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Outlet Pipe <br />Size <br />100-Year <br />HWL <br />Estimated Cost <br />Existing <br />865.5 <br />N/A <br />15" <br />865.3 <br />$13,098 <br />18" <br />865.0 <br />$18,846 * <br />24" <br />864.3 <br />$32,543 * <br />* The existing pipe being connected t❑ in Germanium Street is a 15" diameter. Installing the 18" and 24" <br />outlets will require the removal and replacement of this pipe to match the size of the pipe being installed. <br />Tables 4 through 6 include the individual costs for this alternative. <br />Alternative 3 <br />In this alternative, the bottom of the low area would be filled to the same elevation as the <br />outlet pipe invert. The pond would then drain dry and would not be sitting with water <br />until it infiltrated. By filling the bottom of th e low area, the resultant 100-year HWL <br />will be 866.2, 0.7 feet higher than the existing HWL. This higher HWL would end up <br />outside the existing drainage and utility easement, creating the need for additional <br />drainage easement. <br />The estimated cost to fill the low area is $15,321. Table 7 includes the individual costs <br />for this alternative. <br />Further research is required to determine if this low area was designed to treat a water <br />quality volume. The volume required would dictate if Alternatives 1 and 2 are viable <br />options. Alternative 3 would not be viable, because the water quality volume is being <br />eliminated in this alternative. <br />