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I'm interested in calculating land use percentage for three layers (forest, agriculture and urban) within the context of a water basin area.

I've managed to merge the land use layers with Union tool and then clipped to the area of the basin. But having trouble thinking how to do it.

The result I'm thinking I want is an image showing the area with the three different land use polygon visible and then percentage in the attribute table.

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You can divide the area of the land use features by the area of the basin, then multiply by 100 to derive percent. If the area of your land use features or the basin are not already in the attribute table, you can derive it by creating a new field with a float field type and right clicking this field heading and selecting "Calculate Geometry".

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