The impact of urban groundwater upon surface water - eTheses ...

GROUNDWATER FLOW TO THE RIVER TAME
An investigation of the groundwater/surface water interaction was undertaken for these
conditions.
5.7 Groundwater and Surface Water Interactions
Continuous monitoring of river stage and adjacent groundwater levels indicated a good
connection between the aquifer and the river. A rapid response of the water table to rises in
river level was recorded in piezometers < 15 m from the riverbank at each of the six sites
investigated (Appendix 12). River level rise due to rainfall events and STW discharges are
seen to produce different responses in the piezometers (P10, P11) located on opposite banks at
Profile 8 (Figure 5.21). The rise in water table occurs when groundwater no longer able to
discharge under conditions of increased river stage enters temporary storage in the bank. The
gradient between the river stage and the water table is seen to fall during the rising limb of the
river flood hydrograph before returning to pre-flood levels, subject to any increase resulting
from recharge to the aquifer. Gradient reversal was not observed in any of the flood events,
for which a maximum stage rise of