Flooding in Gardens
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FLOODING IN GARDENS HOW TO COPE WITH EXCESS WATER IN THE GARDEN IS YOUR GARDEN THREATENED BY FLOODS? Two million homes in England and Wales are at risk of flooding from rivers or the sea.The Environment Agency is responsible for flood defence, warning and communications to the people living in these properties. You can find out if you are at risk by calling Floodline on 0845 988 1188 or visiting the Environment Agency’s website at www.environment-agency.gov.uk/flood. If your home is at risk, there are simple steps you can take to lessen the distress and expense it may cause to you and your family. Even if your home itself is not flooded, floodwater can cause havoc in the garden, destroying years of dedicated effort and costly planting and landscaping. This guide shows how you can plan your garden to withstand the worst ravages of flooding and how to restore it if the worst happens. FLOODING. You can’t always prevent it, you can prepare for it In England and Wales the Environment Agency operates a flood warning service in areas at risk of flooding from rivers or the sea. If flooding is forecast, warnings are issued through the media or direct to people at home or work using a set of four easily recognised codes. Flooding possible. Be aware! Be prepared! Watch out! Flooding expected affecting homes, businesses and main roads.Act now! Severe flooding expected. Imminent danger to life and property.Act now! An all-clear will be issued when flood watches or warnings are no longer in force. Floodwater levels receding. Check all is safe to return. Seek advice. CONTENTS Preparing for a flood 2 If floods are imminent 4 After a flood 5 Restoring your garden 6 What to do with your plants 7 Minimising future flood damage 8 Flood-resistant planting 10 Vegetables, lawns and wildlife 12 The Environment Agency and Gardening Which? 13 PREPARING FOR A FLOOD WHY FLOODING IS A PROBLEM BEFORE A FLOOD In autumn 2000, Britain experienced some GCall Floodline on 0845 988 1188 for of the heaviest rainfall in years, leading to free information, including a factsheet severe and widespread flooding.A further pack, a Flood Directory about the outbreak of flooding in autumn 2001 had warning service in your area and even more impact than the previous year’s a handy guide on how to flood-proof floods in some areas. your home. GKeep a list of useful telephone numbers In the worst affected places, gardens were to hand – your local authority, completely devastated by the direct impact emergency services, insurance company of the floods; others became overgrown and Floodline. and neglected as people moved out of GTalk to your family, friends and their homes for months. Frequently, neighbours about what you would do, gardens were used as temporary parking and prepare a flood plan together. spaces for caravans housing flood victims. Discuss what you might need in the Long after the water levels subsided, event of a flood. gardeners found that plants had suffered GMake up a flood kit. Include a torch, damage from the storms and waterlogging. blankets, a portable radio, important personal documents stored in closed Scientists are predicting that climate polythene bags and waterproof clothing change will lead to more frequent floods including rubber gloves and boots. Store in the future.Although flooding is a natural the kit in a place safe from floodwater. event that can’t be prevented, you can be GBuy or make sandbags to block patio prepared for it. Follow the advice in this and garden doors and airbricks. booklet to protect the plants and hard landscaping in your garden when floods INSURANCE are forecast, and take action now to Your household insurance policy will reduce further damage if you live in usually cover damage to outbuildings, a flood risk area.After the floods have garages and sheds. It does not generally passed, use our guide to help you return cover storm or flood damage to gates, your garden to its former glory. fences, hedges, garden plants, containers or ornaments unless you have taken out This booklet explains how to cope with an extension to your household policy. unexpected flooding from overflowing rivers or canals, run-off from agricultural or industrial land, and water from the sea or estuaries reaching low-lying coastal areas. Some of the advice in the section on drainage applies equally well to situations where there is groundwater flooding (when an already high water table in poorly draining soil rises above ground level following heavy rainfall). 