Flood management systems

Flood Management Systems Edward Walsh DT117/4 C06515036 Sonya Daly Table of Contents TOC quot;
1-3quot;
What is Flooding? PAGEREF _Toc257215904 4 Flood Policy in Ireland PAGEREF _Toc257215905 4 Flood Risk Assessment PAGEREF _Toc257215906 5 Flood Risk Management Plans PAGEREF _Toc257215907 6 Sustainable Urban Drainage Systems (SUDS) PAGEREF _Toc257215908 7 References PAGEREF _Toc257215909 10 Table of Figures TOC quot;
Figurequot;
Figure 1: Trends in Precipitation in Ireland PAGEREF _Toc257215888 4 Figure 2: Sources, pathways and receptors of flooding PAGEREF _Toc257215889 6 Figure 3: Swale and Filter Strip PAGEREF _Toc257215890 8 Figure 4: Filter drain and Permeable Surface PAGEREF _Toc257215891 8 Figure 5: Infiltration Basin and Soakway PAGEREF _Toc257215892 9 Figure 6: Detention Pond PAGEREF _Toc257215893 9 What is Flooding? Flooding is a natural process that can occur at any time in any location and in inevitable part of life in Ireland today. They are mainly caused by overflowing of seas and rivers but prolonged and intense rainfall can cause sewer flooding, overland flooding and groundwater flooding. Flooding has become a more frequent event over the last decade in Ireland causing devastation to people’s properties that are at risk. This increase is primarily due the effect of climate change. Climate change will affect the levels of precipitation in Ireland with an increased hydrological cycle. Changes in weather patterns will occur along with the amounts and characteristics of precipitation. Figure SEQ Figure ARABIC 1: Trends in Precipitation in Ireland While we cannot prevent flooding from occurring, we can prepare for it and reduce resulting damage and suffering. It is important that a reduction in these future potential flood risks be achieved by incorporating the assessment of flood risk into the planning phase. Flood Policy in Ireland In September 2008, the Department of Environment, Heritage and Local Government and the Department of Finance with responsibility for the OPW published new planning guidelines on The Planning System and Flood Risk Management. This was aimed at ensuring a more consistent, rigorous and systematic approach to fully incorporate flood risk assessment and management into the planning system. These new guidelines are focused on providing for the wide-ranging consideration of flood risk in regional, development and local area plans as well as assessing planning permission applications in line with the proper principles and sustainable development. They also take account of environmental considerations including the need to manage the inevitable impacts of climate change, biodiversity etc., and the EU Directives on Flooding and the Water Framework Directive which established the concept of river basin management. These guidelines will require the planning system at national, regional and local levels to follow the following requirements:- ,[object Object]

It is of practice to adopt a sequential approach to flood risk management and plan developments away from areas that have been identified as flood prone through flood risk assessment.

Flood risk assessment should be included when making decisions in the planning process. Flood Risk Assessment ,[object Object],Figure 2: Sources, pathways and receptors of flooding The stages of assessment include: ,[object Object]

Scoping Assessment- identify the sources of flooding that will affect the site and scope of the extent of the risk, the potential impacts on the development and the possible mitigation measures.

Appropriate Risk Assessment- assessment of flood risk issues in specific detail and provide appraisal of the potential impact on flooding elsewhere and effectiveness of any propped mitigation measures. Flood Risk Management Plans The aim of Flood Risk Management is to minimise the risks arising from flooding to people, property and the environment. After the assessment phase has been completed, the next stage is to design a flood risk management system. The following actions should be taking into consideration when devising a flood risk management system:- ,[object Object]

Risks should be reduced or eliminated by developing areas with little or no flood risk.

Development should only be granted in areas of flooding risk where there are no alternative, lower risk sites available in the area.

Future effects of climate change and coastal erosion should only be taken into consideration when designing developments in areas of high risk. A precautionary approach should be employed so that future occupants are no subject to unacceptable risks.

Thorough assessments of flood risks should be undertaken before a review of development plans to ensure compliance with the guidelines, to ensure that land is not zoned or developments granted permission before the risk is fully known.

Land which will be required for future sustainable flood risk management should be identified on local area plans to avoid development in these areas.

Flood management systems

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Flood management systems