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<br />k lot z .~~ ass 0 cia t e s <br /> <br />improvements, the City might be hard pressed to acquire the needed acreage for building <br />the detention ponds. However, there are available undeveloped tracts south of the City <br />along these channels that could be used as detention sites. <br /> <br />5.2.6 Drainage Interaction with Other Cities <br /> <br />The recommended drainage improvement projects are within the boundaries of the City. <br />This constraint on selection of projects was purposely made in order that implementation <br />ofprojects could be pursued at the City's own discretion and without potentially delaying <br />or undesirable encumberment. However, two factors should be borne in mind in dealing <br />with drainage issues extending across city boundaries. <br /> <br />Mitigation of increased runoff due to drainage improvements within the City may often <br />be required to prevent adverse impacts upon downstream locations beyond the City's <br />boundaries. Increasing the capacity of a channel will typically result in increased <br />discharges to downstream reaches. To determine whether such increases will be <br />significant will require detailed engineering analysis done as part of detailed design for a <br />particular project. If such increases are found to be significant, detention or flow <br />impediment will typically be required to prevent such downstream increases. If such <br />increases are significant at points beyond the City's boundaries, special caution and <br />application of appropriate mitigation will need to be exercised to avoid adverse impacts <br />on downstream areas beyond the City boundaries. <br /> <br />On the other hand, the drainage improvements identified in this CWDS assume that <br />drainage from sources outside of and upstream of the City will not be increased by <br />actions of others. If the City were to become aware of anticipate changes of conditions in <br />upstream areas which might adversely impact drainage or flooding conditions, the City <br />should coordinate with the upstream cities to address such anticipated impacts. This <br />coordination should provide a clear and descriptive enunciation of why adverse impacts <br /> <br />5-10 <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 />