Published on 9 January 2018
Last updated on 24 March 2022
- Restrictions on the Construction or Alteration of Bridges and Culverts
- Modification or Relocation of Watercourse, Embankment or Other Works
- Restrictions on the Erection/Alteration of Weirs
- Further Information and Forms
The OPW seeks to maintain the existing conveyance and storage capacities of channels and floodplains. The design and construction of bridges and culverts should be such that flood risks up- and / or down-stream are not increased, or, where no other viable options exist, are restricted to acceptable levels, and should comply with any flood risk management objectives and plans established for the area.
Restrictions on the Construction or Alteration of Bridges and Culverts
Section 50: Arterial Drainage Act, 1945 The consent of the Commissioners is required by bodies and persons proposing to carry out construction/alteration works on bridges and culverts.
Modification or Relocation of Watercourse, Embankment or Other Works
Section 9: Arterial Drainage Amendment Act, 1995 The Commissioners may consent to alterations to existing watercourses or structures in Drainage Schemes if the proposed works would not increase the risk of flooding or have a negative impact on drainage of land. This section applies to regrading or relocation of watercourses, replacement or relocation of embankments and various other works on Drainage Schemes. Applications under this section are dealt with on a case by case basis, and applications should be addressed to the appropriate OPW regional office.
Restrictions on the Erection/Alteration of Weirs
Section 47: Arterial Drainage Act, 1945 Any person planning to erect or alter a weir must first get consent from the Commissioners or all the affected landowners. The Commissioners may grant consent only where the applicant meets stringent requirements. The ESB is exempt from this requirement as a separate statutory process is in place.
Further Information and Forms
- Examples of Applications
- Reference Information and Technical Guidance Material for Applicants
- Hydrometric and Hydrological Data
- Reported Flood Event Data on FloodInfo.ie
Section 50 brochure
Section 50 Application Form – PDF
Section 50 Application Form – Word
Under the AIE Regs to request copies of
1) all Section 50s granted
2) all Section 50s refused
3) all Section 9s granted
4) all Section 9s refused
5) all Section 47s granted
6) all Section 47s refused
Please include the initial Application Form AND the OPW documents granting/ refusing the consent
For the purposes if this AIE, please consider the years 2021, 2022 and 2023 to date
For the purposes of this AIE, active disclosure via publication of consents on gov.ie or similar will suffice