Cockrone Lagoon Floodplain Management Plan

The Floodplain Management Plan divides the Cockrone Lagoon area into six precincts:\r\n\r\n* Cockrone Lagoon - Beach Berm High Hazard Floodway/Investigation\r\n* Cockrone Lagoon - Entrance Area High Hazard – Low Hazard\r\nFloodway/Investigation\r\n* Cockrone Lagoon - Storage Area Low Hazard Flood storage\r\n* Cockrone Lagoon - Floodway Area High Hazard Floodway\r\n* Merchants Creek - Floodway Area High Hazard Floodway\r\n* Newell Road Floodway High Hazard Floodway\r\n\r\nThese precincts have been classified for flood hazard as:\r\nHigh Hazard - Floodways\r\n- Cockrone Lagoon beach berm;\r\n- Cockrone Gully, from the upstream study boundary to its confluence with Cockrone\r\nLagoon (identified as Cockrone Lagoon floodway);\r\n- Merchants Creek floodway from the confluence of Merchants Creek with Cockrone\r\nLagoon to the upstream study extent; and\r\n- an existing open drain through the residential areas bounded by Newell Road and Three\r\nPoints Avenue.\r\nHigh Hazard – Low Hazard Floodway (Floodway Investigation area)\r\n- Cockrone Lagoon at its entrance to the ocean (Floodway/Investigation Area);\r\nLow Hazard - Flood Storage\r\n- Cockrone Lagoon and foreshores excepting high hazard areas above.\r\nThese precincts are illustrated on Figures 2 and 3, while Figure 4 provides greater detail in the Cockrone\r\nLagoon Entrance Area.\r\nCouncil has adopted a policy of opening the lagoons when water level reaches RL 2.53 m AHD (identified\r\nas the let-out-level). Council has, in the past, also adopted a policy that requires new buildings to have\r\nfloor levels above RL 4.3 m AHD. These two policies effectively constitute Council's current floodplain\r\nmanagement practice around Cockrone Lagoon.