Recharge estimation methodologies employed by the Environment Agency of England and Wales for the purposes of regional groundwater resource modelling
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Published:January 01, 2012
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CiteCitation
S. A. Quinn, D. Liss, D. Johnson, J. J. Van Wonderen, T. Power, 2012. "Recharge estimation methodologies employed by the Environment Agency of England and Wales for the purposes of regional groundwater resource modelling", Groundwater Resources Modelling: A Case Study from the UK, M. G. Shepley, M. I. Whiteman, P. J. Hulme, M. W. Grout
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Abstract
Recharge calculations based on daily soil moisture balance models define the resource available for most regional-scale groundwater models used by the environmental regulator in England and Wales. A switch in recent years from the Penman–Grindley methodology to the Food and Agricultural Organization approach has improved the representation of soil properties in these calculations. A new Meteorological Office algorithm for calculating potential evapotranspiration inputs has also been adopted and rain-gauge data processing on individual models are currently being streamlined towards the use of nationally derived grids. A range of infiltration, bypass and runoff–recharge mechanisms have been conceptualized and modelled incorporating simple representation of unsaturated zone storage and flow processes. This paper reviews the recent changes adopted and considers future challenges.
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Groundwater Resources Modelling: A Case Study from the UK

The UK is a country with over 150 years of widespread exploitation of its principal aquifers for public water supply. Increasing demands, greater awareness of environmental pressures and more exacting legislation has heightened the need for quantitative models to predict the impacts of groundwater use. In the UK this has culminated in a unique national, regulator-led programme for England and Wales to develop conceptual and numerical models of the principal bedrock aquifers.
The outcomes of this programme will be of interest to the international hydrogeological community, particularly as international legislation such as the European Water Framework Directive requires management of water issues across administrative boundaries with a varied cast of stakeholders.
The collection of papers provides a contrast between practitioner- and research-based approaches to assess and predict the anthropogenic impacts and environmental pressures. Many insights are provided on how the regular use of groundwater models may address the environmental challenges of the future.