Klotz Draft Report for Fairmont Park East and Brookglen 072809

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Mr. Ron Bottoms July 22, 2009 Page 3 of 12 3. Document estimated impacts to HCFCD Units; B112-00-00, B112-02-00, B109- 03-00 and B 109-00-00, due to diverting flow in B 112-02-00 from Willow Springs Bayou (B 112-00-00) to Spring Gully (B 109-03-00). 4. This analysis is intended to document flow changes, pre -project and post -project computed water surface elevations in B112-00-00, B112-02-00, B109-03-00 and B109-00-00 due to the diversion for discussion purposes for two (2) options. for mitigation. 5. Prepare letter report. 6. Submit letter report for the analysis to La Porte, Harris County Flood Control District and Harris County reflecting the changes in flows and changes in water surface elevations to the 10, 50 and 100 year event storms. 7. This assumes one meeting will be needed to present and discuss the findings with HCFCD or Harris County. Note: The terms "broad based... analysis" are intended to describe the purpose, or convey the intent, behind the methods used in this analysis. Boundary conditions and drainage parameters were simplified the methodology for and to calculate estimated results connected with specific channel modifications in combination with detention, and for the purpose of exploring potential project alternatives and their related benefits and costs associated with said results and to determine the feasibility of implementing improvements described in this report.. This is not a detailed hydrologic and hydraulic study. This report is not intended to provide recommendations for the construction of detention sites or channel improvements, of any manner, without property detailed study and approval from Regulatory agencies that exercise jurisdiction over MS4s, or ditches, storm sewers, main stem streams or any system that functions to collect and/or convey storm water runoff, be it, owned or operated by a public agency; or Special Flood Hazard Areas (SFHA) defined by FEMA in the NFIP. Studied Area The study area is located in the City of La Porte (City), located in southeast Harris County, Texas, and is located in the Armand Bayou Watershed. The primary area of interest includes the subwatersheds of B 11202A, B 109A, B 112A and B112B. The studied channels include Willow Springs Bayou (HCFCD Unit B 112-00-00), Spring Gully (HCFCD Unit B 109-00-00), and Tributary to Willow Springs Bayou (HCFCD Unit B 112-02-00). The focus of this study is redirecting flows from B 112-02-00 from B 112- 00-00 to B109-03-00, contributing approximately 166-acres of residential development in subwatershed B 11202A.