Lafayette Parish, Louisiana, Flood Control: Reconnaissance Report
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-~ IF.ml. ~ US Army Corps of Engineers New Orleans District --· ------------------------------------~---Lafayette Parish, Louisiana Flood Control Reconnaissance Report June 1995 SYLLABUS This report presents the findings· of a reconnaissance-level investigation of rainfall flooding associated with storm water runoff and high river stages along the Vermilion River in Lafayette Parish, Louisiana. The study was conducted as an interim study under the Mermentau, Vermilion, and Calcasieu Rivers and Bayou Teche, Louisiana study authority. The parent study was authorized by the Flood Control Act of 1944; the River and Harbor Act of 1945; and four separate resolutions of the Committee on Public Works of the United States House of Representatives adopted in 1964, 1966, 1968, and 1970. The study area is located in southern Louisiana and encompasses all of \ '., >, . LcLiayette Parish. The urban flood control study efforts concentrated on problem areas identified by the study team using input from Parish officials, Federal Emergency Management Agency (FEMA) repetitive damage data, and historical flooding information. The reconnaissance study investigated potential solutions to prevent flooding in Lafayette Parish caused by heavy rainfall and high stages on the Vermilion River. Impacts on adjacent parishes, as a result of proposed solutions, were considered. Alternative measures that were evaluated during this study include: diversion of flood waters; retention/ detention basins; channel modifications; removal of channel obstructions; levees and pump stations; flood control structures; and other non-structural alternatives. Existing computer models developed by the United States Army Corps of Engineers (USACE), previous hydraulic computer output, Federal Emergency Management Agency (FEMA) flood insurance studies and prior flood studies of the study area, and historical flood records were utilized to establish existing conditions. Two structural alternatives and non-structural measures (floodproffing) were determ~·,1ed economically and environmentally feasible to reduce the magnitude of flood damages in Lafayette Parish. The identification of feasible plans warrant proceeding to the feasibility phase of the study. TABLE OF CONTENTS ITEM PAGE INTRODUCTION STlJDY AUTiiORITY ............................................... 1 STUDY PURPOSE AND SCOPE . 4 THE REPORT AND STUDY PROCESS . 5 PRIOR STUDIES, REPORTS AND EXISTING PROJECTS . 6 PROBLEM IDENTIFICATION NATIONAL OBJECTIVES . 12 EXIS'I'JN"G CONDffiONS _ . 12 STU'DY AREA . • . • . • . 12 EXISTING DRAINAGE SYSTEMS . 13 CLIMATOLOGY AND HYDROLOGY . 15 CLIM.ATE . 15 TEMPERATURE . 15 PRECIPITATION . 15 WThJ'D .•....•............•................ 0 • • • • • • • • • • • 17 STREAM GAGING ...................................... · 17 FLOODS AND STORMS OF RECORD . 18 TIDES . • . • • • . • . 19 GENERAL GEOLOGY . 19 ECONOMIC RESOURCES . 21 GEOGRAPIDCAL INFORMATION . 21 POPULATION . 21 :IN'CO~ . 22 EMPLOYMEN'T . 22 BUSINESS AND INDUSTRY . 24 EXISTING ENVIRONMENTAL RESOURCES . 24 WETL..AN'DS " ..•••••.••••..•..••.•.•••.•..•.......... '° • • • • • • 24 WILDLIFE . 25 AQUATIC RESOURCES ....................................... 26 THREATENED AND ENDANGERED SPECIES ..................... 26 TABLE OF CONTENTS (CONTINUED) ITEM PAGE PROBLEM IDENTIFICATION (cont.) CULTURAL RESOlJRCES . 29 RECREATIONAL RESOlJRCES . 30 EXISTING WATER QUALITY ........................................ 31 WATER QUALITY STATIONS . 31 WATER USE DESIGNATION . 31 FUTURE CONDffiONS WITHOUT PROJECT . 33 FLOOD CON'I'ROL . 33 WATER QUALITY . 33 ECONOMICS RESOlJRCES . 33 ENVIRONMENTAL RESOlJRCES . 34 RECREATIONAL RESOURCES . 