Specialforces.com Breach Analysis

3/2/2012 2:11:34 AM #

"On some occasions a development site is defended by man made flood defences such as concrete walls or earth banks to protect lower lying land from flooding in storm events.

Defences are designed to certain criteria dependant upon what, and the amount of development they protect.  Defences can protect land from events from 1 in 20 years up to 1 in 1000 years.

If a potential development is in an area defined as being protected by defences, then on some occasions it is necessary to assess the level of risk to a site if the defences were to breach.

A breach in a defence is where the defence fails and collapses leaving a hole for water to flow through. A Breach analysis assesses the velocity, rate of inundation and depth of flood water anticipated which can determine if a development is safe or not.

A second assessment can also be required which is for overlapping of defences which is essentially when a defence designed to withstand a 1 in 100 year storm event is subjected to water levels from say a 1 in 150 year event and water levels exceed the defence levels. This is usually a lower risk to a development than a breach as there is usually less volume of water overtopping a defence than if there is a breach."

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3/17/2012 6:40:57 PM #

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4/19/2012 3:22:04 AM #

Ho sempre insistendo mio padre che non tutti i titoli pubblicati sul web sono originali ma questo post è di solito un eccezionale per la mia regola.

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