Isohyets-Hurricane Camille

The map above is know as an isohyet map.  Isohyets are lines of equal precipitation.  The image above portrays isohyets from Hurricane Camille in Virginia.  Generally, the heavier lines of precipitation are in the center of a isohyet image, and as you go outward, precipitation decreases.  The above image measures precipitation in inches, and some areas received up to 25 inches of precipitation.http://pubs.usgs.gov/of/1999/ofr-99-0518/ofr-99-0518.html