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In order to reduce flow beneath the large riprap around the bend , <br /> abed of finer material will be laid in a thickness of 1 . 3 feet <br /> prior to placing the large rock . This finer material will be <br /> durable rock of a D5o of 1 . 0 feet . <br /> D50 R i prap = 3 . 0 ' D5A Filter = 1 . 0 ' D50 Base = 0 . 1 ' <br /> Check : D5, Filterl_ < 40 1 . 0/0 . 1 = 10 O. K . <br /> D5A( Base) <br /> D5 (Riprap) < 40 3. 0/1 . 0 = 3 O. K . <br /> D,A"(Filter ) <br /> From the end of the liner at Station 12+40 , a short steep drop <br /> occurs (see Profile) before the existing culvert under the access <br /> road is reached . This 35 feet long portion is lined with large <br /> r i prap and has a sump dug before the inlet of the culvert . This <br /> section is stable although the inlet may require cleaning every few <br /> years . <br /> 8/�113 <br /> lyq <br />