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<br />19 <br /> <br />. <br /> <br />basis for calculating project costs and developing a cost <br />allocation schedule. The importance of this initial step is <br />that it allows a community to study the entire jurisdiction <br />in a relatively short period of time and at a reasonable cost. <br />2. Alternative Plan Study -- After the Initial Drainage Study <br />has been completed, the basin will be examined in more detail <br />(at a greater cost and over a longer period of time) to <br />determine other viable drainage and flood control schemes. <br />Each of these schemes will be evaluated in a consistent manner. <br />The viable alternatives developed during this study will be <br />presented in a report for public review and comment. The <br />study will focus on factors other than strict economic ones <br />such as environmental issues and legal constraints. <br />3. Final Plan Study -- The purpose of this study is to prepare <br />the Master Drainage Plan that has been identified as the <br />best drainage scheme for the basin or subbasin during the <br />Alternative Plan Study. This final Master Drainage Plan may <br />be quite different from the plan prepared under the Initial <br />Drainage Study; a difference that may introduce errors into <br />the previously prepared cost allocation schedule. The <br />regulation provides for this through a "Poor Estimate <br />Adjustment" mechanism discussed earlier. <br />It should be realized that development will occur prior to the <br />preparation of the final Master Drainage Plan. The regulation recog- <br />nizes this and allows for divergence from the three-step planning pro- <br />cess. The regulation requires that at a minimum the Initial Drainage <br />Study plan for the applicable basins and subbasins must be completed <br />