LARC 160 Combined Exam Questions with 100% Correct Answers

What is a floodplain? Correct Answer an area of land that is prone to flooding. usually is a flat area, adjacent to a river, with areas of higher elevation on both sides. We often describe these in terms of 100 year storms; the 100-year fp is the baseline for developmental planning. How can floods assist an area? Correct Answer cause nutrients and sediments to deposit into the soil to fertilize vegetations around the stream/river. What is a contour? Correct Answer is an imaginary line that joins points of equal elevation (height) above a given level, such as mean sea level. The contour interval is the elevation difference between adjacent contour lines. The contour interval should be the same over a single map. The map should also provide a starting and ending altitude for the contours, helping to differentiate between uphill and downhill. There are several rules to note when interpreting terrain contour lines: The rule of V's Correct Answer usually are in stream valleys, with the drainage channel passing through the point of the blanl, with the blank pointing upstream. This is a consequence of erosion. The rule of O's Correct Answer close contours indicate a steep slope; distant contours a shallow slope. Two or more contour lines merging indicates a cliff. By counting the number of contours that cross a segment of a stream, you can approximate the stream gradient. What does a dashed contour line represent Correct Answer Sometimes intermediate contours are present in flatter areas; these can be dashed or dotted lines at half the noted contour interval. Dashed → existing contours Solid → proposed contours What is a gradient? Correct Answer this of a physical feature, landform or constructed line refers to the tangent of the angle of that surface to the horizontal. A larger number indicates higher or steeper degree of "tilt". What is the minimum slope for good drainage? Correct Answer Two Percent for turf, one percent for hard surfaces (e.g. asphalt and concrete) Can a section cut have a different vertical and horizontal scale? Why or why not? Correct Answer No. That would be really inconsistent and would almost certainly confuse anyone looking at the section cut. Also, sections are analytical orthogonal