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<br />I <br /> <br />TABLE VI-I <br /> <br />I <br /> <br />CANYON MOUTH TO 6TH STREET <br /> <br />Alternatives Considered <br /> <br />Remarks <br /> <br />I <br /> <br />Excavate and regrade Eben Fine Park for debris catch <br /> <br />Abandoned due to unknown benefits & adverse impacts to existing vegetation <br /> <br />I <br /> <br />*Possible extension of hike/bike path to Eben Fine Park <br /> <br />*No construction from the canyon mouth to Eben Fine Park <br /> <br />I <br /> <br />Protect and flood-proof Apt. @ 299 Arapahoe <br /> <br />Adverse impact on flood flow <br />Costly <br /> <br />I <br /> <br />*Relocate Apartment Complex @ 299 Arapahoe <br /> <br />Currently within flood plain <br />Improve hydraulic flow characteristics by lowering depth and <br />decrease velocities <br /> <br />I <br /> <br />No alteration in Sunshine Creek area <br /> <br />Reduced disruption to existing vegetation <br />Reduced the opportunity to control flood flow from entering Canyon Blvd. <br /> <br />I <br /> <br />*Excavate north bank in Sunshine Creek area <br /> <br />Provide steel cable debris catchment <br />Control flood flow approaching Justice Center <br />Improve outlet conditions of Sunshine Creek @ Junction with Boulder <br />Creek <br /> <br />I <br /> <br />I <br /> <br />*Excavate floodway adjacent to Justice Center <br /> <br />Provide steel cable debris catchment <br />South bank untouched <br />Low flow channel (100 cfs)/improved existing channel <br />Replant excavated area <br />Earth berm and south side vehicular access to Justice Center <br /> <br />I <br /> <br />I <br /> <br />*Drop structure/scour protection @ 6th St. Bridge <br /> <br />The CAC is primarily concerned that the possibility of overtopping the <br />channel upstream of 6th Street has not been adequately addressed. <br /> <br />I <br /> <br />*Island mounding of north bank to save <br />saved). <br />*Excavation @ <br />*Extension of <br />*Extension of <br /> <br />trees (290 total trees- 275 <br /> <br />Sunshine Creek <br />hike/bike path <br />Eben Fine Park <br /> <br />coordinated <br />to Sunshine <br />eastward to <br /> <br />with proposed park area <br />Creek <br />connect with Sunshine Creek <br /> <br />Wright-McLaughlin Engineers are concerned that the possibility of over- <br />topping or even channel avulsion at 6th Street together with the impacts <br />of floods having a recurrence interval of greater than 100-years have <br />not been adequately evaluated and potentional risks ameliorated. <br /> <br />I <br /> <br />*Selected Alternative <br /> <br />I <br /> <br />*Debris catch <br />Sediment stilling basin <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />44 <br /> <br />I <br />