13 September 2010
We met with representatives of the EA, and both Oxford City and Oxfordshire County Councils last Friday, 10 September. We were shown the latest results from the computer model of flooding in the Botley Road area, developed by the EA in collaboration with City Council engineers. The effect of various interventions has been investigated.
The model suggests:
1. The existing Bullstake Close barrier, erected by the City Council to protect its properties there, will provide flood protection to properties to the south of the Botley Road at least to a 1 in 25 year flood level (the worst of the floods in recent years, in 2007, was about that level).
2. Creating a road hump at the north end of Earl Street would protect the street from inundation (ie becoming a river) up to the same level. This will be done, by the County Council. The street will have to be closed to traffic throughout the work – the County will be consulting with residents about this. While there will inevitably be temporary inconvenience while the work is done, the benefits in flood risk reduction will be very well worth it.
3. A barrier across the alleyway in Duke Street would give further protection to Duke and Earl Streets, from floodwater coming from the Bulstake Stream behind the houses on the east side of Duke Street. The County hope to do this work, subject to discussions and agreement with the owners of the adjacent houses.
4. Floodwater would still be able to enter the rear of properties on the east of Duke Street direct from Bulstake Stream as it has in the past. – and not only flood those houses but then move on to flood people on the other side of the street and in Earl Street. This could be remedied in various ways – ranging from a permanent earth bank (bund) along the gardens of all the houses backing onto the stream, to individual house measures such as flood doors and airbrick covers, to sandbags. Please note that residents will be fully consulted about the options and that action can and will only be taken if people agree. It seems unlikely that everyone would agree to a garden barrier (and it would have to be in every garden without a break for it to work of course) even though this would give the best protection. Individual house measures on the other hand might a very different matter as they would protect the house itself first and foremost. It is possible (not certain) that money may become available to help householders buy the necessary protection. There’d need to be a community plan for placing protection if people were away or for any other reason unable to do it themselves when flooding threatened.
OFA will be working with the EA and the CIty on this. At last Friday’s meeting we suggested that maybe the EA come to our OFA annual Public Meeting – which will probably be in November – to present the options to residents and get their reactions. This isn’t decided on yet but may well happen.
5. Lowering the highest part of Lamarsh Road would not confer further benefit in a 1 in 25 year or smaller flood. Beyond that it is not clear how much benefit it might provide. The cost of lowering is now said to be £500,000. We are sceptical about that remarkably round sum: it has gone up and down like a yo-yo over the weeks – as low as £200,000 not long ago. OFA believes that there should be further consideration, that we should perhaps talk directly to Kingerlee, and that we should try to ensure that roads are built so as to allow the work to be done later even if it is not done now.