Penrith. Engineering works cost $39 million

Engineers are putting put the finishing touches to a network of ''fishways'' and modified weirs that are expected to boost flows along the Hawkesbury-Nepean River Water will now be sent downstream in cycles timed with rainfall and drought, and in some years the environmental flows will increase tenfold on current levels, meaning up to 240 million litres a day will flow downstream into Broken Bay. The engineering work, which cost $39 million, will give native plants and fauna a fighting chance against invasive species.