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