Sandbag Use

In the Western Bay of Plenty, when large high tides or ‘king tides’ occur, only a small-to-moderate storm surge is required to flood some areas. This could be caused simply by strong winds and ocean swell. Heavy rainfall can also cause localised flooding.

Sandbags are useful for addressing localised flooding, for example to stop water flowing under a garage door or diverting water downhill. But they don't protect against water coming from under a house and through floorboards.

As a general rule, residents are responsible for providing their own sandbags in preparation for a storm event.

If a property is regularly subjected to flooding then it is the property owner's responsibility to be proactive and take such precautions to protect themselves and their property. This can include ensuring street storm-water grates are clear of debris.

During storm events and flooding, maintenance crews employed by Council are focused on maintaining the function and safety of key infrastructure such as roads, storm-water, water and sewerage.

Available resources are typically limited during these times, so crews will be prioritised to where they can provide the greatest effect.

There will be exceptions, where we know a situation exists. In such instances we monitor those trouble spots as a protection measure and are ready to act as required.

Please remember - if you are in danger or your property is under immediate threat during a storm event please contact emergency services on 111.

Alternative solution

Sheets of PVC are a practical way to waterproof around doors provided they are fixed in place adequately.

Purchasing sandbags

Sandbags are usually available from hardware and DIY stores. They require time and effort to fill and place, therefore they generally need to be filled and placed in advance of an event rather than in the middle of an event.

Sandbags are not waterproof and are best used for directing water flow rather than keeping property dry.

Filling sandbags

• Garden centres have heavy soil or sand that can be used to fill sandbags, or use soil from your garden.
• Don’t use gravelly or rocky soils, as this will let the water through. It’s easiest if two people are involved – one to hold the bag and the other to shovel the soil or sand in. Don't fill sandbags beyond two thirds full.

Building a sandbag wall

• Place your first row of sandbags lengthwise and flat to the ground, butting each end to the next, folding the open end of the sandbag underneath. Stamp them into place to remove air pockets
• Place the second row of sandbags on top staggering the joints, compacting each sandbag as you go
• If you are using plastic sheeting, place it in front of the sandbags, between them and the water, then weigh down the bottom and top with extra sandbags.

Drying sandbags for reuse

• When the water has receded, separate your sandbags, lay them out or stand them up and let them dry out thoroughly
• When they are dry, store them for use again. Wet sandbags will rot or deteriorate quickly

Handy tips:

Only fill bags to half or two-thirds full. This gives the soil or sand room to expand as it absorbs the water.

Don’t tie or seal the bag – when you put it in place, fold the flap into a triangle and tuck it under the bag.

Download our Guide to filling and using sandbags below