06-11-18 Drainage and Flooding Committee Meeting

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REQUEST FOR DRAINAGE COMMITTEE AGENDA ITEM Agenda Date Requested: June 11, 2018 Requested By: L. Wingate/D. Pennell Department: Public Works Report: �*, Resolution: C-Ordinance: C- Exhibits : Appropriation Source of Funds: Account Number: Amount Budgeted: Amount Requested: Budgeted Item: 4, YES C-NO SUMMARY The segment of 6th St from W. Madison St to W. Main St is considered part of Old La Porte, which was generally noted in the City -Wide Drainage Study as not having sufficient storm sewer capacity due to undersized storm sewer, undersized storm inlets, and/or not enough storm inlets. RPS-Klotz provided an analysis of the existing storm sewer system to identify problem areas within the project limits and provide recommendations for improvements on 6th St and surrounding areas. The results proved that 6th St from W. Madison St to W. Main St has significant ponding in storm events as low as 5-year event. Recommendations for improvements were provided, however, areas would still experience ponding depths of approximate 6" to 2'. Thus, additional efforts are required to understand the root cause of flooding in the area and to recommend improvements to reduce flood risk within the area. To accomplish this goal requires an understanding of the limitations and deficiencies of the drainage systems that serve the region, hence the need to proceed with further evaluation of the most downstream section of the storm sewer system to determine the impact that improvements may have on the area upstream, which has been analyzed previously, and allow for objective prioritization of improvement recommendations in the form of Capital Improvement Plan (CIP) projects that are both functionally efficient and financially effective. Action Re quire d: Approved for Drainage Committee Agenda Corby D. Alexander, City Manager Date