Strategic Flood Risk Assessment for the Draft Cork City Development Plan 2022-2028
Flood Risk Assessments Paragraph No. 11.258
The Council will have regard to the Planning System and Flood Risk Management Guidelines for Local Authorities (DEHLG and OPW 2009) when assessing planning applications. All significant proposals for development identified as being vulnerable to flooding will be required to provide a site-specific Flood Risk Assessment (FRA) in accordance with the Guidelines. A detailed site-specific FRA should quantify the risks, the effects of selected mitigation and the management of any residual risks. Paragraph No. 11.259 Assessments shall consider and provide information on the implications of climate change with regard to flood risk in relevant locations. The 2009 OPW Draft Guidance on Assessment of Potential Future Scenarios for Flood Risk Management (or any superseding document) and available information from the CFRAM Studies shall be consulted to this effect. Paragraph No. 11.260 In Flood Zone C, where the probability of flooding is low (less than 0.1%, Flood Zone C), site- specific Flood Risk Assessment may be required and the developer should satisfy themselves that the probability of flooding is appropriate to the development being proposed. This Development Plan’s SFRA datasets and the most up to date CFRAM Programme mapping should be consulted by prospective applicants for developments in this regard and will be made available to Development Management processes in the Council. Paragraph No. 11.261 Further details are also included in Chapter 9 Environmental Infrastructure and Management. Paragraph No. 11.262 Applications for vulnerable development in flood risk zones, including within Flood Zones A and B in the City Centre and the Dockland areas and in areas at risk under the OPW’s Mid-Range Future Scenario, shall provide details of structural and non-structural risk management measures to include, but not be limited to specifications of the following: (1) Floor Levels In areas of limited flood depth, the specification of the threshold and floor levels of new structures shall be raised above expected flood levels to reduce the risk of flood losses to a building, by raising floor heights within the building structure using a suspended floor arrangement or raised internal concrete platforms. When designing an extension or modification to an existing building, an appropriate flood risk reduction measure shall be specified to ensure the threshold levels into the building are above the design flood level. However, care must also be taken to ensure access for all is provided in compliance with Part M of the Building Regulations. Where threshold levels cannot be raised to the street for streetscape, conservation or other reasons, the design shall specify a mixing of uses vertically in buildings - with less vulnerable uses located at ground floor level, along with other measures for dealing with residual flood risk. (2) Internal Layout Internal layout shall be designed and specified to reduce the impact of flooding (e.g. living accommodation, essential services, storage space for provisions and equipment shall be designed to be located above the predicted flood level). In addition, designs and specifications shall ensure that, wherever reasonably practicable, the siting of living accommodation (particularly sleeping areas) shall be above flood level. With the exception of single storey extensions to existing properties, new single storey accommodation shall not be deemed appropriate where predicted flood levels are above design floor levels. In all cases, specifications for safe access, refuge and evacuation shall be incorporated into the design of the development. (3) Flood-Resistant Construction Developments in flood vulnerable zones should specify the use of flood-resistant construction aimed at preventing water from entering buildings - to mitigate the damage floodwater caused to buildings. Developments should specify the use of flood resistant construction prepared using specialist technical input to the design and specification of the external building envelope – with measures to resist hydrostatic pressure (commonly referred to as “tanking”) specified for the outside of the building fabric. The design of the flood resistant construction shall specify the need to protect the main entry points for floodwater into buildings - including doors and windows (including gaps in sealant around frames), vents, air-bricks and gaps around conduits or pipes passing through external building fabric. The design of the flood resistant construction should also specify the need to protect against flood water entry through sanitary appliances as a result of backflow through the drainage system.
CAAS for Cork City Council
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