The Central Coast has the third largest urban water supply system in New South Wales, Australia. The water supply system serves the region’s population of almost 400,000 people.
The Mangrove Creek Dam, located 50km northwest of Gosford, is the Central Coast’s largest dam. Constructed between 1978 and 1982, the dam provides almost 93 percent of the region’s water storage with a maximum capacity of 190,000 million litres of water. Mangrove Creek Dam is a concrete faced rockfill dam that provides on-stream storage of water. The dam has a catchment area of 101 square kilometers and provides water to both Gosford City and Wyong Shire.
Previous remotely operated vehicle (ROV) inspections had produced inconclusive results due to the poor quality and lack of coverage of the underwater imagery obtained.
Abyss Solutions conducted an underwater ROV inspection of the Mangrove Creek Dam Diversion Tunnel using its world leading underwater imaging and lighting technology. The inspection aimed to collect high resolution imagery of the inside of the tunnel and intake tower shaft to assist the Council in identifying any significant defects in this critical asset
The inspection involved the following:
1. Collection of video imagery using a ROV equipped with a customized computer vision camera. The ROV was lowered down the shaft and subsequently navigated through the upstream and downstream ends of the tunnel under the guidance and instruction of a member of Central Coast Council. Video was continuously captured during this process.
2. Algorithmically enhancing the video imagery to improve its clarity and color representation in the turbid and low environment of the tunnel interior.
The results from the high resolution video imagery provided the Council with detailed information of the condition of the diversion tunnel which was generally good.
Mangrove Creek Dam Diversion Tunnel Inspection
Gosford, NSW, Australia
Central Coast Council