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<br />in Brookglen subdivision is due to backwater from Bl12-00-00 backing up into Bl12-02- <br />00. Bl12-02-00 has about 200-acres of contributing drainage area and the channel is <br />approximately 2,500-feet in length between Bl12-00-00 and Canada Road. Willow <br />Springs Gully (Bl12-00-00) 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 /> <br />The general scope of the Fairmont Park East and Brookglen Drainage Study is to present <br />our findings from performing a drainage analysis on the storm sewer system in Fairmont <br />Park East subdivision and provide alternatives for drainage improvements with associated <br />construction costs. In addition, Klotz Associates is tasked with investigating channel <br />geometry at the confluence of HCFCD Unit Bl12-00-00 and HCFCD Unit Bl12-02-00 <br />to determine improvement alternatives to reduce water surface elevations in HCFCD Unit <br />B 112-02-00 due to backwater build up. <br /> <br />These analyses were performed without the benefit of a survey or record as-built <br />drawings; therefore, the results are only estimates and should be verified by the use of a <br />survey and detailed methods during design. Storm Sewer depths were field measured <br />from the top of manhole rims and curb inlets then LiDAR was used to estimate elevations <br />of these structures. Results from this analysis are not intended for construction purposes <br />and should be verified with field survey and detailed storm sewer analysis. <br /> <br />1.2 Authorization <br /> <br />This study was authorized by the City of La Porte in an agreement dated February 6, <br />2009. <br /> <br />1-2 <br /> <br />Klotz Associates Project No. 0127.009.000 <br />May 2009 <br /> <br />Fairmont Park East & Brookg1en Drainage Study <br />City of La Porte <br />