flood management systems jb
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Flood Management Systems
Two Phase Process:
1. Non – Structural
2. Structural
-
Cork City 2009Joe Byrne - DT117 March 2010
.
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
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;
1. Undertake a preliminary flood risk assessment
2. Prepare flood hazard and flood risk maps
3. Establish flood risk management plans.
Move away from structural flood defence barriers to a more risk management
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
Structural Flood Mgt Systems Sustainable Urban Drainage Systems (SUDS) -
strategy for Flood prevention
1. Stormwater Attenuation Tank
2. Filter strips and swales
3. Permeable surfaces and filter drains
4. Basins and ponds
Domestic / Commercial flood barrier - Self Closing Flood barrier
1. Stormwater Attenuation Tank
• Retain water during peak
storm levels
• Hydro Break MH allows
5 litres/sec/acre approx.
into watercourse
2. Filter strips and swales
Vegetated features which are used to drain water from impermeable areas.
Slows rate of water into watercourses
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
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.
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
Conclusion – Sustainable Flood Mgt
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