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k I o t z I kF1 I associates <br />potential projects indicates that projects with cost/benefits ratios of $87,500 or less should be <br />considered for construction while those greater than this amount warrant considerable <br />justification. All recommended projects meet this criterion. <br />When project costs are judged to be too high for the benefits obtained, options to consider <br />include 1) no action; 2) citizen evacuation when severe flooding is anticipated, 3) extensive flood <br />proofing of individual buildings; 4) property buy-out and/or building relocation; and 5) reliance <br />upon insurance or emergency relief funds for cost recovery after damage is incurred. <br />Subdivisions where storm sewer system improvements are needed and/or more detailed <br />investigation is needed to determine the extent of needed sewer improvements have been <br />identified and are listed in Table ES-2 in order of estimated drainage problem severity. Of these <br />subdivisions, Brookglen, Creekmont Section 1, Glen Meadows, Fairmont Park East, Pinegrove <br />Valley, and Spencer Highway Estates have high drainage problem severities; and thus should be <br />given high priority for problem solution. The Creekmont Section 2 Project is already nearing <br />construction. Initially proposed improvements have been already identified for Brookglen, <br />Creekmont Section 1, Glen Meadows, Fairmont Park East; these improvements include relief <br />swales as part of the project but will require further engineering investigation for defining full <br />project details. <br />I 1 � <br />Future drainage problems may arise from land development for residential or commercial <br />structures which would, without mitigation, result in increased rates of runoff and possibly <br />overtax drainage facilities. Developers are usually required by the City to provide mitigation of <br />runoff increases. Two approaches are commonly used to provide necessary mitigation: on -site <br />detention or regional detention. The choice between the two is typically dictated by economics. <br />s111111011 <br />only can a detention pond mitigate excess runoff from land development, but it can also provide <br />ES- 5 <br />KIotz Associates Project No. 0127.008.000 La Porte Citywide Drainage Study <br />January 2009 City of La Porte <br />