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<br />Such piping could be a problem with the soils found on-site. Foundation <br />weep holes will be placed in the stilling basin area to keep excessive <br />hydrostatic uplift pressures from forming. The stop logs will be held <br />in place by removable steel supports. This is necessary because of the great <br />number of large trees which float down the river in this area. By removing <br />the stop logs and supports during the non-irrigation season, these large <br />trees can float over the dam without hanging up on obstructions. An addi- <br />tional benefit of removing the stop logs is that the river can scour out any <br />sand deposits which may have formed during irrigation operations. <br />DESIGN <br />The following items, among others, were considered in the design: <br />1. Ease of maintenance. <br />2. Safety during operation. <br />3. Large floating trees must pass through without problems. <br />4. Provide same water surface elevation as the existing structure. <br />5. Durability. <br />6. Economy of construction. <br />Using this list, along with all the other various hydraulic and structural <br />considerations, resulted in the proposed structure as present in this report. <br />HYDRAULIC DESIGN <br />Flow in the South Platte River was investigated for the past 50 years at <br />the Henderson and Fort Lupton Stations. This investigation showed a maximum <br />flow of 29,600 cfs occurred in 1965 and that the average flow is 346 cfs. <br />The proposed structure is designed to resist the maximum flow and operate during <br />all low or average flows. It should be noted that the maximum flow rate is a <br /> <br />-18- <br />