The differences between a slump, a debris flow, a lahar, an avalanche, a rockslide and a rock fall.

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Chapter 16, Problem 2RQ

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The differences between a slump, a debris flow, a lahar, an avalanche, a rockslide and a rock fall.

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1. Calculate the elevation of the water table at each well location and write the approximate elevation on the line next to each well. Next, use a colored pencil to draw smooth 10-foot contours that show the shape of the water table. (Start with the 1160-foot contour.) Use a pencil of a different color to draw arrows on the map to indicate the direction of the slope of the water table. a. Toward which direction (downward) does the water table slope? b. Referring to the site of the proposed water well, at approximately what depth below the surface should the proposed well intersect the water table? 2. Assume that a dye was put into well A on May 10, 2017, and detected in well B on May 25, 2018. What was the rate of groundwater movement between the two wells, in centimeters per day? (Hint: Convert feet to centimeters.)Velocity:_____________centimeters per day

PART 1 Activity 8.7 Ground Subsidence (Figure 8.7) 1. What is the general relationship between ground subsidence and the level of water in the well? 2. What was the total ground subsidence, and what was the total drop in the level of water in the well during the period shown on the graph?Total ground subsidence: —--feetTotal drop in well level: —-- feet 3. During the period shown on the graph, on aver-age, about how much land subsidence occurred with each 20-foot decrease in the water level in the well: 1 foot, 5 feet, or 10 feet?Subsidence: about—----foot/feet 4. Was the ground subsidence that occurred between 1930 and 1950 less or more than the subsidence that occurred between 1950 and 1970?Ground subsidence from 1930 to 1950 was—----than that from 1950 to 1970. 5. Notice that minimal subsidence occurred from 1935 to 1950. Refer to the well water level during the same period of time and suggest a possible reason for the reduced rate of subsidence. PART 2 Activity 8.8 Examining a…