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2006). g. Brassington, 1991; Preene and Brassington, 2003; Attanayake and Waterman, 2006). Generally, this will be a temporary effect, although in a rapidly expanding urban area many sites may be developed at approximately the same time. , 1988). The complexity of pumping regimes and the lack of detailed records of pumping rates and times make the modelling of flows and solute transport very difficult in this environment. Historical records can sometimes be unearthed, but vital historical data are often permanently lost.

Urban groundwater issues have taken longer to emerge and, as a consequence, the science of urban groundwater is comparatively young. To date, remediation and problem resolution have taken priority over much-needed proactive measures such as aquifer management and groundwater protection. , 2006). 2, these issues relate to the impacts of urbanization on either the quality or quantity of the groundwater resource. 5, such issues pose important challenges in the development of simulation models suited to the urban groundwater environment.

Kung, 1990), with almost no evapotranspiration and possibly only limited natural attenuation (Thomas and Tellam, 2006a). As infiltration in this case will be almost evapotranspiration-free, recharge will show much less variation seasonally than is the case where vegetated surfaces are present. , 1988). g. , 2001) to increase infiltration and reduce the ‘flashiness’ of runoff. Occasionally, but less intentionally, other cover material encourages recharge: an obvious example is the gravel bed often used for railway tracks, or soakaways associated with roads.

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