(a) The water conditions upstream and downstream of a dam sitting on a sand layer is...

 

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(a) The water conditions upstream and downstream of a dam sitting on a sand layer is shown on Figure Q-2a. The equipotential lines for the flow conditions are sketched on the figure. 10 m 12 m Water Equipotential Lines 20 m Dam Water 12 m Saturated Sand Impermeable Rock Figure Q-2a Flow under a Dam (1) Sketch, on the enlarged drawing for Figure Q-2a provided separately, a reasonable set of flow lines that are consistent with the equipotential lines shown. [5 marks] Note: You can use a pencil to sketch your flow lines, but please make sure your lines are dark enough to be clear and visible. Remember to write your student number on the enlarged sheet, and tie it to your answer booklet for submission. (ii) Using the completed flow net, calculate the flow rate of water seepage (in m/day per metre run) across the dam. Take the permeability of the sand as 5 x 10 m/s. [5 marks] (111) With the help of your flow net sketch, estimate the pore water pressure at (1) Point A, (2) Point B (at mid-depth of the sand layer), and (3) Point C shown on Figure Q-2a. [6 marks] (a) The water conditions upstream and downstream of a dam sitting on a sand layer is shown on Figure Q-2a. The equipotential lines for the flow conditions are sketched on the figure. 10 m 12 m Water Equipotential Lines 20 m Dam Water 12 m Saturated Sand Impermeable Rock Figure Q-2a Flow under a Dam (1) Sketch, on the enlarged drawing for Figure Q-2a provided separately, a reasonable set of flow lines that are consistent with the equipotential lines shown. [5 marks] Note: You can use a pencil to sketch your flow lines, but please make sure your lines are dark enough to be clear and visible. Remember to write your student number on the enlarged sheet, and tie it to your answer booklet for submission. (ii) Using the completed flow net, calculate the flow rate of water seepage (in m/day per metre run) across the dam. Take the permeability of the sand as 5 x 10 m/s. [5 marks] (111) With the help of your flow net sketch, estimate the pore water pressure at (1) Point A, (2) Point B (at mid-depth of the sand layer), and (3) Point C shown on Figure Q-2a. [6 marks]

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