10-13-08 Drainage and Flooding Committee minutes

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k lot z 4~. ass 0 C I ate s SECTION 5 COST AND IMPLEMENTATION A key factor in implementing potential drainage remedies is the cost for construction of the project envisioned by the proposed remedy; estimated costs are presented below. Other factors, however, are important to the implementation and continued effectiveness of various drainage improvements; these are also discussed below. 5.1 Recommended Drainage Improvements - 5.1.1 Costs of Feasible Remedies Realistically feasible potential drainage improvements for addressing the underlying cause of the identified drainage problems were identified in preceding sections of this CWDS. Approximate construction costs for implementing these problems were estimated using the unit cost data of Table 5-1; these data are revisions to data developed in Letter Report No.3. Table 5-2 summarIzes for FEMA-modeled channels the estimated costs of potential channel capacity and diversions to address current drainage and flooding problems and regional detention remedies to address future development issues. Table 5-3 provides costs for the non-FEMA channels. Non-channel solutions, i.e. relief sheet flow swales, are presented in Table 5-4 for various subdivisions in the City. It should be noted relief swales were not considered for a number of subdivisions in the City since these subdivisions are located too far away from the receiving stream to be an optimal solution. It has been noted in prior discussion that channel improvements included in some instances channel lining when widening of a grass lined channel within estimated available right-of-way was not sufficient to provided necessary channel capacity. The 5-1 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City ofLa Porte