Sure it's possible but you would have to match it up with a screen flow chart.
Generally speaking the flow is directly proportional to the surface area.
If the screen is blocking 10% of the surface area, then it is reducing the flow by that number.
I would think the original screen is in the 5 to 10% area. You would be surprised how little it takes to block flow.
You could probably approximate the blocked area caused by the screen by measuring the thickness of the wire per "box, then count the boxes and multiply it.
Then measure the maximum available area of the pickup without a screen. Then it's a simple proportion.
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