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• 1 <br />0 <br />� � <br />Drainageway. These methods will be combined to form altemate plans. The <br />reaches should be selected such that the dama,es and improvements have sunilar <br />characteristics within each reach. The enforcement of adequate flbodplain <br />regulations shall be considered a part of each alternate plan. The best altemate <br />plans, as conceptually developed by the ENGINEER, will be presented in an <br />alternative matrix supported schematically on topographic mapping having a <br />scale of 1:�000, or another scale approved by COLTNTY, to the interested <br />parties assembled as a group at a presentation meeting. Following acceptance <br />by COUNTY and LOCAL SPONSORS of the best alternate plans, ENGINEER <br />will proceed with the more detailed evaluation of the best altemate plans as <br />defined in the following sections of this agreement. ENGINEER shall consider <br />the potential environmental impact and stormwater quality problems of the best <br />alternate plans. The alternates considered will include, but not be limited to the <br />following: <br />a. Mainta.ining the e�cisting configuration. <br />b. A na.tural type waten�•ay (where feasible) following the general historic <br />channel determined from old aerial photographs, old mapping, and from <br />local recards, pre I-70 if possible. <br />c. The installation of major underground coYiduits along the general co. :. <br />of the historic stream channel, using local right-of-way requirements. <br />d. The use of flood channels in order to reduce right-of-way requirements. <br />e. Selected or limited structural improvements or additions (culverts, <br />bridges, irrigation crossings, etc.) and channel improvements (re- <br />alignment, erosion control, low flow protection, maintenance access, <br />velocity control, etc.). <br />f. Detention and/or retention facilities including water quality facilities. <br />g. Acquisition of flood prone properties and relocation of occupants. ' <br />h. Non-structural methods such as flash flood warning, flood insurance, <br />evacuation plans, etc. <br />i. Relocating channel to routes other than historic channel. <br />j. Other alternates identified as viable during this project phase. <br />k. Combinaxion of any of the above. <br />2.A.7. Hydraulic calculations shall be made to develop and evaluate the best <br />alternate plans as discussed in 2.A.6. These calculations shall be complete to the <br />