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Drainage Report — Impact and Mitigation Analysis San Jacinto and Galveston Bay <br />Watershed; Proposed Fairmont Parkway Improvements From 161h Street to state HW 146 <br />Prepared For: Harris County <br />Prepared By: TSC Engineering Company <br />December 2005 <br />Signed By: Brian X Tao <br />Drainage impacts caused by the proposed roadway improvements are identified in terms <br />of 10-year and 100-year peak flow. There will be mitigated by providing additional <br />detention storage in enlarged ditches and storm sewers for the proposed roadway <br />improvements. In addition, as part of the roadway improvements, the storm sewers along <br />Fairmont Parkway will be replaced from 161h Street to SH 146. The proposed storm <br />sewers are sized and designed based on the City of Houston's 3-year frequency rainfall <br />runoff curve s-509 and standard Harris County criteria. The proposed roadway project is <br />within the Little Cedar Bayou watershed, a sub watershed to San Jacinto and Galveston <br />Bay Watershed. The project drainage area drains into a 65" x 40" arch pipe storm sewer <br />under SH 146, then drains eastward to discharge into the Little Cedar Bayou (HCFCD <br />Unit F216-00-00). For areas along Fairmont Parkway between UPRR and 161h Street, the <br />flow is collected through roadside/median ditches, then discharge into roadside/median <br />ditches along Fairmont Parkway east of 161h street. Currently, TxDOT constructs the <br />overpass project in this portion of Fairmont Parkway. For areas along 161h Street north <br />and south of Fairmont Parkway, the flow is collected through roadside ditch, then <br />discharged into roadside ditches along Fairmonth Parkway east of 161h Street. <br />