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I I 6TH STREET TO 9TH STREET Alternatives Considered Rema rks I Lowering Justice Center parking lot Possible acceptance return flow of escaped flood flows No flood conveyance Require extension of rock wall I I *Floodway excavation @ Justice Center parking lot No change to Justice Center parking lot South bank untouched Low flow/improved existing channel Enlarged kids fishing pond Is land mound i ng Enlarge existing berm on Canyon I I El iminate kids fishing pond and deepen channel No significant increase in flood volume conveyance Possible debris catch in fish pond Require taking of trees I *Floodway excavation @ enlarged kids fishing pond South bank excavated @ Gregory Creek and replant area Island mounding Low flow/improved existing channel Enlarged kids fishing pond Rock well adjacent to Canyon Blvd. I I *Earth berm connecting rock wall to 9th Street Bridge *Orop structure/scour protection @ relocated 9th Street Bridge Wright-McLaughl in Engineers believe that the proposed berm in the vicinity of the 9th Street bridge, which is approximately one foo~ higher than the intersection of 9th Street and Canyon Boulevard, IS an "Achi lIes Heel" of Plan II. Wright McLaughl in Engineers are concerned that the possibility of overtopping or even channel avulsion at 9th Street together with the impacts of floods having a recurrence interval greater than 100-years have not been adequately evaluated and potential risks ameliorated. I *Island mounding to save trees in fish pond area - (l35 total trees - 100 saved). *Replanting excavated area *Recreation area adjacent to Gregory Creek *Hike/bike path access to fish pond *Rock wall and plantings I I *Selected alternative I I I I I I 45