Isohyets are both similar to Isobars and Isotachs. Isohyeths connect equal points of percipitation. The map above shows the monthly rainfall in Taranaki. Each bar is an increase in 100 mm. Isohyets are another type of map showing something over a certain period of time. The Isohyet maps are comonly done yearly and also daily. http://www.scoop.co.nz/stories/AK0808/S00090.htm
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