How to Prepare Your Pond for Storm Austen: Essential Tips to Protect Your Fish and Pond

Storm Austen is approaching the UK, bringing strong winds, heavy rain and potentially disruptive weather. Is your garden pond ready?

With the Met Office issuing weather warnings ahead of Storm Austen, pond owners across the UK should take a few simple precautions to protect their koi, goldfish, pond equipment and water quality.

Strong winds can blow leaves and debris into ponds, heavy rainfall can affect water conditions, and flooding may introduce unwanted contaminants.

Fortunately, preparing your fish pond for stormy weather doesn't have to be complicated.

At Pond Supplies Essex, we've put together eight practical steps to help protect your pond before, during and after Storm Austen.

When Will Storm Austen Hit the UK?

According to the Met Office's Storm Austen update, published on 21 October 2026, Storm Austen is expected to affect southern parts of the UK from Thursday evening, 22 October, into Friday, 23 October.

An amber wind warning has been issued for Cornwall, the Isles of Scilly and parts of West Devon, with wider wind warnings covering additional areas.

Even outside the worst-affected regions, pond owners should prepare for unsettled autumn weather and monitor local forecasts.

Here are the essential steps to take before severe weather arrives.

1. Remove Leaves and Debris Before the Storm

One of the simplest ways to protect your pond during heavy winds is to remove accumulated leaves, twigs and floating debris.

Stormy weather can quickly blow additional organic material into garden ponds, particularly those surrounded by trees.

If left to decompose, this debris can increase organic waste, contribute to sludge accumulation and place additional pressure on your pond filtration system.

What to do:

• Remove floating leaves using a pond net or skimmer.

• Clear loose debris from the surrounding pond area.

• Check that pond skimmer baskets aren't blocked.

• Remove vulnerable fallen branches before strong winds arrive, provided it is safe.

Explore our pond skimmers and surface cleaning equipment to help maintain a cleaner pond.

2. Secure Your Pond Cover Netting

A properly fitted pond cover net can help prevent autumn leaves and garden debris from entering your pond.

However, strong winds can loosen poorly secured netting.

Before Storm Austen arrives, check that your pond cover net is firmly anchored and free from damage.

Our recommendations:

• Check all fixing pegs and attachment points.

• Ensure netting is correctly tensioned.

• Remove leaves already collected on the net.

• Check that the net cannot collapse into the water or trap wildlife.

If your net cannot be safely secured against forecast winds, remove it before conditions deteriorate rather than allowing it to become dangerous.

For long-term pond protection, explore our Pond Cover Nets Collection.

You can also read our Autumn Pond Netting Guide for further seasonal advice.

3. Check Your Pond Water Level and Overflow

Heavy rainfall can cause pond water levels to rise quickly.

This can become particularly problematic for ponds situated on sloping ground or in gardens where surface water collects.

Excessive water levels may allow fish to escape, carry debris into the pond or cause flooding around electrical equipment.

Before the storm:

• Inspect existing pond overflow outlets.

• Clear blocked drainage channels.

• Check that overflowing water can drain safely away from your home and electrical equipment.

• Reduce the risk of contaminated garden runoff entering the pond.

Avoid draining large amounts of healthy pond water unnecessarily. A properly designed overflow is preferable to making sudden, significant changes to the water level.

4. Inspect Your Pond Pump, Filter and Electrical Equipment

Your pond filtration system is essential for maintaining healthy water conditions.

Strong winds and heavy rain can damage exposed equipment, dislodge hoses or interfere with electrical connections.

Before severe weather arrives, inspect accessible equipment while conditions are safe.

Important checks include:

• Ensure external filters and equipment are stable.

• Check that hoses and pipe fittings are securely connected.

• Make sure electrical connections are appropriately weather-protected.

• Confirm your outdoor electrical supply has suitable RCD protection.

• Check that your filter and pump are operating normally.

Do not switch off your biological filtration system unnecessarily, as prolonged interruptions can affect beneficial bacteria and water quality.

Safety first: Never enter floodwater or handle damaged electrical equipment in wet conditions. If electrical equipment is exposed, damaged or unsafe, keep clear and seek assistance from a qualified electrician.

5. Maintain Good Pond Aeration

Healthy oxygen levels remain important throughout autumn, particularly in heavily stocked koi ponds.

Pond aeration helps support fish health and provides oxygen for the beneficial bacteria within biological filtration systems.

If storm damage or a power interruption stops the pond pump, an independent aeration system may provide additional resilience where a safe power supply remains available.

