The following questions are based on Map T-6 in the back of the Laboratory Manua
ID: 77563 • Letter: T
Question
The following questions are based on Map T-6 in the back of the Laboratory Manual, the “Johnson City, Tennessee-Virginia-Kentucky-North Carolina,†topographic map (scale 1:250,000; contour interval 100 feet).1.
(a) Describe the general topography of the region between Clinch Mountain and Powell Mountain.
(b) What kind of stream drainage pattern has developed here?
(c) How has the road system been influenced by the topography?
2. (a) Describe the general topography in the region north of the Poor Valley Ridge.
(b) What kind of stream drainage pattern has developed here?
(c) How has the road system been influenced by the topography?
Explanation / Answer
a. The region between the Clinch mountain and powell mountain as can be seen in the map is traversed by several eroded parallel valleys.
b. The drainage pattern which has developed in this region is the Trellis pattern. Trellis pattern is the drainage pattern that is developed when the beds of alternating hard and soft lithologies or tilted/ folded strata is found. In this there are nearly parallel strike streams joined at high angles by short dip streams and anti dip streams.
c. The road system has been affected by the trellis pattern and will tend to follow it.
2a. The Poor valley region is a hilly region and there are small structures in the area.
b. the drainage pattern is dendritic. This drainage pattern is developed in the area where there are no marked lithological or structural controls which affect the drainage pattern. This consists of irregular branching tributaries in a tree like pattern with the junctions of tributaries at varied angles but usually below 90 degree.
c. The road system followed the drainage pattern of the area.
3a. The Power river is not flowing across the flat floodplain.
b. Since if it was a flat floodplain the river should homogeneously flow across it. But the river is surrounding the hill which means that the river is not flowing across the flat floodplain.
4. The drainage pattern which develops outside the Okmok Caldera is Radial. In the radial pattern the streams flow outward from the center.
5. The drainage pattern which develops inside the Okmok Caldera is centripetal. In this the stream flow inward to center.
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