Geography mapping lab
You should have drawn your contours with a 1’ contour interval. Using the contours:
- Locate and label all ridge lines and valleys.
- Place on the map all 3 types of scale.
- Where is the maximum gradient on the map? What is the
gradient in percent? Where is the maximum gradient in your
section? What is the gradient?
- Draw cross sections along the line A-A, B-B, and C-C
- Determine the maximum flow that each of the drive lanes can
carry using the equation in the book (pg 276). To determine the velocity, use the equation 𑉠= 74.5 ∗ ( ð‘¤∗ð‘‘)0.66 ∗ √𑆠where S is
the gradient of the driveway.
- If the drives were only half full, what would the velocity be? 1⁄4
full? 3⁄4 full? What can you say about the relationship between
water depth and velocity?
- What do you notice different about the contours in the different
drive lanes?
- What does this tell you about how the water will flow?
- If 1⁄4” of rain falls (i.e., the whole area on your map is covered with
1⁄4” of water), where will the water go?
- How much will go to each area?
- Label the areas of pavement, building, plants.
- What is the average albedo for the whole area? For your
section?
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