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channels consist of natural bayous, man -made, but natural - looking <br />channels, and concrete channels. (see inset) <br />In 2007, the City participated in the Federal Emergency Management <br />Agency (FEMA) sponsored Tropical Storm Allison Recovery Program <br />(TSARP), which resulted in revised 100 -year flood maps (also known <br />as FIRMS, i.e., flood insurance rate maps) that became effective on <br />June 18, 2007. In 2009, the City undertook a City -wide drainage <br />study to identify, develop, and recommend improvements to <br />address drainage problems and lessen flooding and its impacts <br />across the City. In addition to natural causes common to coastal <br />areas (e.g., storm surge), the plan identified six reasons causing the <br />City's existing drainage and flooding problems.' They were: <br />1) Insufficient flow capacity in ditches and channels; <br />2) Ponding of waters in streets and adjacent properties; <br />3) Undersized storm sewers; <br />4) Temporary blockage of storm water inlets by debris; <br />5) Backup of storm waters in sewers; and <br />6) Lack of overland or sheet flow paths. <br />As part of that study, the City requested that past repetitive loss data <br />be studied to determine the level of severity of drainage and <br />flooding problems so that the City could identify priority projects on <br />a subdivision -level scale. The report identified 27 subdivisions that <br />had significant drainage or flooding problems, with Brookglen, <br />Creekmont Section 1, Glen Meadows, Fairmont Park East, Pinegrove <br />Valley, and Spencer Highway Estates being the highest ranked <br />problem areas . 4 <br />As solutions to these identified problems, the plan identified <br />remedies to correct current flooding and drainage problems, as well Im <br />as mitigation techniques to prevent future drainage problems that could <br />arise from new development. To address current drainage and flooding <br />problems, the plan recommended the following four types of projects: <br />1) Channel improvements; <br />2) Detention ponds for flood flow diversion; <br />3) Storm sewer upgrades; and <br />4) Development of relief swales. <br />o I <br />A COMMUNIT VISION FOR 1A PORTE, TEXAS - 2010 UPDATE <br />