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<br />k lot z 4~. ass 0 cia t e s <br /> <br />manual should be, for the purpose of preventing the development of future drainage <br />problems, rigorously and consistently enforced by the City. <br /> <br />5.2.8 Issues in Regional Pond Development for Future Development <br /> <br />Regional detention pond development has been proposed as a pnmary strategy for <br />addressing impacts of future development. Regional detention is one component of a two <br />prong strategy: On-site detention versus regional detention. If carefully designed and <br />implemented, either method, or a combination of both, can effectively address potential <br />future drainage impacts arising from development or redevelopment. <br /> <br />Several factors affect, however, which may make regional detention less attractive than <br />on-site mitigation: I) The runoff from an upstream development site must get to the <br />regional detention site; if the runoff is to reach the detention site, then the channel <br />conveying the site runoff must be sufficiently large that the increased runoff from the site <br />does not exceed channel capacity; and 2) off-site detention has hydraulic inefficiencies <br />which would typically cause the required detention for the regional pond to be larger than <br />the sum of the on-site detention. <br /> <br />On the other hand, the advantages of regional detention include 1) the ability to mitigate <br />for areas where on-site mitigation is not feasible; 2) increase in the developable land on a <br />site; and 3) utilization of economy of scale to lower overall construction costs for <br />detention. <br /> <br />Other benefits to regional detention, less apparent, are the following: <br /> <br />· Regional detention can be constructed to address some current drainage problems. <br />Early construction of regional detention to address future drainage could be <br />combined with detention to remedy current drainage. <br /> <br />5-14 <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 />