Rahan Tully Water Framework Directive Groundwater Monitoring Programme Site Information Tully comprises 2 adjacent boreholes in a pump house; referred to as the Tully wells which in conjunction with the Agall / Hollims Hill sources collectively supply the Rahan Scheme. The Tully boreholes abstract 432 m³/day. August 2011 Offaly
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Rahan Tully
Water Framework Directive
Groundwater Monitoring Programme
Site Information
Tully comprises 2 adjacent boreholes in a pump house; referred to as the Tully wells which in conjunction with the Agall / Hollims Hill sources
collectively supply the Rahan Scheme. The Tully boreholes abstract 432 m³/day.
ImagePath1: Rahan
Tully\IE_SH_G_19_011_a_Sampl
ingTap.jpg
August 2011
Offaly
Final Borehole Depth (m): ---
Site Use: Drinking Water (PWS)
RBD: Shannon IRBD
Northing: 226609
County: Offaly
EU Reporting Code: IE_SH_G_232_19_011
GWB Name: Tullamore
GWB Code: IE_SH_G_232
Drinking Water Code: 2500PUB1016
Site Name: Rahan Tully
Water Quality Monitoring Network:
Hydrometric Area: 25
Ownership: Offaly County Council
Site Comments:
The Tully boreholes contribute to the Rahan Scheme. They are adjacent to each other in a pump house.
Scheme Name: Rahan WSSNumber of Abstraction Points in the Scheme:
5
Scheme Summary:There are two boreholes at Tully. The two Tully boreholes in conjunction with the Agall Spring and two boreholes for Hollimhill collectively supply the Rahan Scheme.
Source Report Available
Y
Source Report Info:GSI report prepared for Tully boreholes and separately for Agall and Hollimshill.
ZOC delineated by the GSI. Both Inner and Outer Source Protection Areas were defined. Available from the groundwater section at GSI.
HYDROGEOLOGY
GEOLOGY
Bedrock: Dinantian Pure Bedded Limestones
Subsoil Permeability:
Moderate
HYDROGEOLOGYVulnerability at Monitoring
site:
HighAquifer
Category: Rkd Flow Regime: Karstified
ZONE OF CONTRIBUTION
Estimated ZOC Size
(km²):
1.15
Recharge Est (mm/yr):
280
HYDROCHEMISTRY
Additional Water
Chemistry Information:
During the monitoring period: The average nitrate concentration was 20 mg/l NO3 and the maximum nitrate concentration was 33 mg/l NO3. The average ammonium concentration was 0.012 mg/l N and the maximum ammonium concentration was 0.076 mg/l N. The average molybdate reductive phosphorus (MRP) concentration was 0.006 mg/l P and the maximum MRP concentration was 0.024 mg/l P. The average chloride concentration was 20.2 mg/l Cl and the maximum chloride concentration was 26 mg/l Cl.