Question

Question 4: (25 marks) The figure below shows a thin aquifer connecting two irrigation canals 1000 m apart and running parallel to each other. The canal to the left has a water surface elevation of 1007 m while that to the right has a water surface elevation of 1008.5 m. The sand aquifer connecting the two canals has a constant thickness of 1.5 m, bottom elevation of 1000m, porosity of 0.3 and a hydraulic conductivity of 250 m/d. The sand layer is confined from above by a clay layer a) In the figure, sketch the steady state piezometric surface (5 marks) b) What will be the discharge (in m2/day) in the aquifer from one canal to the other? (5 marks). would it take to reach the canal on the left (5 marks)? discharge be (5 marks)? the discharge into the canal on the left be (5 marks)? c) If a contaminant was accidently introduced into the canal on the right, how long d) If instead of a clay aquitard above, the sand continued to the surface, what would the e) In case d), if there was a recharge of 1.5 mm/day to the whole system, what would be Page 5 of7 NOT TO BE TAKEN AWAY UNIVESITY NO El. 1008.5 m El. 1007 m Clay Aquitard 1.5 m Sand Aquifer

Answer 1

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