GrowFAQ: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?| Added by: Cobber Viewed: 175 times | Not Yet Rated | Use the formula pi x radius squared. (3.14 x (2"x2")) = 12.56 square inches for a 4" pipe | | Last modified: 00:22 - Mar 04, 2001 | |
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faq:956 "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?" |
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