Premier Dominic Perrottet on Wednesday announced he would push ahead with a $1.7 billion project to raise the wall of Warragamba Dam by up to 14 metres. Yet there remain some serious questions about the state government’s plan to protect 134,000 residents of the Hawkesbury-Nepean flood plain from the risk of inundation. Federal Emergency Management Agency (FEMA) Guidance on Retrofitting Your Home for Flooding From Ready.As Sydney is again drenched by enough rain to tip the city over into its wettest year in history, the danger posed to low-lying regions by flooding is only too obvious.American Red Cross Repairing Your Flooded Home. Try these links to detailed information about flood preparedness and floodproofing. Unless butted up to land contours or floodwalls, sandbagging by itself, is frequently insufficient for most residential protection needs. According to a commonly used formula, it takes 100 sandbags to produce a 1 foot high wall, 20 feet in length. Most do not understand the number of sandbags or the proper placement required to construct a wall that will withstand the pressure exerted by floodwater. Sandbagging is expensive, manpower intensive and less secure than other flood proofing methods. Sandbagging's primary effectiveness is in conjunction with other flood countermeasures such as closing openings in existing flood walls or berms. When flooding is imminent, everyone wants to sandbag, often because they don't know what else to do or have no other flood proofing measures in place. Difficult to move objects like furnaces, appliances are either on elevated platforms, walled off, or installed on upper floors. In rooms below flood level, furnishings are lightweight and easily removed before a flood.
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