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Engineering · Civil Engineering
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Question 4 (14 points): You are working at a site with two lakes, 1692 m apart, which are connected by an unconfined aquifer. The water elevation in Lake 1 is 504.4 masl (meters above sea level) and the elevation in Lake 2 is 476.2 masl. Seepage meter measurements indicate that groundwater (originally recharged from Lake 1) discharges from the aquifer into Lake 2 at a rate of 289 m/d. The aquifer is estimated to be approximately 510 m wide (perpendicular to the direction of flow) with a saturated vertical thickness of 5.5 m. a) What is the specific discharge through the aquifer? (2 points) b) Calculate the hydraulic conductivity of the aquifer in both m/s and m/d. (4 points) c) Assuming the aquifer is comprised of fine sand with an effective porosity of 0.32, what is the approximate average time for a water particle to travel from Lake 1 to Lake 2? points) (4 d) Now assuming the aquifer is comprised of fractured crystalline rock with an effective porosity of 0.0015, determine the average linear groundwater velocity (in m/d). What is the approximate average travel time from Lake 1 to Lake 2 in this case? (2 points) e) What do the results imply for contaminant travel time in fractured rock aquifers? (2 points)

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