You have a road that is 50 feet wide, the elevation at the center line is 26.20 feet, given a 2% slope, what is the elevation at the edge of the road?

To determine the elevation at the edge of the road, starting from the center line elevation and considering the slope, we first need to calculate the change in elevation across the width of the road.

The road width is given as 50 feet, and if the center line elevation is 26.20 feet with a 2% slope, we can calculate the drop in elevation from the center to the edge of the road. A 2% slope means that for every 100 horizontal units (feet), the vertical change is 2 feet.

Since the road is 50 feet wide, we find the vertical drop using the slope percentage:

• Change in elevation = Width of road × Slope = 50 feet × 0.02 = 1 foot.

Next, to find the elevation at the edge, we need to subtract the drop in elevation from the center line elevation:

• Elevation at the edge = Center line elevation - Change in elevation = 26.20 feet - 1 foot = 25.20 feet.

However, it seems that there's a slight mismatch with the answer provided and the calculations used. The correct context in understanding the answer 'B' being labeled as 25.70 feet can be attributed to