Check that your existing air pump, air stones and airline connections are operating correctly before the storm.

Browse our Pond Air Pumps & Accessories Collection for pond aeration equipment.

6. Protect Your Koi and Pond Fish From Storm-Related Stress

Koi and goldfish are generally capable of coping with normal changes in weather when their pond environment is stable.

However, sudden water-quality changes, contamination, equipment failures and flooding can create unnecessary risks.

Before the storm, focus on maintaining normal pond conditions.

Avoid unnecessary major water changes, excessive feeding or introducing treatments without identifying a specific problem.

As temperatures fall during autumn, review your fish feeding routine according to actual pond water temperature and fish activity.

Discover our range of Pond Fish Food, including seasonal feeding options.

7. Prevent Garden Runoff From Entering Your Pond

One risk during prolonged heavy rainfall is contaminated surface water entering your pond.

Rainwater flowing across gardens, lawns or patios can carry soil, fertilisers, pesticides and other pollutants.

These contaminants can affect water quality and potentially harm aquatic life.

To reduce this risk:

• Check that surrounding drainage directs runoff away from the pond.

• Remove loose garden chemicals and fertilisers from exposed areas.

• Make sure raised pond edges and overflow systems are clear.

• Avoid allowing muddy surface water to wash directly into the pond.

If you suspect contamination after the storm, test the water and seek appropriate advice before adding pond treatments.

8. Test Your Pond Water After Storm Austen

Once conditions are safe, inspect your pond for any changes.

Heavy rainfall and contaminated runoff can affect water chemistry, particularly in ponds with limited buffering capacity.

Testing helps you understand whether action is needed rather than making unnecessary changes.

Important water parameters to check include:

• pH: Helps identify potentially harmful acidity or alkalinity changes.

• KH (carbonate hardness): Indicates the water's buffering capacity and resistance to pH changes.

• Ammonia: Can indicate increased waste or filtration problems.

• Nitrite: Helps assess whether biological filtration is processing waste effectively.

Observe your fish for unusual behaviour, gasping, injury or signs of distress.

If any readings are abnormal, identify the likely cause and correct conditions gradually where possible.

When replacing pond water with mains tap water, always use a suitable dechlorinator.

Explore our Pond Water Conditioners.

What Should You Do After Storm Austen Has Passed?

After severe weather, inspect your pond carefully once it is safe to go outside.

Your post-storm pond checklist:

• Remove accumulated leaves and floating debris.

• Check pond netting and surrounding structures for damage.

• Inspect pumps, filters and pipework.

• Confirm that water is circulating and aeration is operating normally.

• Check your pond water level.

• Test water quality if flooding, runoff or unusual changes have occurred.

• Observe your koi and pond fish for abnormal behaviour.

Small preventative measures can help avoid more significant maintenance problems later.

Frequently Asked Questions

Can heavy rain harm koi fish?

Rainfall itself is not automatically harmful to koi. However, excessive rain, contaminated runoff, flooding or sudden changes in water chemistry can create problems. Maintaining stable water conditions is the priority.

Should I turn off my pond pump during a storm?

Not routinely. Pond filtration and circulation are important for water quality. However, if electrical equipment becomes unsafe, follow appropriate electrical safety procedures and seek professional assistance. Never handle powered equipment in floodwater.

Do pond cover nets protect against strong winds?

Pond nets help reduce leaves and debris entering the water, but they are not designed to withstand every severe wind event. Check all fixings and ensure the net cannot become detached or dangerous.

Should I carry out a water change after heavy rain?

Not automatically. Test your water first and assess whether conditions have actually changed. Unnecessary large water changes can create additional stress for fish.

How can I protect my pond during future storms?

Routine pond maintenance, securely fitted netting, reliable filtration, suitable drainage and regular water testing are all valuable parts of long-term storm preparation.

Prepare Your Pond Before Severe Weather Arrives

Storm Austen is a timely reminder of the importance of maintaining a healthy, well-protected garden pond.

Whether you're caring for a small ornamental pond or a large koi pond, simple preparation can help reduce the risks associated with strong winds, heavy rainfall and autumn debris.

At Pond Supplies Essex, we supply pond cover nets, filtration equipment, pond pumps, aeration systems, water treatments and fish food to help UK pond owners maintain healthier ponds throughout the year.

Prepare today. Protect your fish. Keep your pond healthy.

Shop Pond Supplies Online – PondSuppliesEssex.com

Trust the Aquatic Experts.

Weather information based on the Met Office update published 21 October 2026. Always check the latest official weather warnings before undertaking outdoor work.