VLAWMO Annual Financial Report 2018 (2)

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SECTION 1 SECTION 2 SECTION 4 SECTION 5 2018 ANNUAL REPORT LAMBERT CREEK STUDIES VLAWMO worked with Houston Engineering in 2018 to create a comprehensive survey of Lambert Creek. The survey used historical documentation with hydrology & hydraulic modeling (H & H) to assess the main creek in addition to its branch ditches. Additionally, it sought to identify areas that may require repair or maintenance to return the system to its as originally constructed condition. If the original condition isn't possible,the model will aid in assessing which improved conditions are feasible. This concept of the current alignment of Ditch 14 and its branch ditches, based on past improvements, projects, and development is termed as As Constructed and Subsequently Improved Condition (ACSIC). The survey and model now serve as valuable tools for planning and decision making for Lambert Creek. Assets include: • A survey and documentation of elevations for baseline reference. • A guide for effectively re-establishing the ditch system. • Documentation of 2,10, and 100 year flood elevations. • An XP SWMM model that enables analysis of improvements, providing guidance for cost-effective actions. • Repair options that benefit future planning and decision making for reasonable function of the Ditch. LAMBERT CREEK MAINTENANCE In Spring of 2019 VLAWMO worked with the Institutional community Work Crew (ICWC) to remove tree and woody debris from a two mile stretch of Lambert Creek. Maintenance was needed to improve flow and efficiency of the creek. ICWC clearing debris in Lambert Creek VLAWMO staff documented creek levels at the Kohler road flume after a 3.75" rain event. Creek levels at the flume demonstrated a functioning drainage system, returning to average 3 days after the high water levels. The gauge at the flume indicates a 1' drop within the specified time frame. 21