1. The symbol for pi. Not all calculators are equipped with such a key. Multiply pi by 0.25. 2. Press the multiply button again and enter the pipe diameter squared. 3. Press the multiply
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Simply measure the L x W and figure in the PITCH and check the average rainfall for the area your in the weather service gives you this information. Here is an article I wrote in
http://wiki.answers.com/Q/How_do_you_calculate_the...

This sort of calculation is really complex. It depends on the area of exposed copper, the temperature differential between the pipe and surrounding air, the orientation of the pipe
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The table should have axises, more like a graph not a table one should have pipe sizes the other should have pressures, where they intersect should be a number. this will be the flow
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