take as it traveled through the ground in the groundwater xB XD 105 85 110 90 10
ID: 287905 • Letter: T
Question
take as it traveled through the ground in the groundwater xB XD 105 85 110 90 100 110 120 L 130 ^ 0 XA 150 115 130 120 130 Stream Figure 13.11 Groundwater and Contamination Flow Which of the Lakes (85 or 105) or locations (xA, xB, xC, xD, or xE) would become contaminated? a. b. Would this toxic waste contaminate the part of the stream shown on the map? 16. Groundwater flows much more slowly than streams. If the speed of groundwater flow in the area shown by Figure 13.11 is 2 m/day (a fairly high flow rate for groundwater) and the distance from Lake 105 to B is 0.5 km, how long would it take for contaminated water to reach a well at B? Assume that the contamination travels at the same speed as the water. Write out your calculations.Explanation / Answer
a. Answer: Lake 105 would become contaminated as some groundwater contour is above topographic contour. When groundwater contour is above topographic contour, contamination will happen. A, B, C, D, E all are non-contaminate as topography is above groundwater.
b. Answer: Stream will not get contaminated as the topographic contour is always above groundwater contour.
16. Speed, hydraulic conductivity= 2 m/d
Heap difference between two points = 118-105 = 13 m, distance = 0.5 km =500 m
Gradient i = 13/500
Rate = k. i = 2 * 13/500 = 0.052 m/d
Therefore, 500 m travelling, time taken = 500 / 0.052 = 9615.38 days (Ans:)
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