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<br />e <br /> <br />e <br /> <br />CHAPTER 5 <br /> <br />Planning And Preliminary <br />Design <br /> <br />5.1 Introductlon- <br /> <br />The best solution for streambank erosion control and for other water resources projects, <br />is typically formulated during the course of a series of studies. Usually a number of <br />alternative solutions will meet the planning objectives to a greater or lesser extent, <br />producing various beneficial and adverse effects, and having a range of costs. To ensure <br />that the "best" solution (least cost, minimum adverse environmental impact, and most <br />acceptable to the public) is identified with minimum expenditure of funds, project <br />planning should be conducted in phases (except under emergency conditions). Each <br />successive phase entails a greater degree of refinement and more detail than prior <br />studies. The required level of study is scaled by the scope of the problem and by <br />available resources. This chapter covers the phase of planning and preliminary design <br />required for streambank erosion projects. Figure 5-1 is a schematic representation of the <br />planning and preliminary design procedure. (Peterson, 1986) <br /> <br />5.2 Site Reconnaissance. <br /> <br />The first step to plantting and analysis of an erosion problem is a reconnaissance of the <br />site. It is a necessary prereqttisite to ensure an understanding of the mechanics and <br />physical processes associated with erosion at the site. In this section, the reasons for and <br />the types of information wbich should be collected during the reconnaissance are <br />discussed. <br /> <br />Colorado Erosion Control Manual <br /> <br />53 <br />