English Bayou Basin Storm Water Master Plan Presentation to Calcasieu Parish Police Jury Lake Charles April 29, 2010

Project Objectives Develop hydrologic and hydraulic models for storm waterDevelop hydrologic and hydraulic models for storm water Identify flood prone areasIdentify flood prone areas Identify undersized major culverts, drainage channel limitations and other watershed deficienciesIdentify undersized major culverts, drainage channel limitations and other watershed deficiencies Develop alternatives for Capital Improvement PlanDevelop alternatives for Capital Improvement Plan

Project Tasks Collect and organize existing relevant data (Geospatial data, hydrologic and climatic data, environmental data)Collect and organize existing relevant data (Geospatial data, hydrologic and climatic data, environmental data) Perform topographic surveys on all modeled channels and structuresPerform topographic surveys on all modeled channels and structures Develop hydrologic and hydraulic modelsDevelop hydrologic and hydraulic models Analyze existing conditions and drainage issuesAnalyze existing conditions and drainage issues Develop improvement alternatives and recommendationsDevelop improvement alternatives and recommendations

Project Area The English Bayou Basin consists of approximately 90 square miles; approximately 41 miles of drainage channel (shown in blue) were analyzed.

Existing Conditions

Antoine GullyAntoine Gully

Proposed Improvements Flood-prone areas and channel deficiencies were identified.Flood-prone areas and channel deficiencies were identified. Recommended improvements include:Recommended improvements include: –Replacement of undersized culverts –Modifications/upgrading of road crossings –Channel improvements (widening & deepening) –Channel paving –Detention Basins Construction cost estimatesConstruction cost estimates

Proposed Improvements Examples English Bayou Channel ImprovementEnglish Bayou Channel Improvement

Proposed Improvements Examples English Bayou Channel ImprovementEnglish Bayou Channel Improvement

Proposed Improvements Examples English Bayou Channel ImprovementEnglish Bayou Channel Improvement

Proposed Improvements Examples Bayou Arsene Channel Cleaning and GrubbingBayou Arsene Channel Cleaning and Grubbing

Summary of Proposed Improvements IDDescriptionCost Estimate English Bayou EB-1AConcrete Lined Channel along EB L-14$5,055,375 EB-1BDetention Pond along EB L-14$38,000,000 EB-2Cleaning and Grubbing EB L-12$47,000 Antoine Gully AG-1Cleaning and Grubbing of AG-1$22,750 Bayou Arsene BA-1Cleaning and Grubbing of BA-1$288,800 to $577,200

Summary of Proposed Improvements IDDescriptionCost Estimate Kenner Gully KG-1Channel Improvement along KG-1$2,100,000 KG-2Cleaning and Grubbing along L-2$139,100 Coon Gully CG-1AChannel Improvement of CG-2$213,900 CG-1B Alternative CG-1 with pond improvements$408,900 CG-2Storm Sewer along Nanna Rd$1,000,000 CG-3Cleaning and Grubbing along CG-1$161,200 to $322,400

Questions?

Proposed Improvements Examples Coon Gully ImprovementCoon Gully Improvement

Proposed Improvements Examples English Bayou Channel ImprovementEnglish Bayou Channel Improvement

Study Channels