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North Gosforth Flood Risk

North Gosforth Flood Risk. Title Slides Your audience needs to know who you are and what you are going to talk about. Give your presentation an opening slide showing the title of your presentation, your name and position or job title.

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North Gosforth Flood Risk

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  1. North Gosforth Flood Risk Title Slides Your audience needs to know who you are and what you are going to talk about. Give your presentation an opening slide showing the title of your presentation, your name and position or job title. Keep it simple. Your audience is far more likely to be distracted at the start of the presentation, when they are still settling down. Job titles should be kept to a single phrase - ‘Managing Director’ or ‘Events Manager’ - and qualifications used only if they are strictly relevant to your audience or presentation. Your closing slide should mirror the opening one, showing the title of the presentation and any contact details, if those are relevant. You can duplicate blank title slides, either by holding down Ctrl and click-dragging into the desired position in Slide Sorter mode (View - Slide Sorter), or by using Insert - New Slide - Title Slide. Ouseburn and Gosforth Letch by Richard Robinson Development Control Team Leader

  2. Content • Review Flood History • Previous Flood Studies • Why did we carry out a new study • Findings of Study • Newcastle Great Park Impacts • Maintenance • Flood Warning • Future

  3. Flood Risk History • Flooding of floodplain is natural and necessary • 2 biggest floods in 1900 / 1903 (rural catchment) • Floods in last 30 years not as severe. • Until 1995 only flood event records - no prediction

  4. Previous Studies of the Ouseburn • Ouseburn Study - May 1995 Posford Duvivier • Only covered the Ouseburn Channel • Ouseburn Flood Risk Mapping Study - May 2002 • Updated Model / Hydrometry • Included the main Letches • Flood Warning Improvements Study - 2004 (draft)

  5. Flood Risk Areas - 1995 study

  6. Flood Risk Mapping Study - 2002 • 172 properties identified in catchment • Approx 50 in Brunton Park / Whitebridge • Approx 15 in South Gosforth

  7. Why did we need another study? • There are over 170 properties at risk of flooding in the catchment • Studies have identified specific flood risk areas • Different flood risk areas may require different flood defence schemes • Current developments in the area (e.g. Newcastle Great Park) may provide opportunities and/or options for flood defence schemes • What can we do?

  8. Scope of the study • Review / update the previous models • Clearly define the nature and extent of flooding problems • Consider potential flood mitigation options • Analyse the feasibility of options • Provide recommendations for future flood management actions

  9. Review of Flood Risk • Causes of past flooding: • Building within the “natural floodplain”: • Increase in the number of properties affected by flooding and the damage caused by flooding. • Reduction of channel capacity and flood storage: • Construction of bridges, culverts, weirs and narrowing of the channel • Increased runoff from heavy rainfall on an increasingly urbanised area: • Leading to increased flood flows

  10. Review / update models • Checked previous models • Models were sound and appropriate • Suggested some features were conservative • Tended to over predict flooding. • Convert models to dynamic, to allow consideration of flood volume. • Considered aspects of NGP.

  11. Flood Risk Areas • Identified 7 flood cells in total - 4 in Gosforth • Brunton Park • Whitebridge Park • Killingworth Road • Glamis Avenue

  12. Brunton Park

  13. Whitebridge

  14. Killingworth Road

  15. Glamis Avenue

  16. Nature and extent of flooding • Using reviewed hydraulic models, site visits and consultation:

  17. Assessing Feasibility • Considers: • What is the flood risk? • How much will it cost? • What are the project risks? • Who will own and who will be the stakeholders? • What impacts will it have on the environment and heritage? • What impact will it have on the community (acceptance)? • What are the health and safety considerations? • How will it impact on traffic? • Maintenance • Rejects: • High capital cost of measure (i.e. no cost-benefit link) • Significant risk of lengthy delay or failure in the implementation process • Overwhelming probability of community or stakeholder rejection • High maintenance costs

  18. Scores DEFRA minimum priority score to attract central government flood protection funding ……..19 Local Levy Funding potential Cost / benefit must be …………..1

  19. Newcastle Great Park • Major Development • With current regulation does not increase flood risk • Provides options to mitigate existing flood risk • All existing attenuation ponds are Outside flood plain • Development draining to Gosforth Letch checked further.

  20. Newcastle Great Park - Ouseburn • All ponds outside of flood zone • Attenuation acceptable • Remodelling of Cell G offers potential to decrease flood risk downstream

  21. Gosforth Letch / Glamis Avenue • Flooding in past caused by blocked culvert • Main flow restrictions are downstream of the Great North Road culvert (Outlet Control) • Culvert trash screen reduces risk of blockage • Flood Risk due to channel capacity

  22. Flow in Gosforth Letch

  23. Recommendations • Better channel maintenance will reduce flood risk on the Letches • Consider property redevelopment to increase standard of flood defences • Ensure NGP works do not compromise current natural flood defences • Work on Glamis Avenue overtopping issue by means of ensuring culvert is not obstructed.

  24. Maintenance Programme • Ouseburn - Routine Maintenance • General Watercourse Clearance (Annual) • Grass Cutting to key areas (Bi-Annually) • Bridge Clearance • Tree Management - Annual • Other one off clearance work carried out if flood risk effected.

  25. Maintenance Programme • Gosforth Letch • General Watercourse Clearance (Annual) • General triming to allow inspection of channel • Strimming works to allow inspection • Clearance of Bridges and Screens (4 per year)

  26. Flood Warning Service : Ouseburn

  27. Current Flood Warning Service

  28. Current Flood Warning Area = NW301 88 at risk, yet 177 on warning service as people not at risk wanted warnings for their gardens even though house wasn’t at risk

  29. Proposed Flood Warning service

  30. What now? • Improve enforcement action following recommendations of the study • Review flood warning service to consider the findings of the study • Continue working with partners to identify alternative solutions and funding streams • Consider partial financing of projects by working in partnership with stakeholders

  31. Questions? Graphics Slides Graphs, tables and photographs can give focus, colour and interest to your presentation - if used sparingly. Do not mix graphics and explanatory text on the same slide - anything which distracts from the main focus, or reduces the space available for the graphic element should be avoided. Generally, photographs should be shown in full screen and any graphs originated within PowerPoint rather than pasted in from elsewhere. In all cases, keep detail to the absolute minimum needed to show a trend or movement. In all slides using graphics, you should make every effort to preserve the dynamic white border at upper, left and lower edges of slide. This version of the slide template, without horizon, should only be used for graphics and not for text. Richard Robinson Team Leader Development Control 0191 203 4150 richard.robinson@environment-agency.gov.uk

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