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<br />. <br /> <br />Woodward.Clyde Consuhants <br /> <br />0997 <br /> <br />. <br /> <br />emergency spillway and other channels if velocities are too <br /> <br />I <br /> <br />high (Ref. 4). Further, we have some concern that erosion of <br />loose material caused by the slaking and weathering of the <br />Pierre shale, as well as erosion of the surficial soils, might <br /> <br />tend to clog the service spillway channel. We recommend that <br /> <br />t <br /> <br />these risks be examined and that appropriate design <br />modifications be made, if applicable. <br /> <br />t <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />- 18 - <br /> <br />. <br /> <br />tIDi. <br />.. <br />