Scrivener Dam, designed in Germany, holds back the waters of the Molonglo River within Lake Burley Griffin. About of concrete was used in the construction of the dam wall. The dam is high and long with a maximum wall thickness of. The dam is designed to handle a once in 5,000 year flood event. It utilised state-of-the-art post-tensioning techniques to cope with any problems or movements in the riverbed. The dam has five bay spillways controlled by wide, hydraulically operated fish-belly flap gates. Hinge anchors support the flap gates; with six hinges per gate, and four anchors per hinge. The fish-belly gates allow for a precise control of water level, reducing the dead area on the banks between high and low water levels. As at November 2010, the five gates have only been opened simultaneously once in the dam's history, during heavy flooding in 1976. The dam wall provides a crossing for the lake and consists of a roadway, called Lady Denman Drive, and a bicycle path. The roadway was possible because the dam gates are closed by pushing up from below, unlike most previous designs that wherein the gates were lifted from above.
Dam maintenance
The National Capital Authority, a statutory authority of the Australian Government, is responsible for the administration and oversight of Scrivener Dam, as the dam lies within the Designated Area, under the. The Authority manages external contractors to deliver services that are competitively tendered. A routine annual audit of the dam wall undertaken during 2011 revealed that the anchor bolts, which are part of the flap gate hinge mechanism, showed signs of corrosion. These bolts, of which there are 120 in total, are each in diameter and long. It was anticipated that work would be completed by the end of 2013, and cost A$20m.
Flood mitigation
Scrivener Dam is operated in an environment that minimises flooding of the environs of Lake Burley Griffin. Flows of and above at the dam spillway are achieved with all five floodgates open and are able to maintain the normal level of the Lake at, measured at the East Basin. With three floodgates open, outflows of can be achieved through either automatic or manual operation of the dam. A minimum base flow of is required in the Molonglo River, downstream of Scrivener Dam at the gauging station below Coppins Crossing.
History
Lake filling
A prolonged drought coincided with and eased work on the lake's construction. The valves on the Scrivener Dam were closed on 20 September 1963 by Interior MinisterGordon Freeth; Prime Minister Menzies was absent due to ill health. Several months on, with no rain in sight, mosquito-infested pools of water were the only visible sign of the lake filling. With the eventual breaking of the drought and several days of heavy rain, the lake filled, and reached the planned level on 29 April 1964. On 17 October 1964, Menzies commemorated the filling of the lake and the completion of stage one with an opening ceremony amid the backdrop of sailing craft. This was accompanied by fireworks display, and Griffin's lake had finally come to fruition after five decades, at the cost of 5,039,050. The dam, together with Lake Burley Griffin and adjacent lands, is listed on the Register of the National Estate, a listing of places of significant natural and cultural heritage. Since 2012, the register has frozen.
