GEOL 385- Geomorphology Spring, 2007 Laboratory 1: Topographic Maps Instructions: You make work alone or in pairs. Ultimately, each individual must turn in his/her own copy of this assignment for a grade. Please refer to your GEOL 110 lab manuals for a review of topographic maps, if needed. Note: there are 2 different Bridgewater Maps. 1. What is the name of this map? Bridgewater Quadrangle 2. How many minutes of latitude and longitude does this map cover? 7.5 3. Give the coordinates (lat, long) of the center of the map. 38 degrees 26 minutes 15 seconds latitude 78 degrees 56 minutes 15 seconds longitude 4a. What is the latitude and longitude of Mole Hill (in degrees, minutes seconds)? W-38 degrees 27 minutes 25 seconds latitude N- 78 degrees 57 minutes 25 seconds longitude 4b. Using UTM coordinates, what is the latitude and longitude of Mole Hill? W-57,250 latitude N- 78,750 longitude 5. How would the area covered by a 7.5 minute map in Alaska compare to the area of this quadrangle? Why? Same 6. What do the following colors represent? Green Red Black Blue Brown White Purple (if present) 7. What are the contour interval and the index contour interval of this map? Same 8. What year was this map first published? When was it last edited? Either 1964 then revised in 1987 or 1989 with no revisions. 9. What quadrangle is located to the southwest of this map? If the information is not present how would you go about finding it? Briery Branch 10. What is the respective ratio scale of this map? Same 11. What is the verbal scale, or unit equivalents, of this map (x inches on the map = x feet in the real world). Same 12. What geographic direction does Linville Creek flow (upper right quadrant)? Why is it represented in a discontinuous line? South to North- Karst topography; disappearing stream 13. What are two methods that can be used to determine the flow direction of streams? Same 14. What is the maximum possible elevation possible of the hill located approximately at: W - 30 degrees 28 minutes 50 seconds latitude N - 79 degrees 57 minutes and 00 seconds longitude 1699 feet 15. What is the horizontal distance (in miles) between Round Hill and Mole Hill? Approximately 4.5 miles 16. What is the lowest relief of this quadrangle? < 1170 ft. 17. What is the stream gradient of Muddy Creek from where it reaches Mt. Clinton (not that one) to where the Rt. 257 crosses it near the town of Montezuma? 155 ft / 5.5 mi = 28.18 18. Normally rivers are fed by runoff and tributaries; however, this map depicts various rivers in karst topography, where lakes and rivers are fed by disappearing streams. Find three separate instances of disappearing streams that feed aboveground reservoirs, and provide the longitude and latitude for each. 19. What is the magnetic declination of this map? 20. If the magnetic declination is changing at a rate of 5 minutes west per year, what is the projected magnetic declination in 2007? 21. Construct a topographic profile between Round Hill and the intersection of Dry River and Rt. 257. 22. Compare and contrast Dry River and Black’s Run in terms of development and human interaction.