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How do I work out the surface area of one end of a 4-inch storm water pipe I am going to use as my filter housing?
Advanced Techniques
GrowFAQ
GrowFAQ
August 10, 2016, 12:24pm
1
Use the formula pi x radius squared. (3.14 x (2"x2")) = 12.56 square inches for a 4" pipe
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