Defence Logistics
Flood Defence Tips – How To Use Traditional Sandbags
Sandbags have long been a primary tool in any flood defence arsenal. They are perhaps not the most effective measure to prevent flood waters but they can provide a temporary solution. They are useful for blocking doorways, drains, vents and for building more substantial sandbag walls to hold back rivers and rising flood waters.
Filling sandbags takes time – image FEMA
Whilst sandbags are a cheap solution for flood defence, there are disadvantages to using traditional sand-filled sandbags:
* They take time to fill – a dozen sandbags will take about an hour to fill
* They are cumbersome and heavy to handle and transport
* The are not biodegradable or very eco friendly
* It takes two people to fill them properly
* They are only effective if they are properly filled.
Because filling and using sandbags correctly is important to their effectiveness, it’s essential to get it right first time; so here is the correct procedure for filling and utilising sandbags:
Firstly, it’s a two man job. One person needs to hold the empty sack (sandbag) the other should fill it with a shovel or spade. The sandbags should not be overfilled, halfway is sufficient otherwise they won’t mesh together and water will seep through. The sandbag doesn’t need to be tied but its worth folding the end over to prevent them getting kicked over as you fill them.
Secondly, when placing sandbags make sure the area is cleared of any rubbish or debris. A ground sheet is preferred but this is not always possible. The half-filled sandbags should be laid lengthways and the bags should be stacked in layers like a brick-wall with each layer overlapping the previous. Pat down the sandbag wall to ensure there are no gaps otherwise water may get through.
Remember, sandbags are not the most effective flood defence measure. As you can see, they are time consuming to fill so they need to be prepared in advance. Getting access to sandbags and transporting them whilst full can be a logistical nightmare so be prepared as much in advance as you can.
There are alternatives to the traditional sandbag. Instant sandbags work in much the same way except the require no sand, require just water to fill, can inflate in minutes and be stored flat and taken out only when needed.
About the Author
.Richard N Williams is a technical author and professional writer who is interested in floodinf, flood defences and flood management. Please visit us if you would like more information about flood prevention or require more information on Instant Sandbags
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