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<br />. <br /> <br />. <br /> <br />model. In addition, as required by our contract, the 24th <br />Street bridge (presently under construction) was included in <br />the hydraulic model using construction plans obtained from <br />the City. With the aforementioned changes the COE program <br />was revised to be a current and justifiable hydraulic model. <br /> <br />. <br /> <br />. <br /> <br />Using the revised hydraulic model the la, 50, lOa, and <br />500-year flood profiles were recalculated. The computed <br />water surface elevations for the 10, 50, and lOa-year floods <br />for the entire study reach differed from and therefore, <br />superseded the previous COE results. Since there are major <br />500-year flood diversions at the llth Street bridge,and the <br />COE made a detailed study of the condition, the COE flood <br />elevations were used for that area. <br /> <br />. <br /> <br />. <br /> <br />~ <br /> <br />. <br /> <br />Using the revised profiles the 100 and 500-year flood <br />boundaries were redefined for the entire study reach. This <br />resulted in minor deviations from the previous COE <br />bounderies with the exception of the backwater areas <br />upstream of the 11th, 18th, and 24th Street bridges where <br />more major differences existed <br /> <br />. <br /> <br />. <br /> <br />Please note that our analysis assumed that the levee system <br />located from the railroad bridge to l4th Street would stay <br />in place and not faiL We based this assumption on the <br /> <br />. <br /> <br />-11- <br /> <br />. <br />