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<br />k lot z .~. ass 0 C I ate 5 <br /> <br />the appropriate design frequency for the sewer system; 2) the inclusion of sheet flow <br />relief paths to address storm events in excess of the design capacity, and 3) the capacity, <br />spacing, and size of inlets. Temporary reduction in street inlet capacity due to inlet <br />clogging by debris is often a root cause of localized flooding. Frequent removal of trash <br />and debris from streets can be a key element in maintaining the capacity of stonn sewer <br />systems. <br /> <br />5.2.7.5 Minimal Detention Levels and Numbers of Detention Sites <br /> <br />The detention requirements identified for mitigation of proposed improvements, <br />diversion of flood waters, and storage for regional detention are estimated minimal <br />detention amounts to accomplish the intended purpose of the detention. Actual detention <br />volumes will be somewhat in excess of these amounts in order to provide potential <br />freeboard; estimated land acquisition for the pond will require inclusion of land for <br />surrounding maintenance berms and inlet and outlet structures. Detailed engineering of <br />the detention system in question will be necessary to refine these features. <br /> <br />One of the key issues in providing the required detention will be determination of <br />whether one site or more than one site will be used to meet detention requirements. <br />Detention does not necessarily have to always be provided by a pond at one site only. <br />The present CWDS report identifies, based upon apparent availability of open land, <br />potential detention sites. Detailed engineering can evaluate the feasibility of using one or <br />multiple sites for meeting detention requirements. <br /> <br />5.2.7.6 Enforcement of Drainage Criteria <br /> <br />Drainage criteria as defined by City policy should be rigorously enforced. Letter Report <br />No. 2 recommended certain modifications to the City's drainage criteria manual. <br />Irrespective of whether these recommendations are adopted, the criteria in the drainage <br /> <br />5-13 <br /> <br />Klotz Associates Project No. 0127.008.000 <br />January 2009 <br /> <br />La Porte Cilywide Drainage Study <br />City of La Porte <br />