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<br />• <br /> <br />a. Normal metal culvert installation using rprap around the inlet and outlet of culverts. Also use <br />geotextile (filter fabric) or gravel rdter beneath the r prap for most installations. (Adapted from <br />Wisconsin Is Forestry Best,31anagernent Practice far lfiater Quality; 1995) <br />N? <br /> <br /> <br /> <br />14, <br /> <br />• <br />b. Concrete box culvert with concrete wingivalls for inlet/outlet protection and fill retention„ <br />Low-VOLUME Roaos EIMPs_ 81 <br />Geotestile or gravel filter (or both)