore potential erosion of the water as it flowed across the concrete mat
• The mat and seeded area was irrigated to establish the grass
• Spillway was stabilised and able to be easily and safely mowed
• Sediment loss was reduced
• Very efficient with time and resources
• The works were completed swiftly, with minimal labour and effort
• Once laid the mats start working straight away

TIME:

• 6 weeks after installation grass had grown through and covered the mat.