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• 4. Straw Bale Requirements <br />Straw bale Permissivity: <br />Required Surface Area <br />5. Gravel Berm <br />Gravel Berm Permissivity <br />Required Surface Area: <br /> <br />19 gal/min/ftZ or 0.031 cfs/ft~ <br />3.1 cfs / 0.031 cfs/ft~ = 100 ftZ <br />270 gal/min/ftZ or 0.60 cfs/ft~ <br />3.4 cfs / 0.60 cfs/ftZ = 6 ft' <br />• <br />