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<br />10 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />a. Maintaining and existing configuration <br /> <br /> <br />b. A natural type waterway (where feasible) for the <br /> <br /> <br />Creek following the general historic channel of the' <br /> <br /> <br />stream, such historic channel being determined .from <br /> <br /> <br />old aerial photographs, old mapping, and from local <br /> <br /> <br />records. <br /> <br /> <br />c. Selected or limited structure improvements or additions <br /> <br /> <br />(culverts, bridges, irrigation crossing, etc.) and <br /> <br /> <br />channel improvements (real ignment, erosion control, <br /> <br /> <br />low flow protection, maintenance access, velocity <br /> <br /> <br />control, etc,) <br /> <br /> <br />d. The use of lined flood channels in order to reduce <br /> <br /> <br />right-of-way requirements <br /> <br /> <br />e. The installation of major underground conduits along <br /> <br /> <br />the general course of the historic stream channel, <br /> <br /> <br />uSlng local right-of-way whenever possible <br /> <br /> <br />f. Relocating channel to routes other than historic <br /> <br /> <br />channel <br /> <br /> <br />g. Detention and/or retention facilities <br /> <br /> <br />h. Non-structural methods such as advance warnings, <br />evacuation plans, flood proofing, land use regulation <br />and acquisition of flood prone properties with relocation <br />of occupants, <br />4. Screening of Alter~a~ives. Since the total number of alter- <br />natives available will normally reach a large number, the analyst <br />should select the most promising group of alternatives for detailed <br />