Groundwater use is of fundamental importance to meet the rapidly
expanding urban, industrial and agricultural water requirements in
(semi) arid areas. Quantifying the current rate of groundwater
recharge and define its variability in space and time are thus
prerequesites for efficient groundwater resource managment in these
regions, where such resources are often the key to economic
development. Attention focuses on recharge of phreatic aquifers,
often the most readily-available and affordable source of water in
(semi) arid regions. These aquifers are also the most susceptible
to contamination, with the recharge rate determining their level of
vulnerability. (Semi) arid zone recharge can be highly variable,
the greater the aridity, the smaller and potentially more variable
the natural flux. Its determination is an iterative process,
involving progressive data collection and resource evaluation;
there is also a need to use more than one technique to verify
results. Direct, localised and indirect recharge mechanisms from a
spectrum of known sources are addressed in the framework of
recharge from precipitation, intermittant flow and permanent water
bodies. The approach taken for each of these reflects the nature
and current understanding of the processes involved. The volume
also reviews current recharge estimation challenges, outlines
recent developments and offers guidance for potential
solutions.
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