Drainage_and_Flooding_Report-dated_03-10-08

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Taylor Bayou Watershed Master Drainage Plan; Tax Increment Reinvestment Zone #1, La Porte, Texas Prepared For: City of La Porte Prepared By: CivilTech Engineering, Inc. August 2003 Signed By John D. Conquest This report presents technical analyses and findings relative to the impact of the proposed development of the Taylor Bayou Watershed and City of La Porte Tax Increment Reinvestment Zone #1. It also addresses the proposed channels, waterway corridors and detention facilities to convey and mitigate the potential impacts. A Master Drainage Plan was developed for the Tax Increment Reinvestment Zone #1 (TIRZ) and areas contributing to the Taylor Bayou watershed within the City of La Porte. This master drainage plan addresses mitigation and drainage infrastructure requirements and consists of a complete impact analysis for the ultimate development of the TIRZ. A detailed watershed analysis was performed using HEC-1 computer models. The impact analysis concluded that the proposed development of the TIRZ would increase peak flows in Taylor Bayou at the confluence of Taylor Bayou (HCFC Unit A104-00-00) and HCFC Unit A104-012-01 by 1,122 cfs. The routing analysis concluded that approximately 325 ac-ft of detention mitigation would be required to offset the increase in peak flows due to the TIRZ development. The drainage analysis determined that three separate detention ponds and two waterway corridors totaling about 104 acres in size will provide the necessary detention volume. Three culvert structures will serve as outfall for the detention ponds.