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in Brookglen subdivision is due to backwater from B112-00-00 backing up into B112-02- <br />00. B112-02-00 has about 200-acres of contributing drainage area and the channel is <br />approximately 2,500-feet in length between B112-00-00 and Canada Road. Willow <br />Springs Gully (B 112-00-00) is a concrete lined trapezoidal channel with a four -foot (4 ft) <br />deep low flow section. The low flow section is twelve -feet (12 ft) wide upstream of the <br />confluence and twenty -feet (20 ft) wide downstream of the confluence. <br />The general scope of the Fairmont Park East and Brookglen Drainage Study is to present <br />the findings from performing a drainage analysis on the storm sewer system in Fairmont <br />Park East subdivision and provide improvement alternatives with associated construction <br />costs. In addition, Klotz Associates investigated channel geometry for HCFCD Unit <br />B 112-00-00 and HCFCD Unit B 112-02-00 to determine improvement alternatives for <br />reducing water surfaces in HCFCD Unit B 112-02-00 due to backwater build up. <br />These analyses were performed without the benefit of a survey or record as -built <br />drawings. Storm Sewer depths were field measured from the top of manhole rims and <br />curb inlets then LiDAR was used to estimate elevations of these structures. Results from <br />this analysis are not intended for construction purposes and should be verified with field <br />survey and detailed storm sewer analysis. <br />1.2 Authorization <br />This study was authorized by the City of La Porte in an agreement dated February 6, <br />2009. <br />1-2 <br />Klotz Associates Project No. 0127.009.000 Fairmont Park East & Brookglen Drainage Study <br />May 2009 City of La Porte <br />