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<br />k lot z ~~~ ass 0 cia t e s <br /> <br />would be either at one of the two sites, or, possibly smaller ponds would be used at each of the <br />optional sites. Detailed engineering analyses would be required to identify the optimal number, <br />configuration and sizes of individual ponds. In all situations, the pond configurations, locations, <br />and sizes shown are only approximate. <br /> <br />In special situations, mitigation may be avoided if it can be demonstrated that adverse impacts or <br />are absent or of very little consequence. An example of this possibility is provided by the <br />improvements for Ditch F216-01-00, for which three alternatives have proposed (projects 26, 28, <br />and 30 in Table ES-l). Project Options 26 and 28 include a mitigation pond; however, the <br />channel improvement extends to the confluence ofF216-01-00 and F216-00-00, which lies quite <br />close to Galveston-Bay. Thus locations downstream of the channel improvements' potential <br />impacts are quite limited in extent, and because of the relatively large flows that occur in F216- <br />00-00, the increases in flow due to improvements along F216-01-00 may be so small, in a <br />relative sense, that they are inconsequential. Hence, mitigation of the channel improvement may <br />be unnecessary. Detailed engineering analysis would be required to confirm this speculation. <br /> <br />It is recognized that using channel lining to improve channel conveyance capacity is not <br />desirable from an environmental or permitting perspective. On the other hand, widening of the <br />channel with 3: 1 or flatter side slopes will often result in a channel width that will significantly <br />impact adjacent properties, including in some instances actual residences and consequent <br />requirements for possible buy-out of affected residences. <br /> <br />Therefore, the option of off-channel diversion detention storage is sometimes considered. Table <br />ES-l identifies proposed detention ponds for diversion use while Figures ES-l through ES-6 <br />show approxinlate locations of the diversion ponds. Pond configurations, locations, and sizes <br />shown are only approximate. When optional locations are available for a mitigation pond, the <br />optional locations are shown. <br /> <br />EN-8 <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 />