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<br />1. Mitigation Plans <br />II. Flood Insurance Data <br />m. Drainage Information <br />IV. Flooding Experiences of Property Owners <br />V. On-site Data Collection <br /> <br />I. Mitigation Plans <br /> <br />The UNO-CHART Team reviewed the following plans for information related to flooding in the <br />study area: <br /> <br />A. La Porte 2020 Comprehensive Plan <br />B. Harris County All Hazard Mitigation Plan (Harris County, 10/02/2005) <br /> <br />A. La Porte 2020 Comprehensive Plan1: The City of La Porte completed a 20-year <br />comprehensive plan in 2005. The plan discusses the flooding hazard in Chapter 11. <br /> <br />Chapter 11- Public Safety: Chapter 11, Public Safety, notes that the most devastating flood <br />threat is storm surge from a hurricane or tropical storm. Heavy rains associated with tropical <br />events, sometimes 20 to 30 inches, can overwhelm a drainage system. The storm surge from a <br />category 5 hurricane could flood La Porte up to 10 feet deep. Although it is the greatest flood <br />threat, this is not discussed as part of this repetitive flooding analysis since this area of La Porte <br />has not experienced such a storm surge flood, <br /> <br />B. Harris County All Hazard Mitigation Plan2: The City of La Porte adopted the Harris <br />County All Hazard Mitigation Plan in April 2005. The flood hazard (flood, hurricanes and <br />coastal storms, dam and levee failure) is identified, analyzed, and assessed in Sections 4.1, 4.2, <br />and 4.3. According to the Plan, flooding is the greatest threat to Harris County due to numerous <br />rivers and streams. In fact, flash flooding is common during a heavy rain event. One such <br />instance of flash flooding that will live in the memory of residents of Texas' east coast is <br />Tropical Storm Allison. This historic storm occurred on June 5, 2001, and struck Harris County <br />by surprise, as the storm only formed earlier that day. Allison dumped as much as 12 inches of <br />rain in four hours on Harris County. The Port of Houston reported 37 inches of rain. Over <br />73,000 residences in Harris County were flooded, as were hundreds of businesses in the greater <br />Houston area. Allison was responsible for 22 deaths in Harris County and a total of at least $5 <br />billion in damage in the United States. <br /> <br />1 Copies of the La Porte 2020 Comprehensive Plan are available on the City of La Porte's website: www.ci.la- <br />porte.tx.us <br /> <br />2 Copies of the Harris County All Hazard Mitigation Plan are available from the La Porte office of Emergency <br />Management <br /> <br />Brookglen Area Analysis - DRAFT <br /> <br />6 <br /> <br />9/8/2008 <br />