This is an isopleth image of a detailed water balance of the upper part of the lower Portneuf River valley. The purpose of an isopleth image is to show features of meteorological charts, connecting points which have an equal value of some variable at a given time and spatial area. This shows the possibilities of future water output over time. It compares what is seen at a particular time to a possibility in the future for that feature. The isopleth uses contour lines to demonstrate the possible water levels over different times.
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