context: The reservoir has an ornamental surface with a length of 11 kilometers and a maximum width of 1.2 kilometers. The average depth is 4 meters, the maximum reaches 18 meters near the Scriviner dam. This 33 meter long dam regulates the filling of the reservoir. It is able to withstand particularly severe floods that occur once every 5 thousand years. In dry times, the water level can be maintained by lowering the Guglong Dam, located on the Quinbian River, the upper tributary of the Molonglo River.
question: What is the depth of Burley Griffin Lake?
answers.text: The average depth is 4 meters