e attached topographic map is of an area in northern New Jersey that has just ha

Question

e attached topographic map is of an area in northern New Jersey that has just had a using development built on it. It is your job to determine which areas will be stable under Th new ho what conditions. Step 1: Measure the average spacing of the contour lines (perpendicular to the strike of the contour lines)from different spots on the map. them Area I, Area 2, etc. approximately perpendicular to the contour lines. Measure the length of the line using the Step 2: Divide up the map into separate areas based on average cont our spacing (slope) and label Az Step 3: Determine the average slope angle of each area (1, 2, 3, etc.). First draw a straight line scale on the bottom of the map. Count the contour lines and determine the elevation change along the line. Now draw a triangle Elevation Change Slope Angle ( Measured Distance Where:Tan Tan (Slope Angle) Elevation Change/Measured Distance or ArcTan (Elevation Change/Measured Distance) = Slope Angle Slope 1

Explanation / Answer

For Area 2 the slope is measured by drawing line from the contour value of 980 to 820 and measuring the distance of the line.

Example the line distance = 72,943 feet and the contour difference = 980-820 = 160feet

Slope = 160/72943 = 0.0021 slope

Area 3 = distance of the line = 82218.373 feet AND contour difference = 900-800 = 100 feet

slope = 100/82218.373 = 0.0012

Area 4 = distance of the line drawn = 111312feet ans contour interval = 900-800 = 100 feet

slope = 100/111312 = 0.0008

Area 1 will have slope 0 degrees as the contour interval will be zero.

So to build a house in the area 4 will be more stable because the slope is less than others.

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