Flood Response Plan West Oxford / New Botley Area
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FLOOD WARNINGS Oxford Area Flood Partnership Environment Agency – Floodline Warnings Direct By phone Register to receive free Flood Warnings by phone, email or fax to landline or mobile numbers for your home and other places. Information for residents, owners and other stakeholders Register online https://www.fws.environment-agency.gov.uk/app/olr/register Flood Response Plan Flood warning The three levels of warning are: West Oxford / New Botley Area Severe Flood Flood Alert Flood Warning Warning Guide No.1 of a series - for Oxford flood risk areas Summary Flooding in West Oxford generally develops slowly, giving time to respond. The Environment Agency (EA) will give the public at least two hours’ notice of Flooding is possible. Flooding is expected. Severe flooding. Be prepared Immediate action required any local main river overtopping its bank (flood alert) or flooding properties Danger to life (flood warning). By monitoring escalating situations, flood response organisa- tions will normally be ready least one day ahead. Once alerted, City Council staff check critical river levels several times a day in order to track the rate of rise and decide whether and when to deploy tem- porary defences. LATEST INFORMATION during a flood Environment Agency Variations in timing, rate, location and total amount of rainfall make each flood Call ‘Floodline’ (24 hrs) on 0345 988 1188 to hear up-to- date local flood different. So, while guided by experience of previous floods, OAFP partners warning and river level information or speak to an operator. liaise closely in order to focus on making best use of available resources and The type talk number for this service is 0845 602 6340. enable response to be based on the developing situation. We aim to imple- ment as much as possible during daylight hours. ‘Live maps’ (updated every 15 mins) https://flood-warning-information.service.gov.uk/warnings Under flood response conditions, the Oxford Area Flood Partners increase the number of staff on standby and monitor flooding in all critical areas. They stay Others in frequent contact with other organisations working in the area, including the Emergency Services. Listen to Radio Oxford Follow the Oxford Mail Flood blog As floods develop, incident coordination centres and local communication cen- Council web pages change to improve links during emergencies: tres are set up which liaise with regional and national centres. This enables a Oxfordshire County Council http://www.oxfordshire.gov.uk comprehensive and rapid response as appropriate to each situation as it Oxford City Council http://www.oxford.gov.uk evolves. Version: Aug 2014 1. (See back page for details of ‘Floodline Warnings Direct’) Response arrangements IS YOUR PROPERTY AT RISK OF FLOODING? EA “Flood Alerts” and ‘Flood Warnings’ prompt City Council staff to monitor Flood Risk maps river levels frequently. The EA internet pages. The EA internet pages show https://flood-warning-information.service.gov.uk/long-term-flood-risk the developing situation for many of the main rivers in Oxford. Once water is over the banks of Bullstake Stream, staff will frequently check 3 day Flood Risk Forecast the rate of progress of the flood across the allotments behind Bullstake Close https://flood-warning-information.service.gov.uk/5-day-flood-risk to decide whether and when to deploy Bullstake Close defences2 (including a mobile 6” pump). The demountable plank wall is installed first. The access Environment Agency flood information https://www.gov.uk/browse/environment-countryside/flooding-extreme-weather track to the allotments is left open as long as possible for use by allotment holders, before closing with sandbags and plastic sheeting. Meanwhile (subject to availability) the EA deploys a mobile 6” pump to Duke St. If water levels rise at Bullstake Close, the access track to the allotments will PLAN HOW TO DEFEND YOUR PROPERTY be closed. The pump will then be used to return the water that passes the defences back to the flood plain. Once Bullstake Close defences are in place, the City Council will maintain 24- For advice on household flood defence hour cover, with a “Bronze” command3 stationed there. Staff will then monitor National Flood Forum flood levels in the area more often. http://nationalfloodforum.org.uk/ Association of British Insurers – As water levels approach Duke St along the footpath from Bulstake Stream, https://www.abi.org.uk/products-and-issues/topics-and-issues/flooding/ the City Council will build a defence from sandbags and plastic sheet across 4 the path (progressively if necessary) up to the level of the adjacent doorstep. LEARN FROM OTHERS Once water reaches the level of the lowest road gully covers in Earl St and Duke St (provided a further rise is expected) the City Council will close the isolation valves5 on the surface water sewers. Your local flood action group 6 Earl St will then be drained by the pumping station below the pavement. Oxford Flood Alliance http://www.oxfordfloodalliance.org.uk/ ———————————- 2. Bullstake Close is the lowest point of the Botley Road connected to the flood plain upstream, so is the first part of the area to be defended. 