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Using inroads to calculate volume

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I'm pretty sure I've done this before and I simply cannot remember the sequence of doing so.  I have a base topo and am overlaying a final fill plan.  Wanting to calculate the remaining fill, normally I'll calculate the area of each  5' contour in sq.ft using a planimeter.  I take average between each contour and get a cu.ft. then cu.yd. if needed. 

 

Can't this be done in InRoads by importing these shape surfaces for each contour?  What are the steps?  I am drawing a blank...or I'm mistaken and I've not done this in InRoads.

 

Thx for your help. 


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