Abstract
Abstract The movements of groundwater and of surface water (in lakes, reservoirs, and rivers) are closely related. When the water level in a river is higher than the water level in the adjacent aquifer and the river bed is permeable, the water will flow from the river to feed the aquifer; falling groundwater levels in the vicinity of a spring can cause it to dry up and the river may disappear in that neighbourhood. When the water level in the aquifer is higher the river takes water away from the aquifer. Figure 1.1.1 from the Thames Water Lower Colne Gravels study illustrates these effects. Natural recharge and stream leakage from the Colne Brook combine to add to the groundwater and the River Thames is draining the water away.
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