3. Bronze’ Command is an on-the-spot manager. Bronze / Silver and Gold Com- mands are a hierarchy of temporary communication centres set up in emergencies to control activities over areas of increasing size. REPORT PROBLEMS during a flood 4. For Duke St footpath, a permanent base is proposed for a demountable defence, Oxford City Council 01865 249811 (switchboard) which would be quicker to install and remove than the sandbag wall which has been (or use the report form on the website) used to date. (The proposed Western Conveyance might make this unnecessary.) www.oxford.gov.uk (put ‘Flood’ in search box) 5. The isolation valves in Earl St and Duke St prevent backflow into the low-level gullies when the level in Bulstake Stream prevents flow out from the surface water sewers in Botley Road HOW TO USE SANDBAGS EFFECTIVELY 7 Duke St will continue to be drained by the temporary pump. Sandbags At Osney Court the managers will deploy temporary WCs and walkways Sandbags can’t stop water: They can only slow it down. A plastic sheet larg- when necessary. The boundary walls help to protect the Botley Road. er than the area being covered will be needed to work with the sandbag to As floods rise further at Bullstake Close, the City Council will install make an effective flood barrier. ‘Floodstop’ 8 water-filled units across the entrance to the Bullstake A single sandbag in a bin bag, stamped against an airbrick, would be more Close car park and use smaller pumps to return leakage from there to effective at saving your home from flood than a heap of sandbags. And a the floodplain north of Bullstake Close . few, close-packed against sheet of plastic, can protect a doorway. If water rises yet further at Bullstake Close, there is a risk that the defenc- Moving fewer bags might save your back too! es there would retain water on the flood plain to a level that could enter Sandbags are good for stopping waves from passing traffic, washing Botley Road houses which would not otherwise be affected. The City into your garden or against your house, but will not hold back standing Council will liaise with the EA to determine the appropriate time for pro- water. gressive removal of the sandbag defence to allow flood water across Bot- ley Rd, as occurred in 2007 when there were no defences here.) So if your house is at risk, purpose-made barriers (with airbrick protec- tion if appropriate) and a pump would be a worthwhile investment. ‘Floodstop’ barriers would be installed on the Earl St road hump9 to improve protection there before water was let onto Botley Rd. The Environment Agency provides advice on using plastic with sandbags, and In order to guide flood flows to Lamarsh Road the ‘Floodstop’ barrier at how to lay sandbags if more than one layer is needed: Bullstake Close would be extended across the inbound lane to the https://www.gov.uk/government/publications/sandbags-how-to-use-them-to-prepare-for-a- crown of Botley Road. This still enables emergency vehicles access flood along Botley Road and leaves open a route to Lamarsh Road for any The City Council will establish a temporary distribution point for sandbags on Botley flood flows emerging from Osney Court. Road, the location of which may vary dependent on the areas at risk, and the areas available to set up. Previous locations have included: ———————————- PC World It may also deposit pallets of sandbags at other locations 6. The flood pumping station in Earl St drains the last two road gullies at the south end. However, when the isolation valve is closed, an underground over- flow enables it to drain all gullies in the road. This allows optimum use of the OXFORD AREA FLOOD PARTNERSHIP capacity of the two pumps before the road actually floods. This should help take groundwater flows that leave houses through their airbricks. Oxford Area Flood Partnership (OAFP) formed after the 2003 floods, to help 7. In Duke St, the EA temporary pump sucks from a chamber with direct connec- local organisations better co-ordinate their flood management activities. tion to the surface water sewer. With the isolation valve closed, this makes best The partners are: use of the pump’s capacity if the road floods, and will help take groundwater that Oxford City Council The Environment Agency escapes from houses through airbricks in a smaller flood. Oxfordshire County Council Thames Water Utilities 8. Floodstop barriers are a line of re-usable proprietary plastic units filled with wa- ter that are quicker to deploy than an equivalent sandbag defence.