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VIIl-2 connot be sotisfied in ~ll cases, however, 011 were considered during the design ond ~n attempt was m~de to optimize the pl~n. River Flow "'~nagement. The South PI aHe River flow should be managed as a multi-purpose river to optimize the many uses of the river within the confines of Colorado law. (~1e~Hundred Year Design Flood. The lOO-year flood wi 11 be the basi s for all floodplain master planning in the South Platte River corridor. Theone percent cr1terlon means that effects on the lOO-year flood must always be ev~luated as to impact and land use optimization. It dnes ~mean th~t overbdnk flood I ng durl ng the HlO-year flood mu~t be e 11rni nated. Utility Crossinqs. The design and construction of utility crossings, should not cause increased flood hazards or an increase in flood water surface. Existing crossings which already create or contribute to flood or erosion problems will be modified. Bridge Freeboard. should maint~in a of the bridge, or surface elevdtion. All proposed bridges crossing the South Platte River minimum tWll foot freebo~rd between the lowest elevation attaChed util ity pipes, dnd the 100~year flood w~ter Drops and Check Dams. Des I gn of river fl ow ob~truct ions such as drop, dnd check dam~ must cons i der the imp~ct of construct i on on the flood carrying cdpdcity of the channel. ! Erosion and Sedimentation. ~ediment deposition effects Bed ~nd b~nk cutting should be mlnimi<ed. by the river, and related Groundwater. The qu~l ity and quantity of the alluvial natural flOOdplain of the South Platte River should deterioration and diminution. groundwater In the be protected from Acce~s Trai 1. Access to the river Should be ;n,l uded for operational ~nd maintenance purposes, and to afford ready inspection of problem areas. S~ch acce~s trail s shall, where prdcti,al, serve a m~1t i-~se function for hiking and running, biking, and non-motori<ed transportation. Inactive Gr~vel Mines. incre~se flood hazard~ surf~ce ~nd groundwater. Old gravel mines should be made safe so as not to or adversely impact the quality or quantity of Cont i nuous li ne~r BOdt; n9. All darns dnd check ddms ~hould hdve safe bOdt chutes suitab 1 e for the typi ca 1 bo~ter for r i v!'r flows up to 1.500 cfs. Use of th!' river may be r!'~tricted to protect the o~b li c safety whene~~r flows exceed saf!' limits. Act ive Gravel Mines. Mining of gr~vel in the natural floodpl ain of the South Platte River should b!' undertdken in a mdMer so ~s not to increas.. flOOd hHdrds or ddversely imp~ct the qUJlity or qUJ'1tity of surface Jnd groundwater. Aquatic life. Means to protect Jnd enhance flslling Jnddll forms of aquatic life Should be in,luded in plans. Floodplain M~naqem~nt ~ogram. The South Platte River corridor will have a viable fl(}odplJin manageme'1t program throughout its ..ntire 40 mile reach. Emphasis Should be placed upon floodpl~jn ~~n~gement between Sand Creek and BJseline Road (Brighton) Decause the chann!'l is designea tor only the 10- y"!arflood. girds and Terrestrial :.lildlife. Enhancement of a ri_erine environment suitable for birdS dnd terrestridl wildlife should be included in the pl ~ns.