As an essential and one of Brisbane’s largest potable water assets, Green Hill Reservoir No 1 & No 2 in Chapel Hill were in need of significant refurbishment in order for Seqwater to maintain its high standards for water supply. These structures were built in 1968 and required detailed inspection and repair of all defects.
Rob Carr Pty Ltd was engaged by Seqwater to initially clean the Reservoir No 1, conduct a detailed inspection of the reservoir structure in conjunction with Seqwater representatives and provide Seqwater with a detailed report on its findings. Upon provision of the report, Rob Carr Pty Ltd supplied Seqwater with detailed designs for repairs of the identified structural damage. The roof of the reservoir in particular, was in dire need of repair as the roof was leaking due to major cracks and other multiple defects in the roof slab structure and existing expansion joints.
Rob Carr Pty Ltd specifically selected LRM Products VersEseal membrane system which provided Seqwater with a high quality solution at a competitive price. The membrane eventually covered the entire roof slab of both reservoirs (No 1 and No 2) which comprise 15,000m2 combined. Rob Carr additionally designed a system to prevent the ingress of water through these same expansion joints, cracks and saw cuts on the roof using the same product. Upon completion of all joint and crack repairs, the VersEseal membrane was sprayed on the entire roof surface sealing both reservoirs from any water ingress. Considering the enormity of the two reservoir structures (155ML), the height of the walls and columns was restrictive. Rob Carr used 3 x 20m Knuckle Booms inside the reservoir to undertake the works safely and efficiently inside the reservoir.
Rob Carr self performed the majority of work undertaking all supply, condition assessment, repairs, waterproofing, delivery, QS&E project management and commissioning of the reservoirs.