A piezometer was drilled 200 metres from a saline river. The height of the groundwater (which was non-saline) in the hole was 0.2 metres above the level of the river. (a) Estimate how many years it takes for the water to flow from the hole to the river. Use a porosity of 25 % and a hydraulic conductivity of 20 metres/day. (b) What will happen to the groundwater system if groundwater abstraction results in the water level in the piezometer being 1 m below that of the river? (15 marks)
