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How do you prevent cyclone damages?

Updated: 3/30/2022
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8y ago

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he north west of Australia, the "cyclone alley", threw out the building codes for cyclone prone areas after cyclone Tracy flattened Darwin in 1974. They rewrote the book and made major changes to how homes and buildings are constructed (and where). Some of the changes include:

* Homes are required to have rooves with a gradient incline of at least 20 degrees. This helps prevent the roof being sucked off a home from the difference in air pressure between the air above the roof and that inside below it. Residents are advised to keep a window away from the wind slightly ajar to release the air pressure (this is reversed to the other side of the house when the cyclone eye passes over and the wind changes to the other direction)

* Homes must have foundations that go right into the ground. They cannot just lay a concrete pad and build on top of it. It has to be anchored well below the surface.

* Brick homes are required to use bricks that allow steel rods to be inserted in specials holes in the bricks that not only make the walls stronger, they also attach to the foundations and the roof, making the entire structure stronger.

* Every single roof tile, when tiles are used, must be nailed down on every single row. In other areas of Australia only the bottom row is nailed down.

* Steel rooves have steel battons bolted at close intervals along every eave so that the metal doesn't lift off during a cyclone.

* All windows are required to have either bullet glass or fitted with cyclone screen to protect from flying debris.

* Towns have zoning regulations that do not allow homes to built below the high tide surge line in coastal areas. When a cyclone passes through during high tide (as cyclone Yasi did recently) the pressure difference caused by the cyclone can raise the tide even higher and flood towns built into the danger zone. This is why Karratha in the Pilbara, despite being sandwiched between the shore and a hilly range, has homes built 2 kms from the shore line in areas subject to tidal surges.

* Before the regular cyclone "season" begins, local councils have a major town cleanup. Council Prunes back (quite severely in many cases) trees that are likely to pose a hazard to power lines in every street. Residents are advised to store or tie down anything that can become flying debris during cyclonic winds. Everyone is advised of the cyclone alert system and what to do during one.

* Every public building is required to be built not just to the highest cyclone ratings, but to to also be used as a refuge shelter from cyclones. People who have to evacuate from tourist camping parks or other places use these public buildings during "lock down" as the cyclone passes.

* There are height limits to the scale of buildings. High-rise buildings are positively disallowed.

There are probably may other changes that have been made that don't come to mind right now. I know they have been strengthened even more in recent years with the increasing numbers of category 5 cyclones crossing the north west coast line.

Source(s):My family moved to Karratha in 1976 (2 years after cyclone Tracy hit). Karratha was just beginning then. I lived there for nearly 15 years as a kid and saw first hand as suburbs went up just how the building codes had changed over the years.
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Juliet Olson

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1y ago
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11y ago

he north west of Australia, the "cyclone alley", threw out the building codes for cyclone prone areas after cyclone Tracy flattened Darwin in 1974. They rewrote the book and made major changes to how homes and buildings are constructed (and where). Some of the changes include:

* Homes are required to have rooves with a gradient incline of at least 20 degrees. This helps prevent the roof being sucked off a home from the difference in air pressure between the air above the roof and that inside below it. Residents are advised to keep a window away from the wind slightly ajar to release the air pressure (this is reversed to the other side of the house when the cyclone eye passes over and the wind changes to the other direction)

* Homes must have foundations that go right into the ground. They cannot just lay a concrete pad and build on top of it. It has to be anchored well below the surface.

* Brick homes are required to use bricks that allow steel rods to be inserted in specials holes in the bricks that not only make the walls stronger, they also attach to the foundations and the roof, making the entire structure stronger.

* Every single roof tile, when tiles are used, must be nailed down on every single row. In other areas of Australia only the bottom row is nailed down.

* Steel rooves have steel battons bolted at close intervals along every eave so that the metal doesn't lift off during a cyclone.

* All windows are required to have either bullet glass or fitted with cyclone screen to protect from flying debris.

* Towns have zoning regulations that do not allow homes to built below the high tide surge line in coastal areas. When a cyclone passes through during high tide (as cyclone Yasi did recently) the pressure difference caused by the cyclone can raise the tide even higher and flood towns built into the danger zone. This is why Karratha in the Pilbara, despite being sandwiched between the shore and a hilly range, has homes built 2 kms from the shore line in areas subject to tidal surges.

* Before the regular cyclone "season" begins, local councils have a major town cleanup. Council Prunes back (quite severely in many cases) trees that are likely to pose a hazard to power lines in every street. Residents are advised to store or tie down anything that can become flying debris during cyclonic winds. Everyone is advised of the cyclone alert system and what to do during one.

* Every public building is required to be built not just to the highest cyclone ratings, but to to also be used as a refuge shelter from cyclones. People who have to evacuate from tourist camping parks or other places use these public buildings during "lock down" as the cyclone passes.

* There are height limits to the scale of buildings. High-rise buildings are positively disallowed.

There are probably may other changes that have been made that don't come to mind right now. I know they have been strengthened even more in recent years with the increasing numbers of category 5 cyclones crossing the north west coast line.

Source(s):My family moved to Karratha in 1976 (2 years after cyclone Tracy hit). Karratha was just beginning then. I lived there for nearly 15 years as a kid and saw first hand as suburbs went up just how the building codes had changed over the years.
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