The isohyetal method is used to estimate the mean precipitation across an area by drawing lines of equal precipitation. ... Isohyets are contours of equal precipitation analogous to contour lines on a topographic map.

How do you find the mean of precipitation?

Add together all of the monthly rainfall totals in your sample data. You'll be adding measurements in inches because rainfall is generally measured in inches in the United States. Divide by the number of years in your data set to arrive at the average monthly rainfall for any location.

What is the meaning of ISO Heights?

An isoheight or isohypse is a line of constant geopotential height on a constant pressure surface chart. Isohypse and isoheight are simply known as lines showing equal pressure on a map.