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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 />14 gal/min/ft~ or 0.031 cfs/ftz <br />3.1 cfs / 0.031 cfs/ft~ = 100 ft~ <br />270 gal/min/ft~ or 0.60 cfs/ftZ <br />Required Surface Area: 3.4 cfs / 0.60 cfs/f t2 = 6 ft2 <br />