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

GROUNDWATER FLOW MODELLING
in Kz for the riverbed sediments to 10 md -1 produced minor river losses of 0.003 m 3 d -1 and
0.0009 m 3 d -1 respectively over a short (40 minute) time period. Losses from the river are
prevented by the rapid response of the aquifer to rises in river stage that occur under
conditions of low Sy.
High specific yield in the gravel greatly reduces the amplitude of the groundwater fluctuations
and decreases the distance from the river at which the influence of flood events may be
observed. An increase in water levels of 11 cm (Figure 6.18) can be seen in response to the
flood peak at a distance of 50 m from the river when gravel Sy = 0.005, but any response is
limited to