34 PROBLEMS, NEEDS, AND OPPORTUNITIES ......................... ,, . 36 FLOOD DAMAGES . 36 PLAN FORMULATION PLANNING OBJECTIVES ........................................... 38 PLANNING CONS'I'RAINTS ........................................ 38 HAZARDOUS AND TOXIC WASTE CONSIDERATIONS . 39 FLOOD DAMAGE REDUCTION PLAN DEVELOPMENT . 43 PLAN FORMULATION RATIONALE . 43 ALTERNATIVE PLAN SCREENING AND EVALUATION ............. 45 ALTERNATIVE 1: MODIFY THE VERMILION RIVER .......... 46 ALTERNATIVE 2A: RETENTION GRAVITY STORAGE TO THE BA YOU TORTUE SWAMP . 47 ALTERNATIVE 2B: MODIFY THE VERMILION RIVER WITH RETENTION GRAVITY STORAGE TO THE BAYOU TORTUE SWAMP . 49 ALTERNATIVE 3: COMBINED GRAVITY AND PUMPED RETENTION STORAGE TO THE BAYOU TORTUE SWAMP 50 ALTERNATIVE 4: DETENTION STORAGE JN THE UPPER TABLE OF CONTENTS (CONTINUED) ITEM PAGE PLAN FORMULATION (CONTINUED) VERMIUON RIVER BASIN WITH POSSIBLE MODIFICATIONS TO BAYOU CARENCRO AND RUTH CANAL . 52 ALTERNATIVE SA: CHANNEL MODIFICATIONS ON ISAAC VEROT COULEE (CONCRETE LINING AND EARTHEN EXCAVATION) . 53 ALTERNATIVE SB: CHANNEL MODIFICATIONS ON ISAAC VEROT COULEE (100% CONCRETE LINING) . 54 ALTERNATIVE 6: ALTER THE OPERATION OF THE TECHE VERMILION, COURTABLEAU, EASTERN RAPIDES SOUTH CENTRAL AVOYELLES SYSTEM TO ACIDEVE LOWERINGS IN LAFAYETIE PARISH . 54 ALTERNATIVE 7: NON-STRUCTURAL MEASURES . 56 INVESTIGATIVE METHODOLOGY . S6 AREA NUMBER 1 . 56 AREA NUMBER 2 . S7 AREA NUMBER 3 . 58 AREA NUMBER 4 . 58 PRESENTATION OF ECONOMICALLY FEASIBLE PLANS ................. 60 ALTERNATIVE 2A, ENGINEERING DESIGN ANALYSIS ............. 60 DESIGN FEATURES ..................................... 60 COULEE CROW GRAVITY DRAINAGE STRUCTURE . 61 BAYOU TORTUE GRAVITY DRAINAGE STRUCTURE . 61 BAYOU TORTUE PUMP STATION . 61 ADDffiONAL FEATURES . 62 CONSTRUCTION COSTS . 62 RELOCATIONS . 62 OPERATION AND MAINTENANCE . 62 REAL ESTATE . 62 ECONOMIC ANALYSIS .................................. 63 ENVIRONMENTAL ANALYSIS ............................ 64 WILDLIFE AND AQUATIC RESOURCES . 64 'WEUANDS ................................. ,,, . 65 THREATENED AND ENDANGERED SPECIES . 66 CULTURAL RESOURCES . 66 RECREATIONAL RESOURCES ....................... 66 ~GATION ................................... ,,, . 66 COMPLIANCE WI'1H REGULATIONS . 67 WATER QUALITY IMPACTS .............................. 67 ALTERNATIVE SA, ENGINEERING AND DESIGN ANALYSIS . 68 DESIGN FEATURES . 68 CHANNEL MODIFICATIONS ON ISAAC VEROT COULEE . 68 RELOCATIONS . 69 CONSTRUCTION COSTS . 69 OPERATION AND MAINTENANCE . 69 TABLE OF CONTENTS (CONTINUED) ITEM PAGE PLAN FORMULATION (CONTINUED) REAL ESTATE ......................................... 69 ECONOMIC ANALYSIS . 70 ENVIRONMENTAL ANALYSIS . 70 ENVIRONMENTAL RESOURCES . 70 DISPOSAL OF DREDGED MATERIAL . 71 THREATENED AND ENDANGERED SPECIES . 71 CULTURAL RESOURCES . 71 RECREATIONAL RESOURCES ....................... 71 MITIGATION . 71 COMPLIANCE WITH REGULATIONS . 72 WATER QUALITY IMPACTS .............................. 72 ALTERNATIVE 7, NON-STRUCTURAL MEASURES . 73 INVESTIGATIVE METHODOLOGY AND RESULTS ............ 73 DESIGN FEATURES AND COSTS ............................... 74 FLOOD CONTROL SUMMARY . 76 STUDY MANAGEMENT STUDY PARTICIPANTS AND COORDINATION ......................... 78 COST SHARING REQUIREMENTS . 78 PROJECT IMPLEMENTATION .................................. 79 POTENTIAL SPONSORS . 79 PRELIMINARY FINANCIAL ANALYSIS . 80 INTENT TO P ARTICIPA1'E . 80 CONCLUSIONS . 80 RECOMMENDATIONS . 81 EXHIBITS LEITER OF IN'TENT . 82 LIST OF TABLES NUMBER TITLE PAGE 1 MEAN MONTHLY AND ANNUAL TEMPERATURE . 16 2 TEN.1PERATUREEXTR1Th1ES ................................... 16 3 MONTHLY PRECIPITATION ................................... 16 4 MAXIMUM PRECIPITATION TOTAL . 17 5 STREAM GAGING DATA . 18 6 DISCHARGE DATA . 18 7 POPULATION TREND.