capture sediment while allowing water seepage, and it is useful for comparison of products. As discussed above, since the effectiveness of SRDs can also be installation dependent, this test method may not be completely indicative of product performance. ASTM D5141 apparatus and procedures The test apparatus used in ASTM D5141 can accommodate a vertical SRD, such as a silt fence or wattle, or a horizontal SRD, such as an inlet filter. The full test apparatus is shown in Figure 2. After positioning the SRD and ensuring that it is sealed around the edges, sediment-laden runoff is created FIGURE 2 ASTM D5141 test setup www.GeosyntheticsMagazine.com 23http://www.naue.com http://www.GeosyntheticsMagazine.com