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?"