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<br />k lot z 4~. ass 0 cia t e 5 <br /> <br />hydraulic inefficiencies which could cause the required detention for the regional pond to <br />be larger than the sum of the on-site detention. Advantages of regional detention include <br />1) the ability to mitigate for areas where on-site mitigation is not feasible; 2) the increase <br />in developable land on a site; and 3) utilization of economy of scale so that the cost to <br />developer for accessing a pro-rated portion of the regional detention is less costly than <br />development of on-site detention by the development. <br /> <br />Procedures for determining necessary storage volumes for regional detention are <br />discussed in Section 3. When applying these procedures, it is assumed that the mitigation <br />necessary for the entire drainage basin is served by the regional detention pond. (Detailed <br />design for the various developments in a regional drainage area might, and likely would, <br />have a mixture of on-site and regional detention.) Exhibits 4-1, 4-2, and 4-3 shows <br />potential detention sites. The required regional detention can be divided among various <br />sites in view actual detailed sources of runoff and site availability. <br /> <br />4.3.2 Channel Improvements <br /> <br />For future conditions, channel improvements are not proposed as an alternative to on-site <br />or regional detention. Development is presumed to be regulated such that increased <br />runoff does not require additional capacity in channels, unless such capacity increase <br />arises because of conveyance of site runoff to a regional detention pond. Channel <br />improvements for the sole purpose of allowing increased development site runoff without <br />use of detention is an inappropriate allocation of City resources to a single entity. Thus, <br />channel improvement is not considered as alternative (by itself) to address future <br />development for planning purposes. <br /> <br />In addition, to avoid flooding of new structures, the finished floor slab elevation of <br />structures will have to be set at levels which will place the structures above anticipated <br /> <br />4-11 <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 />