RVA is the ratio of 3D volume (V) of a watershed to its 2D planimetric area (A). It is found after you have calculated the volume of a basin (see Minimum Eroded Volume or Lake Basin Volume). The index is a means to compare groups of watersheds in different phases of development. RVA is useful in comparing the relative effects of uplift and denudation in a tectonically stable mountain range versus one actively uplifting. Report RVA values to 2 decimal places for each watershed.
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