WaterTech Black Creek Diversion ERSED
Client: Water Technology
GeoLINK has been engaged by Water Technology to prepare an erosion and sediment control plan for the construction and operation of the Black Creek diversion channel for the Tarong Power Station in Queensland.
The channel will be just over three kilometres in length, and an average of 20 metres wide, emanating from the existing Black Creek Dam and making its way to the discharge location at Meandu Creek. The upper two kilometres of the channel will be at roughly 0.1% grade, whereas the lower section will be much steeper, dropping 38 metres over 830 metres. This lower section will comprise a number of drop structures, designed to control flow velocities and dissipate energy generated by the steeper grade of this section, through the generation of a hydraulic jump within each structure. The channel design will also include two large online sediment basins, to capture sediment and prevent it from entering the receiving waters downstream. Aside from these two basins, the channel will be self-cleansing, to minimise maintenance requirements.
The channel has been designed to transport flows generated by a 1-in-100-year average recurrence interval flood event, with a design life of 25 years. Its primary purpose is to intercept stormwater runoff and overflow from a number of water retaining structures before it enters the ash dam associated with the Tarong Power Station, thereby increasing the capacity and expected lifespan of the ash dam.
Erosion and sediment control measures will be designed for both the construction and operation of the channel, taking into particular consideration the opportunities to prevent erosion during the significant excavation requirements and erosion of the channel batter slopes. GeoLINK’s Michelle Erwin will put to good use her expertise in erosion and sediment control during the course of this project.