The document outlines a two phase process for flood management: 1) non-structural and 2) structural approaches. Non-structural approaches involve flood risk assessment and planning. Structural approaches involve both large-scale flood defense systems and small-scale, sustainable urban drainage systems to control stormwater runoff. These systems include attenuation tanks, filter strips, permeable surfaces, basins, ponds, and self-closing flood barriers. The goal is to implement both non-structural planning and structural defenses to holistically manage flood risk.

1. Flood Management Systems Two Phase Process: 1. Non – Structural 2. Structural Cork City 2009 Joe Byrne - DT117 March 2010 .

2. Causes of flooding Removal of ecosystems i.e. forestry and wetlands Alteration of the natural environment of rivers Development on flood plains – Poor Planning = Lack of natural resistance to flooding

3. Non - Structural 1990’s the E.U published ‘Best Practices on Flood Prevention, Protection and Mitigation Directive In Ireland Office of Public Works (OPW) was given the responsibility to implement its requirements; Undertake a preliminary flood risk assessment Prepare flood hazard and flood risk maps Establish flood risk management plans. Move away from structural flood defence barriers to a more risk management

4. Flood Maps & Warning System Catchment Flood Risk and Mgt Study (CFRAMS) – Strategy to manage flood risk + Flood Mapping – X-section Thru River – Survey + Maths equation = water levels Warning System – Level sensor warns of high water levels Combination = Flood Mgt Strategy

5. Structural Flood Mgt Systems Sustainable Urban Drainage Systems (SUDS) - strategy for Flood prevention Stormwater Attenuation Tank Filter strips and swales Permeable surfaces and filter drains Basins and ponds Domestic / Commercial flood barrier - Self Closing Flood barrier

6. 1. Stormwater Attenuation Tank Retain water during peak storm levels Hydro Break MH allows 5 litres/sec/acre approx. into watercourse

7. 2. Filter strips and swales Vegetated features which are used to drain water from impermeable areas. Slows rate of water into watercourses

8. 3. Permeable surfaces and filter drains Areas which have a volume of permeable material below ground to store water. Permeable surface can consist of grass, gravel, porous paving etc Slows rate of water into watercourses

9. 4. Basins and Ponds Basin Pond Takes runoff water during storm periods and are free from water during dry weather conditions Contain water during dry periods and are designed to hold more when it rains.

10. Self Closing Flood barrier Dutch design used to protect premises against flooding The flood defence device rises from the ground level up to 1m high and lengths of 100m to 1000m SECTION

11. Conclusion – Sustainable Flood Mgt