Porters Creek Dam Reopens
February 23, 2017
Shoalhaven Water has officially opened the upgraded Porters Creek Dam, half a century after the initial dam construction in 1967. The dam provides approximately 30% of Southern Shoalhaven’s drinking water supply and has a reservoir capacity of 1,900 mega litres.
Carmel Krogh, Director Shoalhaven Water is proud of the outcomes of the upgrade from a number of perspectives, saying “The dam upgrade is a major milestone for Shoalhaven Water. It will ensure we have adequate water supply for the southern Shoalhaven in the future. The dam was built on time and under budget and included 25,000 man hours to upgrade.” She also emphasized the quality or personnel involved in the project and stated “Not only has this project brought together technical and complex inputs from great teams of people but has also been fascinating from an historical perspective. This dam project is as much about people as it is about engineering.”
Carmel was particularly pleased that the new project provided some fascinating linkages with the original dam. “The original dam was constructed in 1967 by Shoalhaven Shire Council and was designed and supervised by the engineering firm Gutteridge Haskins and Davy (GHD). A young 17 year old named Laurie Andrew started his working life at that time as a trainee surveyor on that dam project. Fifty years later GHD designed the upgrade and that same Laurie Andrew works for Shoalhaven City Council and acted as Council’s site supervisor for the upgrade”.
The original dam consisted of a 17 metre high by 139 metre long post-tensioned concrete gravity section with an overflow spillway integral with the crest. The upgrade commenced in March 2016 and eight months later, a new dam wall involved the construction of 4,500m3 of concrete gravity buttress and stilling basin has been constructed.
The upgrade of the dam was in response to meet safety requirements, to ensure longevity of the dam structure and consequently meet the future water supply demands of the Milton and Ulladulla communities. The upgrade also included the 3.6km of Porters Creed Rd sealed from the Princes Hwy to Graydon Pointer Rd.