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<br />k lot z .~. ass 0 cia t e s <br /> <br />Recommendations for drainage system improvements to address current flooding problems are <br />summarized in Table ES-1 (located at the conclusion of the Executive Summary). Various <br />potential projects are identified by a Project Number. Figures E-1 through ES-6 locate where the <br />improvement projects are proposed. In some cases options for addressing the same drainage <br />problem are provided (e.g., as in the case of Projects 14 and 20 for the Brookglen area). Table <br />ES-1 identifies the improvement, the area it benefits, and the channel or channels for which the <br />improvement is being made. The table provides a basic description of the improvement, its <br />estimated cost, and its benefit in terms of estimated reduction in number of flooded <br />(predominately residential) structures. Information for identification of previously flooded <br />structures included repetitive loss and flooding report data provided by the City. (Flooding <br />reports are detailed in Exhibits 2-6 through 2-11 at the end of the maintext.). The'potential <br />projects are ordered according to their cost/benefit, computed as the ratio of the cost for the <br />improvement divided by the estimated number of structures removed from flooding. This <br />cost/benefit can be used by City leaders as a tool for defining priorities for construction of <br />proposed improvements. <br /> <br />Relief Swales <br /> <br />Among the various improvements proposed, surface storm water relief swales are relatively <br />inexpensive and easily implemented. Relief swales are essentially shallow, wide ditches located <br />to carry ponded water away to larger drainage ditches or channels and are used to improve the <br />storm sewer system drainage. Relief swales are recommended when storm drainage conditions <br />indicate the swale will be effective and construction will be feasible. In the urban areas of La <br />Porte, where land availability of drainage easements is typically limited, swale widths can be <br />kept to a minimum by using concrete swales, as opposed to grass swales. The recommended <br />swales are assumed to be concrete lined swales. <br /> <br />Recommended relief swales with their basic sizes are given in Table ES-1; locations of the <br />proposed relief swales are shown in Figures ES-1 through ES-6. The swales are used to improve <br /> <br />EN-4 <br /> <br />Klotz Associates Project No. 0127.008.000 <br />January 2009 <br /> <br />La Porte Citywide Drainage Study <br />City of La Porte <br />