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<br />k lot z 4~~ ass 0 cia t e s <br /> <br />appropriate to addressing flooding problems. Projects which have higher cost/benefit levels <br />could be considered, but warrant considerable justification. <br /> <br />If then the least expensive proiect of the various options for a particular channel which meet the <br />$87,500 criterion is selected for implementation, the projects listed on the previous page result. <br /> <br />Future Drainage Issues and Regional Detention <br /> <br />Future drainage problems may anse from land development for residential or commercial <br />structures which would, without mitigation, typically result in increased rates of runoff. Such <br />increase in storm water flows could overtax existing or already improved drainage facilities. <br /> <br />Development is typically required by the City to provide mitigation of runoff increases, i.e., <br />construction of facilities that eliminate the increased runoff. Two policy-based approaches are <br />generally considered in providing necessary mitigation: on-site detention (possibly coupled with <br />best management practices which reduce the amount of runoff generated) or regional detention. <br />In practice, a combination of the two approaches is used. Some areas or developments may rely <br />upon on-site detention while other areas or developments may rely upon regional detention. <br /> <br />Regional detention facilities were evaluated for planning purposes. Planning for regional <br />detention requires an identification of potential detention volumes and locations where detention <br />facilities might be located. Under the assumption that regional detention is used, Table ES-3 <br />identifies potential regional detention projects which could mitigate future land development <br />drainage impacts or possibly be used to address yet unidentified current drainage problems. <br />Possible approximate locations for the various detention facilities are shown in Figures ES-I <br />through ES-6. For illustration purposes, pond shape is usually assumed to be square. Actual <br />pond configuration would depend upon site specific details such as property boundaries, site <br />topography, and necessary characteristics of inlet and outlet works. <br /> <br />EN - 13 <br /> <br />Klotz Associates Project No. 0127.008.000 <br />January 2009 <br /> <br />La Porte Citywide Drainage Study <br />City ofLa Porte <br />