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HomeMy WebLinkAbout(P1) AWC CPA-1030 12-19-23 Council Meeting Presentation (2)MASTERDRAINAGEPLAN UPDATE DECEMBER 19, 2023 Master Drainage Plan Drainage Criteria Manual Drainage System Inventory Database Engineered Drainage System Analysis Drainage Criteria Manual •Establishes a standard for analysis, design, and construction •Provides sustainable community growth •Intended to support the Master Drainage Plan and Drainage Regulations •Manual delivered to the City in January of 2023 •Recommend adopting final version into city ordinance System Inventory Database •Contains a complete inventory of all drainage assets within the City of Port Arthur •Contains sizing, details, and specifications •Electronic, living database maintainable by City staff •Can be shared and accessed between departments to better coordinate growth and maintenance •Database delivered to the City in November of 2023 OverallView System Inventory Statistics •Structures (inlets, manholes, grates, etc.) –11,306 •Code 1 (Clean) -3,966 •Code 2 (Needs to be cleaned) –5,308 •Code 3 (Needs to be repaired) –1,307 •Code 4 (Needs to be replaced) –397 •Code 5 (Inaccessible for inspection) –328 •Pipes –193 miles •Undersized (under 18” in diameter) –37 miles W 19th Street W 19th Street RepairStructures ReplaceStructures UndersizedPipes Engineering Analysis Report •A sophisticated model of the City of Port Arthur drainage system •Built for modeling, simulation, and analysis of actual system •Recommendations for system improvements based on simulated rainfall events •Results delivered to the City in December of 2023 Drainage Basins -Pump Stations 25-Year Inundation SurchargedSystem Improvement Recommendations •List of recommended system improvements is contained within the Engineering Report •This list is still growing based on ongoing modeling and analysis of the system TABLE 5-1 DRAINAGE SYSTEM RECOMMENDATIONS PROJECT ID DISTRICT DRAINAGE BASIN RECOMMENDATION D1-4 1 H This project will consist of removing and replacing existing undersized storm sewer mains and outfalls along Terminal Road from the Foley ditch outfall to W 19th Street. This project will also include the repair and replacement of associated inlet and… D1-5 1 H This project will consist of removing and replacing existing undersized storm sewer mains, storm sewer leads and addition of new storm sewer mains in the west end including W 19th Street, Texas Ave, W 18th Street, W 17th Street, W 16th Street, W 15th Street… Next Steps •Meeting scheduled with City staff January 8, 2024 to discuss: •Recommended improvement timelines •Optimize cost evaluations per improvement area •Any additional data requested for the finalized report •Joint Meeting with Drainage District 7 •Formally submit all pieces of the Master Drainage Plan based on City feedback