Mangrove Creek Dam Probable Maximum Flood Upgrade

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REGIONAL WATER SECURITY & SEWER UPGRADES MANGROVE CREEK DAM PROBABLE MAXIMUM FLOOD UPGRADE What’s needed? State Government: Description Construction of an upgraded spillway and parapet wall at the Mangrove • Funding of $6m for the project. Creek Dam (MCD) will increase water storage by 38,000ml and ensure • Central Coast Council will dam safety. undertake the management of the project. Mangrove Creek Dam (MCD) is the key water storage for the Central Coast and with a capacity of 190,000ml, represents approximately 94% What’s been done? of the total storage capacity for the Central Coast. Revised flood analysis A preliminary concept design has has identified that the dam cannot meet the current NSW Dam Safety been developed by Council for Committee flood requirements for the Probable Maximum Flood (PMF). the construction of a parapet The dam is currently not permitted to be filled beyond 80% of capacity, wall and spillway. as this allows a flood to be buffered in the airspace of the unfilled portion of the dam to an extent that the PMF can safely pass through the existing spillway. Description (cont.) Benefits Construction of a parapet wall and spillway improvements will • Increase water storage capacity of the Central Coast (15 allow the PMF to pass and increase capability storage to 100%. months additional supply at current demand). This will ensure the safety of the dam and the downstream • Increase the ability to supply water to the Hunter under community and provide an additional 38,000ml of storage, the the Hunter Central Coast Pipeline agreement which is equivalent of 15 months water supply. a key element of the State Government’s Lower Hunter Water Plan. Design and procurement will take 18 months with construction • Greater utilisation of existing infrastructure and a further 9 months. investments. • Increased potential for enhanced environmental flows (enhanced environmental flow rules apply when total Central Coast storage levels exceed 60%)..

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