Groundwater

Question 1

Factors controlling groundwater velocity?

Answer 1

1. hydraulic gradient
2. hydraulic conductivity

Question 2

When is hydraulic gradient zero or negative?

Answer 2

zero = flat water table
positive = low to high hh. artificial or localised conditions (recharge, geological conditions)
negative = high to low hh. cone of depression

Question 3

interactions of groundwater and surface water

Answer 3

1. baseflow = aquifer discharge into rivers
2. recharge = surface water into aquifer