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6 - Groundwater vulnerability and protection

Published online by Cambridge University Press:  06 December 2010

By
A. P. Butler
Edited by
Howard S. Wheater ,
Simon A. Mathias  and
Xin Li
Howard S. Wheater
Affiliation:
Imperial College of Science, Technology and Medicine, London
Simon A. Mathias
Affiliation:
University of Durham
Xin Li
Affiliation:
Chinese Academy of Sciences, Lanzhou, China
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Summary

INTRODUCTION

Groundwater is a particularly vital resource in arid and semi-arid areas owing to the scarcity of suitable surface-water resources and the high evaporation from surface-water storage. However, if it is also to be a reliable resource, able to meet current and future demand, it has to be managed effectively, not only in terms of quantity (i.e. abstraction) but also quality. Recent decades have seen substantial progress in the development of methods for remediating contaminated groundwater (Reddy,2008). However, because of the complexities associated with the removal and/or destruction of pollutants in the subsurface this is often both costly and time consuming. The maxim ‘prevention is better than cure’ is therefore an important one in groundwater resource management.

One of the key instruments for seeking to maintain good groundwater quality is groundwater protection policy. In most developed countries groundwater protection has been formally incorporated into legislation as a means to ensure good groundwater quality on a sustainable basis and as part of an integrated approach to environmental protection (e.g. EU, 2009). In practice, this is achieved through aquifer vulnerability mapping at the regional scale and source zone protection at the scale of local abstractions. This chapter summarises these two complementary approaches to groundwater protection and considers how they can be implemented in arid and semi-arid regions. This focus on climate is important, as the geological and hydrological conditions are generally very different from those in more temperate regions (Robins et al., 2007).

Type
Chapter
Information
Groundwater Modelling in Arid and Semi-Arid Areas , pp. 75 - 86
Publisher: Cambridge University Press
Print publication year: 2010

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