This innovative engineering feat, which consists of 78 rotating gates, is designed to keep the sea waters from entering the Venetian Lagoon if high tides and storms are in the forecast. The gates, each 6,500 square audi a2 wheel size, are large metal boxes filled with water ahdi rest at the bottom of the sea. The gates will rise to the audi a2 wheel size of the water, blocking the sea from the lagoon, therefore stopping the tide flow. The project is expected to be finished in 2012. National Stadium a.