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<br />e <br /> <br />e <br /> <br />CHAPTER 6 <br /> <br />Detailed Design and <br />Special Cases <br /> <br />6.1 Introduction- <br /> <br />In civil engineering, detailed design is typically regarded as the most difficult and <br />critical aspect of a projecl. Design of erosion control wodcs is often atypical in this <br />respecl. If you have developed an understanding of the morphological condition of the <br />project reach, determined the cause of the problem, and selected an appropriate solution, <br />you may have a1ready concluded the most difficult aspects of your projecl. <br /> <br />For many erosion control solutions, no hard and fast design guidelines or rules exisl. For <br />others, a long history of use and experience have led to the formulation of various levels <br />of guidance. This chapter presents information about detailed design considerations for <br />many of the solutions discussed in the manual. None are discussed in great detail, and <br />some are not presented because of space limitations. Most of the references cited herein <br />and listed at the end of the manual provide additional design guidance. Most notably <br />USACE (1970), Simons and Li (1982), and Hempbill and Bramley (1989) provide <br />useful information. If work is to be done in the Denver Metropolitan area, Urban <br />Drainage and Flood Control District Guidelines (1990) should be followed. This is also <br />an excellent reference for any geographic area. Projects utilizing proprietary materials <br />as a principal component sbould be designed according 10 the manufacturers' <br />recommendations. <br /> <br />6.2 Armorlng Structures - <br /> <br />As stated in chapter 4 of this manual, the function of an armoring structure is to simply <br />prevent erosion of the underlying material by virtoe of its ability to provide a barrier <br />between erosive currents and the bank. To maintain structural integrity, the armor <br />material must resist the shear induced by the ftow, must resist sliding due to gravity, and <br /> <br />Colorado Erosion Control Manual <br /> <br />67 <br />