10-13-08 Drainage and Flooding Committee minutes

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k lot z 4~. ass 0 cia t e s 2.2.2 Clear Creek Watershed The Clear Creek watershed drains into Clear Lake which eventually outfalls to Galveston Bay. The central and southern sections of the city lie in the Clear Creek watershed. The primary drainage channels and their major tributaries in this watershed are listed Table 2-1 and shown in Exhibit 2-7. Drainage area sizes and levels of current development for these channels and tributaries are also summarized. To be noted about these watercourses is the following: Channel AI04-07-00 is characterized as a large, well-maintained, straight channel, while Taylor Bayou (AI 04-00-00) and AI04-I2-0I are mostly natural channels with heavy forested overbanks. Flooding in some areas of this watershed has been studied in prior FEMA studies, but the studied areas in these prior studies lie generally to the south of the City. Taylor Bayou (A104-00-00) and Channel AI04-07-00 (see Exhibit 2-7), which are primary City drainage channels in this watershed, have been previous modeled by FEMA but not through the City; consequently floodplains in the City within this watershed have not been previously delineated. 2.2.3 San Jacinto/Galveston Bay Watershed The San Jacinto/Galveston Bay Watershed drains into Galveston Bay and encompasses the eastern portions of the City. Land use is predominately residential in this watershed. The primary drainage channels and their major tributaries in this watershed are listed Table 2-1 and shown in Exhibit 2-8. Drainage area sizes and levels of current development for these channels and tributaries are also summarized. Little Cedar Bayou (F216-00-00) and Deer Creek (F212-00-00) are mostly characterized as natural, 2-4 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City of La Porte