Conceptual models for Northern Ireland's Cretaceous and Carboniferous aquifers

Northern Ireland’s main limestone aquifers are found in the Carboniferous and Cretaceous sequences. Aquifer conceptual models have been developed for these and the other aquifers in Northern Ireland as a consistent platform from which more detailed conceptual models can be developed for any form of hydrogeological investigation and study. These are based on the most up to date research and data available. The majority of the Carboniferous and Cretaceous limestones are located in upland terrain. Karst systems have developed within them, receiving sinking streams as their main source of recharge. They are predominantly free-flowing and have exploited pre-existing intersecting faults. Transmissivities are moderate to high but storativity is low in these aquifers. This means that episodic high yields are achievable from karst springs and boreholes, but they may not be sustainable as a supply source during drier periods.