Isohyets

http://www.google.com.pe/imgres?imgurl=http://www.forest.sabah.gov.my/caims/Climatic%2520information/Stations/Maps/Isohyet/isohyet.gif&imgrefurl=http://mapanalysisnoles949.blogspot.com/2008/06/isohyets.html&usg=__epuFiAgzxPSz83kjvKsRcDki5Kc=&h=580&w=714&sz=81&hl=es&start=2&zoom=1&um=1&itbs=1&tbnid=snpxb9Wsimad3M:&tbnh=114&tbnw=140&prev=/images%3Fq%3DIsohyets%26um%3D1%26hl%3Des%26tbs%3Disch:1
This is an isohyet map that shows the amount of percipitation. An isohyet is a line that connects two places that receive the same amount of rainfall.