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<br />Taylor Bayou Watershed Master Drainage Plan <br /> <br />9.0 SUMMARY OF FINDINGS <br /> <br />This study was conducted to evaluate the drainage impacts and mitigation needs to serve the <br />proposed improvements in the Taylor Bayou Watershed and the TIRZ in La Porte, Texas. The <br />summaries of findings are as follows: <br /> <br />1. The hydrologic analysis revealed that 308.6 ac-ft of detention would be required to mitigate <br />fully developed conditions. <br /> <br />2. The proposed detention facilities will total approximately 422.1 ac-ft. <br /> <br />3. The detailed routing analysis revealed that 338.7 ac-ft of detention would be required to <br />mitigate fully developed conditions. <br /> <br />4. Three detention ponds and two waterway corridors are proposed to mitigate the increase in <br />runoff. <br /> <br />5. Two new channels are proposed and improvements to Al 04-12-0 1 are proposed to convey <br />the 100-year peak flow to the detention facilities. The proposed channels will be trapezoidal <br />channels with 10 foot bottom widths, 3:1 side slopes and will range in depth between 6 and <br />8 feet. <br /> <br />6. The project will require 107.7 acres to accommodate all the proposed improvements <br />associated with the drainage plan. <br /> <br />7. The total estimated construction cost for the proposed drainage improvements is <br />approximately $10,759,020 which includes a 20 percent contingency. <br /> <br />CivilT e{:h <br />Engineering, Inc. <br /> <br />27 <br />