2 USING SANDBAGS & FLOODBOARDS plywood or metal sheeting outside Keep a stock of unfilled hessian or plastic doors and window frames.Weak or sandbags, sand, a shovel, bricks, blocks of damaged banks and retaining walls can wood, nails and a saw in the shed. In an be shored up with sandbags. emergency, make sandbags from old GGreenhouse doors can also be pillowcases, empty compost bags or protected with floodboards. Even if black plastic sacks.These can be filled you cannot create a complete seal, with sand or earth. the boards will reduce the amount GTwo people are needed to fill sandbags: of floodwater entering the building. one to hold the bag open, one to fill. GAfter the flood has passed, remove Wear gloves when handling sand, as it sandbags and debris piled up against is abrasive.Take care when lifting airbricks in buildings to allow free heavy bags. air circulation. GProtect large areas of sheet glass in patio doors by placing sandbags, POSITIONING USING BOARDS TO SANDBAGS PREVENT FLOODWATER ENTRY TO PROPERTY AND GARDENS Direction of flow Tuck flaps under Board HINGED PANEL SLIDING PANEL ACROSS AN ACROSS AN ENTRANCE ENTRANCE Board Board Sealing compound Frame Frame 3 IF FLOODS ARE IMMINENT IN THE GARDEN GUnplug any exterior electrical connections such as outdoor lighting and pond pumps and filters. Direct- drive pumps can remain submerged in water but bring low-level equipment indoors if possible. GCheck that non-return valves are fitted on outdoor taps.Turn off the water supply to the garden. GWeigh down manhole covers with sandbags or heavy objects. If they lift up during a flood, the drain may be left open which could create a hazard. GMove free-standing items such as pots, dustbins, rotary driers, statues, obelisks, furniture and play equipment to a sheltered location or weigh them down in situ with sandbags. SHED AND GREENHOUSE GMove small containers to higher ground, GMove powered machinery indoors or or onto strong, stable structures such raise it on pallets. as a brick-built barbecue, heavy picnic GEmpty petrol mowers. Keep all table or built-in greenhouse staging. paperwork relating to machinery GTie in climbing plants. filed indoors. GCheck tree ties are secure on newly GLock gardening tools away. planted trees. GRemove any chemicals, fertilisers, GAnchor fruit cages and coldframes pesticides, oils, paints and petrol and against storm damage or dismantle lock them away safely indoors. If left them if time permits.Take up cloches outside, they could be swept into the and bean supports and store them in floodwater and pollute watercourses. a safe place. GClose off the flow valves on gas GTake valuable objects (or those of cylinders in the greenhouse and unplug sentimental value) indoors, or move all electrical equipment. Remove low- them to a higher place in the garden. level electric heaters and grow-lights. Move treasured border plants to raised GCheck that wind braces and anchors beds, plant stands or heavy containers. on the greenhouse are secure and GPeg netting securely over ponds to save close vents and windows. Protect plants and fish from being swept away. greenhouse bases with sandbags. GMove small containers, bags of compost, watering cans etc, onto greenhouse benching. Harvest any crops that can be ripened indoors, such as tomatoes. 4 AFTER A FLOOD Mark the high water level on outside eroded banks or terracing.You may need walls for reference.This will also act as to contact a professional who can assess a reminder when replanting. If you are any structural damage. making an insurance claim, do not throw anything away until you have been told Limit the time spent working in damp, that you may. If in doubt, take photographs wooden buildings, as moulds can worsen or video footage of damaged items. chest complaints.Although the risk of illness is minimal, if you accidentally Water levels may fluctuate for several swallow floodwater and feel unwell, weeks, depending on rainfall and drainage contact your doctor. conditions. Check weather reports and call Floodline on 0845 988 1188 for the latest You may find mice or rats, stray cats or flood warnings.Wait to start repairs until dogs, or homeless wildlife sheltering in you are sure that the floods are over. your garden after a flood. Contact your local authority’s pest control officer or HEALTH AND SAFETY dog warden, the RSPCA, or your local Wear rubber boots and disposable rubber Wildlife Trust if you need help. gloves when working outside, as floodwater may be polluted with oil, ELECTRICITY chemicals, and untreated sewage. Cover Following a flood, turn off the electricity any open wounds with waterproof supply to the garden. Do not use any plasters. If you are not inoculated against appliance that has been affected until it, tetanus, contact your local health centre. and the power supply, have been checked out by a competent electrician. Keep off flooded lawns and borders as far as possible. Keep out of fast-flowing water WASTE COLLECTION or deep still water, and be aware that Flood debris and other waste is classified standing water may contain mud, broken as ‘controlled waste’ as it may contain glass or lumps of debris.Young children, small amounts of chemicals, oil, solvents pregnant women, the elderly and anyone and sewage.