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DRAFT - FEBRUAPY 9, 1990 <br /> <br />Specify riprap consisting of natural angular stone suitably graded <br />by weight for the anticipated velocities. <br /> <br />Provide riprap to an adequate depth below the channel grade and to <br />a height above the outfall or channel bottom so as to ensure that <br />the riprap will not be undermined by scour or rendered ineffective <br />by displacement. <br /> <br />Specify that riprap be placed over a suitably graded filter <br />material or filter fabric to ensure that soil particles do not <br />migrate through the riprap and reduce its stability. <br /> <br />Require that streambank stabilization and streambed control <br />structures by submitted for review by the Organization. The review <br />will consider the need for the work, the adequacy of design, unique <br />or special site conditions, energy dissipation, the potential for <br />adverse effects, contributing factors, preservation of natural <br />processes, and aesthetics° <br /> <br />Grit Chambers <br /> <br />Grit chambers for presettlement of stormwater must: <br /> <br />Be designed and sized to provide theoretical settlement of a 0.3-mm <br />grit particle in still water at 10G (based on Stoke's Law). <br /> <br />Be designed to provide sufficient storage volume for the settled <br />particles consistent with the maintenance schedule. <br /> <br />o <br /> <br />Include a device to diffuse inflow and provide a relatively uniform <br />distribution of flow over the cross section of the chamber. <br /> <br />2302047/LRRWMO.WP/TMK 8 <br /> <br /> <br />