CCP 05-10-1999 - Laserfiche WebLink

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I I r I I I I I I II I I I I I I I , I Karth Lake Inlet Problem Stilling basins were installed a few years ago in a ravine on the south end of the lake that enters into Karth Lake, In many cases the stilling basins, constructed of rip rap, are beginning to silt-in and are clogging the culvert outlets, A corrugated metal drop manhole at the end of this drainage system is being washed out as a result of the last stilling basin running over and from runoff from the nearby bituminous pathway. Potential Mitigation Measures * The stilling basins should be cleaned out to ensure that they are functioning properly and that the outlets operate at the proper flow capacity, * Rip rap or vegetation to prevent additional scouring can be used to stabilize the slope around the drop manhole, * Some reconstruction of the structures may be necessary as well, Ingerson Road Problem Ingerson Road has a history of frequent flooding, Because the street is relatively flat and there is no curb and gutter or ditches to direct the runoff, water has a tendency to pond in the street and adjacent yards, Potential Mitigation Measures * Ingerson Road is in poor condition and is a priority candidate for street reconstruction, Ingerson Road would be constructed with an urban pavement section, which would include curb and gutter and storm sewer. * Because Ingerson drains directly into Lake Josephine, a storm water retention pond should be considered for any reconstruction project to improve runoff water quality and control runoff flow rates into Lake Josephine, The existing poor drainage condition of Ingerson Road will be factored into the priority ranking system for reconstruction as a part ofthe comprehensive street condition review scheduled for spring of 1999, The cost table does not include costs for mitigating the Ingerson Road condition as it is assumed that the costs would be borne as a part of a street reconstruction project. Summary Table 1.1 "Identified Drainage Issues" lists the drainage issues identified during the field survey, This table describes the identified problem, its location, maintenance responsibility, maintenance priority and an estimated maintenance cost. Table 1,1 also includes the drainage issues identified above as well as the lesser problem areas around the City, 7