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BMP C130: Surface Roughening <br />Purpose <br />Surface roughening aids in the establishment of vegetative cover, reduces runoff velo- <br />city, increases infiltration, and provides for sediment trapping through the provision of a <br />rough soil surface. Horizontal depressions are created by operating a tiller or other suit- <br />able equipment on the contour or by leaving slopes in a roughened condition by not fine <br />grading them. <br />Use this BMP in conjunction with other BMPs such as seeding, mulching, or sodding. <br />Conditions for Use <br />. All slopes steeper than 3H:1 V and greater than 5 vertical feet require surface rough- <br />ening to a depth of 2 to 4 inches prior to seeding.. <br />. Areas that will not be stabilized immediately may be roughened to reduce runoff <br />velocity until seeding takes place. <br />. Slopes with a stable rock face do not require roughening. <br />. Slopes where mowing is planned should not be excessively roughened. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11- Chapter 4 - Page 304 <br />