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<br />k lot z 4~~ ass 0 cia t e s <br /> <br />Since only preliminary estimates of available right-of-way were used in development of <br />channel improvement alternatives, detailed right-of-way investigation will be required as <br />part of detailed project. design for some projects. Some modifications to proposed <br />improvements may be required as a consequence of such detailed investigation. <br /> <br />Environmental evaluation should also be anticipated to demonstrate the absence of <br />adverse environmental impacts for a particular project. Environmental review for <br />potential impacts on existent wetlands will be required if wetlands are identified within <br />the proposed project area. Furthermore, since channels may be modified by cut and fill <br />activities, US Army Corps of Engineers (USACE) Section 404 permit is required for <br />channel-affecting projects. In addition, for modification of channels (or portions of a <br />channel) which are tidally affected, USACE review and approval will be required <br />because tidal-affected waters are, by definition, waters of the United States and under the <br />jurisdiction of the US ACE. The need for significant coordination and review by the <br />USACE to address potential environmental impacts should be expected. <br /> <br />Proposed modifications to HCFCD channels or modification of discharges to HCFCD <br />channels will require review by HCFCD; of particular interest to HCFCD will be possible <br />increases in discharges and potential resulting downstream impacts. Mitigation of <br />discharges increases should be expected to be an approval requirement. <br /> <br />5.2.3 Tidal and Tropical Storm Influences <br /> <br />This CWDS does not specifically address surge impacts in Galveston Bay arising from <br />tropical storms or hurricanes. Unusually high tides induced by bay storms can induce <br />nearby shore flooding which drainage infrastructure cannot mitigate. High bay water <br />levels will propagate up primary and major tributary channels and, depending upon their <br />magnitude, may induce flooding. To limit adverse impacts from such effects, six primary <br />options are available: 1) early warning to citizens; 2) construction of finished floor slabs <br /> <br />5-7 <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 />