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<br />rr~N ror~ULATION <br /> <br />Areas Currently Undeveloped <br /> <br />1. A natural drainageway would be provided through these <br />areas with a 5-year recurrence interval design discharge. <br />This channel would be designed according to City of Fort <br />collins or Larimer County guidelines for open channels <br />with a minimum of 7S-feet of open space on each side of <br />the channel. <br /> <br />Plan Selection <br /> <br />2. For areas outside of the drainageway from Item 1 above, <br />development guidelines follow those presented under <br />Items 2, 3, 4 and 5 for "Areas of Existing Development". <br />Local streets should follow flood plain flow paths wherever <br />possible and consideration should be given to safely passing <br />these flows across property lines. <br /> <br />Considering Alternatives #1 through #5 for the moment, this analysis <br />shows that Alternatives fl and ~5 are economically feasible for the <br />study reach as a whole. Although benefit:cost ratios of 1.12 and 1.16 <br />are very marginal, other benefits of establishing a total drainageway <br />plan for lOO-year flood protection discussed previously are, in effect, <br />realized although not included in the benefits that have been quantified. <br /> <br />The intent of these regulations is to prevent a large concentration <br />of flows into downstream areas where facilities are not adequate to <br />receive these flows. Also. this plan of flood plain development <br />will serve to ~nsure that flood plain depths and velocities will <br />increase minimally with future development. <br /> <br />Either of these improvement plans, for instance, would remove some <br />700-acres of land from a flood plain area and would eliminate flood <br />plain development regulations that are difficult to manage. These <br />plans also provide for a suitable outlet of drainage flows through <br />the Valley Airpdrk area to the Poudre River. which would greatly reduce <br />legal problems associated with Alternative #6. <br /> <br />immediate corrective measures <br />exist other than to delineate <br /> <br />for flood plain <br />non-conforming <br /> <br />plan to be inplemented <br />This plan provides no <br />problems that already <br />uses that cannot be <br /> <br />only if :'111 <br /> <br />i6, meanwhile, is a non-structural <br />ether alternatives are ruled out. <br /> <br />Alternative <br /> <br />perpetuated but eliminated with time. Also, this approach eliminates <br />probloms in the presently undeveloped areas. <br /> <br />The choice of a recommended plan for improvement is, therefore, <br />between Alternative ~l and Alternative is. Alternative ~S hac the <br />better benefit:cost ratio and provides close to the same deyree of <br />flood protection as Alternative #1. In addition, Alternative #1 has <br />some very real questions related to a channel diversion to Terry Lake. <br /> <br />- 42 - <br /> <br />- 43 - <br />