Arterial Drainage Scheme Channels

Theme: Society
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Abstract: This data shows Arterial Drainage Scheme (ADS) Channels constructed under the Arterial Drainage Acts 1945 & 1995, that OPW has a statutory obligation to maintain. These channels are either modified watercourses or constructed channels/drains to enhance the conveyance or constructed to modify the flow regime in an area. The average channel is requiring maintenance every four to six years. However, this varies with some channels requiring maintenance annually and others only requiring maintenance every twenty years. Circa 2,000 km of channels are maintained annually and nearly all of the 11,500 km of channels will have been maintained at least once over the Programme cycle of six years. Arterial Drainage Schemes were carried out under the Arterial Drainage Act, 1945 to improve land for agricultural purposes. The Act was amended on a number of occasions, for example to transpose EU Regulations and Directives such as the EIA, SEA, and Habitats Directives and the Aarhus Convention. The Arterial Drainage (Amendment) Act, 1995 further allows for the implementation of localised flood relief schemes to provide flood protection for cities, towns and villages. Statutory Arterial Drainage Maintenance entails the maintenance of completed Arterial Drainage Schemes and completed Flood Relief Schemes. The OPW are responsible for the maintenance of 11,500km of channel, 800km of embankments, some 19,000 bridges and further ancillary structures such as weirs, sluice barrages, sluices, pumping stations and tidal flap gates.

Purpose: This data has been developed to support the maintenance of Arterial Drainage Schemes carried out under the Arterial Drainage Acts 1945 & 1995, that OPW has a statutory obligation to maintain. These schemes were carried out to improve land for agriculture and to mitigate flooding in urban areas.

Data Resources (2)

WMS
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SHAPFILE
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Contact Person Office of Public Works
Contact Person Email floodinfo@opw.ie
Theme Society
Date dataset released 2004-01-01
Date dataset updated 2021-07-01
Update frequency Irregular
Language English
Landing Page https://www.floodinfo.ie/
Geographic coverage National
Spatial Reference Systems (SRS) TM75 / Irish Grid (EPSG:29903)
Spatial Resolution(s) Unknown
Provenance information The original sources for the information displayed in this dataset were the exhibition maps for each Arterial Drainage Scheme constructed under the Arterial Drainage Acts 1945 and 1995. These maps were digitised between 2001-2004 from Ordnance Survey of Ireland 1:10,560 six-inch raster data in Irish Grid. Distortion arises from the historic Cassini map projection used in the original maps. Scale along the central meridian and at right angles to it is accurate, but everywhere else, scale, and therefore mapped objects, are distorted in a north-to-south direction. The amount of distortion on the map increases with distance from the central meridian. In Ireland, the Cassini projection was applied on a county-by-county basis for six-inch mapping, with the central meridian passing through a point near the centre of the county. Therefore, distortion is most evident near county borders, and also in rivers, lakes and streams. Distortion and error inherent in the dataset are amplified during translation and re-projection using Irish Grid and Irish Transverse Mercator. In general, as channel maintenance work proceeds, some errors may be found and these are corrected on an ongoing basis. In 2019 an exercise was carried out to correct directional issues within the dataset to allow for correct automatic chainage generation.
Period of time covered (begin) 1945-01-01

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