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3 of 23 - Terry Street N. and Cone Avenue - Transition from piped to open drainage o PWM Contact: Gene Shutt o PWE Contact: Therese Walch Current Problem: Area where the Cone street piped system empties to an open ditch on the west side of N. Terry. Capacity of the existing open drainage system which runs northwesterly toward Royal Ave. is inadequate due to increasing development which drains to this system. This is open drainage to which the city has no easement or right -of -way. • Recommended Solution: Study the inadequacies of the system. Identify portions of the system requiring upgrading or upsizing. Acquire easements or rights -of -way where needed. Review the possibility of draining this system either south to the A -3 channel or north to Royal via a piped system. • Status: New to the CIP List. • Date identified as a CIP: (Nov. `98) 4 of 23 - Laurel Hill Valley - Riverview /Augusta System o PWM Contact: Fred McVey o PWE Contact: Therese Walch Current Problem: Capacity problems in various areas both in the piped and open portions of the system, primarily in areas of transition from one to the other. Inability of system to handle increased runoff during major storm events. There are also areas of open drainage to which the city has no easement or right -of -way. • Recommended Solution: Study the inadequacies of the system. Identify portions of the system requiring upgrading or upsizing. • Status: New to the CIP List. Portions of the system are on the 1995 Open Waterway Aquisition List. • Date identified as a CIP: (July `98) 5 of 23 - Garfield to Cleveland Drainage System - East of City View, south of 18th o PWM Contact: Brian Elliott o PWE Contact: Peggy Keppler Current Problem : Recently constructed drainage system originating on Morning View Lp. above Garfield St. cul -de -sac outlets to a natural creek bed behind property at 2525 Garfield St. ( #66017). This creek flows across the undeveloped right -of -way of W 25th Ave. and through several developed residential lots that have incorporated it as an integral part of their landscaping. The creek finally inlets back to the piped system near the intersection of Cleveland St. and W 24th Ave. at ( #52575). During heavy storms, additional flow introduced to the creek from this upstream development causes erosion to the creek banks along the developed residential lots. Property owners along Cleveland St. near the inlet at W 24th Ave. are concerned that continued upstream development, especially any improvement of W 25th Ave. and the associated residential construction, will further overload the creek's capacity and wash out what is an important amenity to their property. • Recommended Solution: Conduct flow analysis of existing 10" piped system along Cleveland St. south of W 24th Ave. that roughly parallels the creek to determine capacity for additional flow. Determine the feasibility of connecting any new storm facilities associated with future improvement of W 25th Ave. to the Cleveland St. system in order to bypass the section of creek that runs through the residential lots. This may require upsizing the existing 10" pipe system along Cleveland St. between W 25th and W 24th Aves. up to the next existing manhole north of 24th. Property owners have already reported this system to surcharge through the manholes during heavy storms. From the existing manhole north of 24th Ave. a pipe (possibly 24 ") should be installed continuing north up Cleveland St. where no pipe currently exists to the next existing manhole at 22nd Ave.