Lower Sabine Watershed Discovery Report - RiskMAP6

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Tables (continued) Table 17: Comparison of 1-Percent Annual Peak Flows of Gage Frequency Analysis and Effective Discharges ................................................................ 39 Table 18: Comparison of 1-Percent Annual Peak Flows of Regulated Years of Record for the Sabine River ......................................................................... 40 Table 19: Summary of Hydraulic Analysis: ................................................................... 41 Table 20: Potential Watershed Actions ....................................................................... 49 Table 21: Metrics and Rankings of Needs / Actions ..................................................... 55 Figures Figure 1: Lower Sabine Watershed and Communities ................................................... 3 Figure 2: Percent Urban Cover Lower Sabine Watershed ............................................. 5 Figure 3: Population Density Lower Sabine Watershed (Census 2010) ....................... 6 Figure 4: Risk Factors and Topographic Data Availability for the Lower Sabine Watershed .......................................................................................................15 Figure 5: Sabine River SFHA Disconnects – Beauregard, Newton, and Calcasieu ..... 43 Figure 6: Sabine River, Toro Bayou SFHA Disconnects – Newton, Sabine, and Vernon .......................................................................................................... 44 Figure 7: Sabine River SFHA Disconnects – Orange, Cameron, and Calcasieu ......... 45 Figure 8: Adams Bayou SFHA Disconnects – Newton and Orange ........................... 46 ii
Acronyms and Abbreviations AAL BFE CAV cfs CLOMR CNMS CRS CTP DEM DETCOG FEMA FIRM FIS FM FMI FPA G&S GIS GOSHEP Hazus HEC-1 HEC-2 HEC-HMS H&H HMP HUC HWM LaDOTD LaCPRA LiDAR Average Annualized Loss base (1-percent-annual-chance) flood elevation Community Assistance Visit cubic feet per second Conditional Letter of Map Revision Coordinated Needs Management Strategy Community Rating System Cooperating Technical Partner Digital Elevation Model Deep East Texas Council of Governments Federal Emergency Management Agency Flood Insurance Rate Map Flood Insurance Study Farm-to-Market Floodplain Management and Insurance Floodplain Administrator Guidelines and Specifications for Flood Hazard Mapping Partners geographic information system State of Louisiana Governor’s Office of Homeland Security and Emergency Preparedness Hazards U.S. Hydrologic Engineering Center – Hydrologic Model Program Hydrologic Engineering Center – Hydraulic Model Program Hydrologic Engineering Center – Hydrologic Modeling System hydrologic and hydraulic Hazard Mitigation Plan Hydrologic Unit Code high water mark Louisiana Department of Transportation and Development Louisiana Coastal Protection and Restoration Authority Light Detection and Ranging iii
Page 1 and 2: Discovery Report Lower Sabine Water
Page 3: Table of Contents Acronyms and Abbr
Page 7 and 8: I. Discovery Overview The Federal E
Page 9 and 10: Figure 1: Lower Sabine Watershed an
Page 11 and 12: Figure 2: Percent Urban Cover Lower
Page 13 and 14: Other important stakeholders in the
Page 15 and 16: County’s FIRMs and provide a unif
Page 17 and 18: mileage from CNMS for the whole Wat
Page 19 and 20: Table 8: NFIP Insurance Claims by C
Page 21 and 22: Figure 4: Risk Factors and Topograp
Page 23 and 24: The Engagement Plan is a tool that
Page 25 and 26: Discovery Workshop attendees to lis
Page 27 and 28: were appreciative of the chance to
Page 29 and 30: Data collected in the pre-discovery
Page 31 and 32: Table 13: Data Collection Summary -
Page 33 and 34: Table 13: Data Collection Summary -
Page 35 and 36: All supporting information, data, a
Page 37 and 38: i. Pre-Discovery CNMS Analysis Tabl
Page 39 and 40: Summary of CNMS Concerns Beauregard
Page 41 and 42: Newton County, Texas: Newton County
Page 43 and 44: and Orange Counties have effective
Page 45 and 46: Table 17: Comparison of 1-Percent A
Page 47 and 48: iii. Pre-Discovery Hydraulics and F
Page 49 and 50: Figure 5: Sabine River SFHA Disconn
Page 51 and 52: Figure 7: Sabine River SFHA Disconn
Page 53 and 54: iv. Engineering Review of Community
Page 55 and 56:
Table 20: Potential Watershed Actio
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Table 21: Metrics and Rankings of N
Page 63 and 64:
Page 65 and 66:
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