Question

For a large catchment, contours joining points of equal monthly rainfall values were plotted.
The plot is known as:

• A. Isohyetal map
• B. Mass curve
• C. Isobar map
• D. Thiessen polygon

Answer 1

The correct option is A Isohyetal map

• Isohyetal is a line joining points of equal rainfall magnitude.
• Mass curve of rainfall is a plot of accumulated precipitation against time.
• Isobar map is the plot of line marking places of equal barometric pressure.
• Theissen polygon is the area of catchment bounded by perpendicular bisector of line joining raingauge and catchment boundary.