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<br />I <br />, I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />East 84th Avenue to 1 nterstate 25 - Plates 111-7 and 111-9 <br /> <br />East 84th Avenue Crossing <br /> <br /> <br />The existing East 84th Avenue bridge is adequate to pass the lOO-year <br /> <br />flood flow without overtopping the roadway; therefore, no modification is <br /> <br />required. <br /> <br />Culvert Immediately North of East 84th Avenue <br /> <br />There is an existing 12 foot by 8 foot CMP arch culvert just north of <br /> <br />East 84th Avenue which carries the Niver Creek under a small commercial devel- <br /> <br />opment to the East 84th Avenue bridge. The discharge capacity of this culvert <br /> <br />is 700 cfs, approximately 165 cfs less than the IO-year flood flow. For the same <br /> <br />reosoning used in discussing the North Valley Shopping Center culve~t, it is <br /> <br />recommended that an additional 12 foot by 8 foot culvert be installed to increase <br /> <br />the total culvert capacity sufficiently to carry the lOO-year flood flow. <br /> <br />Channel Design <br /> <br />The Niver Creek main channel and the Tributary l channel in this reach <br />pass through land that is presently undeveloped but development planning is <br />presently undelWay. Plans coli for construction of single-family residences in <br />the area. <br /> <br />This reach was investigated for both IO-year and 100-year flood flows. <br />The channel can be modified to contain the 100-year flood by widening and diking <br />the low areas. This type of construction is inexpensive; therefore, a moderate <br />expenditure will result in a significant reduction in possible damages. It is recom- <br />mended that this reach of the channel be widened and diked to provide a grass <br />lined channel which can contain the lOO-year flood. <br /> <br />111-8 <br />