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<br />2 <br /> <br />. <br /> <br />bodies and for limited maintenance of non-DISTRICT financed major drainageway <br />facilities. <br />The development of design standards for major drainageway structures <br />built on fine-grained sandy soils commonly found in Toll Gate Creek, Sand <br />Creek, and Cherry Creek basins was determined by the DISTRICT and City of <br />Aurora, Colorado, to be vital for an orderly maintenance program. Such <br /> <br />standards are also intended to assist with final design and design review <br /> <br />of drainageway facilities on sandy soils. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />1.3 Objective <br />The objective of this report is to prepare design standards for major <br />drainageway facilities located in sandy soils. Since the prediction of the <br />response to channel development is a very complex task, there are a large <br /> <br />number of variables involved in the analysis. A great deal of effort has <br /> <br />been devoted to the development of methodologies for predicting the response <br /> <br />to channel development and an understanding of stable channels formed in <br /> <br /> <br />noncohesive materials of all sizes. The application of methods developed <br /> <br /> <br />for design of stable channel systems requires an understanding of the steady- <br /> <br /> <br />state transport of sand-sized sediments. <br /> <br /> <br />This report presents accurate and efficient methods for evaluating <br /> <br />alluvial channels and provides equations and graphs for designing major <br />drainageway facilities. Because of the complex nature of the response to <br />channel development, applying a design standard without understandjng the <br />characteristics of sand-bed channels may lead to an improper design of major <br />drainageway facilities. This report also includes general descriptions of <br />characteristics of sand-bed channels, design considerations for major drain- <br /> <br />ageway facilities located in sandy soils, and a design standard which provides <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />