Laserfiche WebLink
<br />. Page 4 <br /> <br />Because of oscillations in the numeric solution within HEC-6 it was not possible to use a <br />specific time step for dike design purposes. The volume of sedimentation occurring before the <br />peak discharge was found by taking 28% of the calculated total volume. This fraction of the <br />total volume was distributed as an even layer of sediment across the bottom of the Dike <br />channel over the 1,000 foot transition. This procedure facilitated the calculation of <br />sedimentation depth at the peak discharge. <br /> <br />Based on the above results, a new thalweg was determined for each cross-section through the <br />transition, and a HEC-2 file was created to model the flow. The results from this HEC-2 analysis <br />provided a WSEL along the Dike for the peak flow. Finally, the required height of the Dike was <br />found by adding the necessary freeboard to the WSEL. <br /> <br />December 7, 1991 <br /> <br />Conclusion <br /> <br />We feel that this approach is a reasonable method for determining the effects of sedimentation <br />upon our proposed design, Although some simplifying assumptions were made, every effort <br />was made to preserve the integrity of the analysis. <br /> <br />DN-N07-300-10/kmc <br /> <br />. <br /> <br />. <br />