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<br />Ms. Ann W. Jamison <br /> <br />-3- <br /> <br />September 19, 1984 <br /> <br />4. The removal of the grade control structure at the <br />wastewater treatment plant cancels the effect of the <br />plant expansion. <br /> <br />5. nost of the structures are oriented parallel to the <br />flow direction which minimizes the obstruction. <br /> <br />6. At several locations, the floodway elevation decreases <br />because a more efficient hydraulic cross section with a <br />corresponding increase In flow_velocity is created. <br /> <br />The floodliay tables for the C.O.E. <br />exl sti ng bull di ngs and the future <br />planned structures modeled are <br />respectively. <br /> <br />run, the C.O.E.-run modified with <br />condition run with all recent or <br />given in Tables 2, 3, and 4 <br /> <br />The spread of the 100-year floodplain is negligible because the <br />fl oodp 1 a I n Is confl ned by the Uni on Pacifi c Rail road embankment and <br />highway embankments and the small rise in floodplain elevations does <br />not cause the embankments to be overtopped. <br /> <br />Please contact us If you have any questions. <br /> <br />Sincerely, <br /> <br />~ c-Jii1 <br /> <br /> <br />Thomas C. Fairley, P. E. <br />Water Resources Engineer <br /> <br />TCF:mn <br />LD84.3/0919TCFl <br /> <br /><, <br /> <br />, <br />