The Oona Water is a eutrophic river in Co. Tyrone. The gleyed, drumlin soils of low impermeability and soil P concentrations exceeding soil P index 2 provide the source and transport factors necessary for P transfer to the river system. The monitored catchments of 0.15km2, 0.62km2 and 88km2 were 100%, 100% and 95% grassland, respectively and TP exports of 2.4, 2.4 and 3.1kg/ha were measured during 2002. This was a wet year and typical hydrological year exports are likely to be less than this ( kg/ha during the 01/10/2001 to 30/09/2002 hydrological year). As water transfer is extremely efficient owing to good hydrological connectivity in this catchment, controlling the source, i.e. soil P (soil P reserves or inappropriate seasonal fertilising) is recommended as being the primary management recommendation in catchments of similar landuse and permeability. · Particulate P was the largest P fraction and this was associated with suspended sediment concentrations that were also mobilised during storm events.· Dilution of P load was not observed at the larger catchment scale and this was due to high P concentrations (up to 0.26mg TP/L) measured between storms during periods of lower flow. These are mainly in the dissolved form and while a small part of the annual load from the rivers (e.g. to Lough Neagh), they are contributing to the eutrophication of the river systems by chronically enriching the frequent, low flows. The source of these low flow P loads is still speculative and an assessment tool is required to quantify the contributions at low flows (e.g. Nash and Halliwell, 2000; Baker, 2002) in much the same way as P loads to the major lakes in Ireland have been partitioned (McGarrigle et al., 2001; Foy et al., 2003). A working hypothesis on the source of these low flow P loads is from the septic tank effluent via the dense rural population (approximately 0.38/ha).· Despite 76 grab samples (at least 1/week) being taken during the 2002 calendar year at the larger catchment scale, less than 12% were coincidental with storm events. River water quality monitoring on a typically weekly or monthly basis is therefore inadequate and will not provide the necessary data for estimating annual water quality statistics (loads and averages), as these will be biased towards the lower percentile flows. A programme of automatic sampling for river water quality monitoring, especially on flashy rivers such as the Oona Water, is therefore recommended at all scales.

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Jordan, P.   "Identification of refereNce-Status for Irish lake typoloGies using palaeolimnological metHods and Techniques (IN-SIGHT)". Associated datasets and digitial information objects connected to this resource are available at: Secure Archive For Environmental Research Data (SAFER) managed by Environmental Protection Agency Ireland https://eparesearch.epa.ie/safer/resource?id=50bc15f4-42ef-102a-b1da-b128b41032cc (Last Accessed: 2024-10-10)

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SAFER-Data Display URL	https://eparesearch.epa.ie/safer/iso19115/display?isoID=17
Resource Keywords	IN-SIGHT, Reference Status
EPA/ERTDI/STRIVE Project Code	2002-W-LS/7
EPA/ERTDI/STRIVE Project Theme	Water Quality
Resource Availability:	Public-Open
Limitations on the use of this Resource	Usage of the data is available to all users. By downloading and using the data you are accepting the data disclaimer for the data. Please familiarise yourself with this document below. In any publication outputs please cite the original producers and owners of this data correctly using the suggested citation information. Please Note: Given that this metadata documents one workpackage in the INSIGHT project you may be required to cite other project partners when using other data in this project.
Number of Attached Files (Publicly and Openly Available for Download):	7
Project Start Date	Friday 1st February 2002 (01-02-2002)
Earliest Recorded Date within any attached datasets or digital objects	Monday 4th March 2002 (04-03-2002)
Most Recent Recorded Date within any attached datasets or digital objects	Tuesday 31st May 2005 (31-05-2005)
Published on SAFER	Monday 23rd April 2007 (23-04-2007)
Date of Last Edit	Wednesday 25th April 2007 at 11:33:59 (25-04-2007)
Datasets or Files Updated On	Tuesday 24th April 2007 at 10:21:50 (24-04-2007)

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Description of Geographical Characteristics of This Project or Dataset
The Oona catchment (96 km2) is an international RBD shared between the Republic and Northern Ireland. It is located in County Tyrone and forms a small part of the catchment of the River Blackwater, one of the six major influent rivers of Lough Neagh in Northern Ireland. Most of the Oona catchment is situated in the drumlin belt of Northern Ireland.

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The following is a list of projects, datasets, and resources on SAFER-Data from which users downloaded attachments from soon after downloading attachments from this resource Identification of refereNce-Status for Irish lake typoloGies using palaeolimnological metHods and Techniques (IN-SIGHT). You can view the full description for projects, datasets, and resources by using the links supplied.

• Clarianna Rver Catchment - Raw Data Collection View Full Metadata Description
• Phosphorus, Nitrogen and Suspended Sediment loss from Soil to Water from Agricultural Grassland View Full Metadata Description
• Summary of Irish Soil Data from Scoping Study View Full Metadata Description
• Water Framework Directive: Recharge and Groundwater Vulnerability View Full Metadata Description
• MEASUREMENT AND MODELLING OF NUTRIENT DYNAMICS OF TWO ESTUARIES IN IRELAND, WEXFORD AND CORK HARBOURS View Full Metadata Description

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