Drainage and Flooding Report January 2009

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klutz associates appropriate to addressing flooding problems. Projects which have higher cost/benefit levels could: be considered, but warrant considerable justification. If then the least. expensive iiroect of _the _various otions for a particular channel which meet the problemsFuture drainage •m land development forcommercial typically Development is typically required by the City to provide mitigation of runoff increases, i.e., construction of facilities that eliminate the increased runoff. Two policy -based approaches are generally considered in providing necessary mitigation: on -site detention (possibly coupled with best management practices which reduce the amount of runoff generated) or regional detention. In practice, a combination of the two approaches is used. Some areas or developments may rely upon on -site detention while other areas or developments may rely upon regional detention. Regional detention facilities wire evaluated for planning purposes. Planning for regional detention requires an identification of potential detention volumes and locations where detention facilities might be located. Under the assumption that regional detention is used, Table ES-3 identifies potential regional detention projects which could mitigate future land development drainage impacts or possibly be used to address yet unidentified current drainage problems. Possible approximate locations for the various detention facilities are shown in Figures ES-1 through ES-6. For illustration purposes, pond shape is usually assumed to be square. Actual pond configuration would depend upon site specific details such as property boundaries, site topography, and necessary characteristics of inlet and outlet works. EN-13 Klotz Associates ;Project No. 0127.008.000 La Porte Citywide Drainage Study January 2009 City of La Porte