Calculate the gradient, or slope, of this portion of the Missouri River by following the steps below:
Step 1: Locate a contour line that crosses the river. Note: An index contour crosses the river in Section 26 (lower left portion of the map). Follow the index contout to the right to establish its elevation.
Elevation: ___________ feet
Step 2: Locate a second index contour that crosses the river. Note: in Section 11, between the letters V and E in the word RIVER. What isits elevation?
Elevation: ____________ feet
Step 3: Use a string and the bar scale to measure the approximate distance (to the nearest mile) between these two index contours.
Distance: ______________ miles
Step 4: Calculate the gradient of the river by using the following formula:
Gradient ___________ feet per mile
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