Location: Dublin, Ireland
City population: 1,263,035
Project duration: 2010 - ongoing
Project cost: Unknown
Financing source(s): Public local authority's budget

Bioswales for flood protection

Bioswales for flood protection on Glendhu Park and Park Road

Following an extreme flood event on August 9th 2008 in Glendhu Park, eight houses experienced flooding and many more came within inches of being flooded. Two swales were constructed by Dublin City Council to provide surface water storage to ensure that no flooding will recur in a similar 100-year pluvial event. The swales are designed to self-drain back into the existing surface water sewer system following a severe storm event. (Ref. 1).

Urban setting

  • Green areas for water management
    • Swales / filter strips

Key challenges

  • Water management (SDG 6)

Main beneficiaries

  • Citizens or community groups
Project objectives
- Provide protection against extreme flood events (Ref. 1) - Provide proper flood protection in the case of a 60-90 minute thunder storm event (Ref. 2)
Implementation activities
- The works involved the excavation of existing soil to the required level, removal off-site of excavated materials, associated pipe works, and final reinstatement / landscaping. (Ref. 1) - Following a flooding event on 24th October 2011, which was of higher magnitude than the event in August 2008, plans were made to extend the swale in Glendhu park to cater for such an event in the future. (Ref. 2)

Type of initiating organisation

  • Local government / municipality

Management set-up


Participatory approaches/ community involvement

  • Dissemination of information and education
  • Consultation (e.g. workshop, surveys)
Details on the roles of the organisations involved in the project
The project was developed by Dublin City Council and discussed with the residents affected by the flood. Following approval, it was implemented by the Council. (Ref. 1; Ref. 3; Ref. 4)
Project implemented in response to ...
... an EU policy or strategy? Unknown
... a national policy or strategy? Unknown
... a local policy or strategy? Yes
Expected impacts
  • Water management (SDG 6)
Details on impacts and indicators used During a flooding event on 24th October 2011, the two swales at Glendhu Park and Park Road appeared to have operated well for the 60-90 minute thunder storm event they had been designed for. However, that flooding event was of much longer duration than 60-90 minutes. 6 dwellings on Glendhu park were flooded to a low level compared to 8 in August 2008 to a deeper level, even though the October 2011 flooding event was of higher magnitude. (Ref. 2)

Presence of formal monitoring system


Presence of indicators used in reporting


Presence of monitoring/ evaluation reports

Availability of a web-based monitoring tool



Disclaimer: The data collection was carried out between June and August 2017, the information presented has not been updated afterwards.