What is a watershed?
B
An area draining into a common point
Analysis & Theory
A watershed is a land area where all rainfall drains to a common outlet such as a stream or river.
Which tool is commonly used for watershed delineation?
Analysis & Theory
Topographic maps showing contour lines are used to delineate watershed boundaries.
Watershed boundaries are generally defined by:
Analysis & Theory
Watershed divides or boundaries are typically ridgelines that separate adjacent drainage areas.
The point where water from a watershed drains is called the:
Analysis & Theory
The outlet is the point where runoff exits the watershed.
Which of the following is NOT a physiographic characteristic of a watershed?
Analysis & Theory
pH is a chemical property, not a physiographic characteristic.
The ratio of the area of the watershed to the length of the main stream is known as:
Analysis & Theory
Form factor indicates the shape of the watershed and affects runoff response.
Drainage density is defined as:
A
Total stream length / area of watershed
B
Watershed area / total stream length
D
Number of streams / area
Analysis & Theory
Drainage density is calculated as the total length of all streams per unit area.
Which physiographic factor significantly affects runoff velocity?
Analysis & Theory
Steeper land slopes increase runoff velocity and reduce infiltration time.
The shape of a watershed influences:
Analysis & Theory
A compact watershed produces a higher hydrograph peak than an elongated one.
A fan-shaped watershed will generally produce:
C
Quick runoff and higher peak flow
Analysis & Theory
Fan-shaped watersheds concentrate flow quickly, leading to high peak discharges.
Which map scale is most suitable for small watershed delineation?
Analysis & Theory
A larger scale (1:10,000) provides more detail and is suitable for small watershed studies.
The time required for water to travel from the most distant point to the outlet is called:
Analysis & Theory
Time of concentration is the time it takes for runoff to travel from the farthest point to the watershed outlet.
Which characteristic does NOT affect the time of concentration?
Analysis & Theory
Color of water has no effect on runoff travel time.
Watershed delineation starts from the:
Analysis & Theory
Delineation begins at the outlet and proceeds upstream using contour maps.
Watershed delineation is typically done by tracing:
C
Ridges connecting high points
Analysis & Theory
Watershed boundaries are traced by connecting the highest points around a drainage area.
What is the significance of watershed shape in hydrology?
C
Influences runoff concentration and peak
Analysis & Theory
Watershed shape affects how quickly runoff reaches the outlet and the peak flow rate.
The ratio of the longest dimension of the watershed to its maximum width is:
Analysis & Theory
Elongation ratio provides a measure of how stretched or elongated a watershed is.
Which of the following is useful in understanding flood potential in a watershed?
Analysis & Theory
Hydrographs show runoff behavior and help in flood analysis.
In watershed analysis, the term 'stream order' refers to:
C
Hierarchy of stream segments
Analysis & Theory
Stream order is a way of classifying streams based on the branching pattern.
Which of the following parameters indicates watershed compactness?
Analysis & Theory
Circularity ratio shows how close a watershed is to being circular, affecting runoff timing and concentration.