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currently exists to the next existing manhole at 22nd Ave. In addition to increasing <br /> the system's upstream capacity at 24th and 25th Aves.the pipe would serve as the <br /> trunk line for the 22nd Ave. portion of the proposed bubbler catch basin intercon- <br /> nection project mentioned in item no.4 and detailed in the attached memo. and <br /> maps. <br /> Status: Engineering is currently researching possible design options and easement <br /> acquisalion. <br /> 4. Bubbler Catch Basin Interconnection Project: <br /> Selected areas for proposed bubbler interconnect pilot project. <br /> See attached memorandum. and accompanying maps for details. <br /> 5. Location: W 34th Ave. drainage complex (Note: this will be identified as a <br /> separate project in the CIP) <br /> Nature of Problem: Drainage system originating at City limits along both Sundial <br /> and W 40th Ave reverts between piped and open drainage until finally entering <br /> piped system to the Amazon near W 34th and Olive (S3W1- 5911). A number of <br /> 24 ", 27 ", and 30" diameter pipe segments along the mid section of this system <br /> downstream from larger 33" and 36" pipe segments appear to restrict capacity of <br /> the system to handle additional flows from increased development. <br /> Example: 36" pipe originating at grated manhole behind 384 Delwood <br /> (S4W 1 -5136) reverts to a 24" pipe segment at Delwood (S4W 1 -5134 to <br /> S4W1- 5133), then back to 36" pipe until outletting to open drainage just north <br /> of W 37th Ave. (S4W 1- 5915). It then reenters 24" pipe behind W 35th Pl. <br /> (S4W1- 5922), outlets to open drainage at Frederick (S3W1- 5937), then reenters <br /> 33" pipe west of Olive (S3W 1 -5911) that is shortly restricted to a 27" segment <br /> along W 34th Ave. (S3W1 -5089 to S3W1- 5087). Pipe system alternates <br /> between 30" and 36" segments along E 33rd Ave. until it outlets to the Amazon. <br /> The area cited in the above example, the mid and lower section of this drainage <br /> complex, appears to harbor the potential for creating surcharging and /or localized <br /> flooding conditions at the various diameter restrictions and inlet choke points as <br /> additional flows are introduced to the system from upstream development. <br /> Recommended Solution: Conduct flow analysis of entire system based on the <br /> projected full development of the drainage basin. Study feasibility of reconstructing <br /> sections and /or pipe segments of the existing system that do not meet design stan- <br /> dards necessary to adequately service flows based on full basin development. <br /> Acquire necessary easement from new development to allow maintenance access to <br /> the grated manhole inlet to the piped system behind 384 Delwood St. (S4W1- <br /> 5136). Also, enclose the short section of open drainage to pipe between 36" outlet <br /> oplist.upd 7/95 bne 3 <br />