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

GROUNDWATER FLOW TO THE RIVER TAME
through the channel sides may be considerable due to higher horizontal conductivity
compared to the lower vertical conductivity that dominates flow through the riverbed.
4. The Darcy flow calculations are calculated using data from a period of minimum
baseflow.
5. Perhaps there are narrow zones of high groundwater flow associated with geological
features that focus groundwater discharge and which are not identified by the limited data
coverage.
5.6.2 Radial Flow Estimates
Radial flow estimates were calculated (Section 4.9.3) using river stage and water levels from
nine piezometers located within 15 m of the river bank. Values of discharge ranged from 0.18
to 1.53 m 3 d -1 per metre of channel (Table 5.6, Appendix 18) with an estimated total discharge
to the 7.4 km of channel overlying the aquifer of 5.6 Mld -1 .
Summary of Radial Flow Discharge Calculations
(m 3 d -1 per metre of channel)
Mean 0.76
Median 0.9
max 1.53
95th %ile 1.26
min 0.18
5th %ile 0.26
Table 5.6 Summary of radial flow discharge calculations
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