Covington Flood Response Plan with Resolution
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Flood Response Plan October 29, 2018 August Covington, Louisiana Flood Response Plan Plan Adoption Statement The primary role of government is to provide for the welfare of its citizens. The City of Covington has experienced floods in the past and will again in the future. The goal of this plan is to ensure that mitigation, preparedness, response, and recovery protocols are in place to protect the people, property, environment, and economy of Covington, Louisiana. This plan was adopted by the City of Covington, Louisiana City Council by resolution number 2018-28 on November 20, 2018. i Covington, Louisiana Flood Response Plan Record of Changes Change # Date Part Affected Date Posted Who Posted ii Covington, Louisiana Flood Response Plan Record of Distribution Plan # Office/Department Representative Signature 1 2 3 4 5 6 7 8 9 10 iii Covington, Louisiana Flood Response Plan This page intentionally left blank. iv Covington, Louisiana Flood Response Plan Table of Contents Flood Response Plan .................................................................................................................................. 1 I. Purpose, Scope, Situation Overview, and Assumptions ......................................................... 1 II. Concept of Operations ................................................................................................................. 4 III. Organization and Assignment of Responsibilities ................................................................... 5 IV. Direction, Control, and Coordination ......................................................................................... 8 V. Information Collection, Analysis, and Dissemination .............................................................. 8 VI. Communications .......................................................................................................................... 9 VII. Administration, Finance, and Logistics ..................................................................................... 9 VIII. Plan Development and Maintenance .......................................................................................... 9 IX. Authorities and References ....................................................................................................... 11 Appendix A: Triggers and Actions ........................................................................................................ A-1 Appendix B: Nearby Flood Gauges ....................................................................................................... B-1 Appendix C: Glossary and Abbreviations ............................................................................................ C-1 v Covington, Louisiana Flood Response Plan This page intentionally left blank. vi Covington, Louisiana Flood Response Plan Flood Response Plan I. Purpose, Scope, Situation Overview, and Assumptions A. Purpose The purpose of this plan is to define the actions and roles necessary to provide a coordinated response within the City of Covington, Louisiana. This plan provides guidance to Covington officials and departments with a general concept of potential emergency assignments before, during, and following emergency situations involving floods. B. Scope This plan applies to officials and departments that have a role in preparing for, responding to, and recovering from floods that affect the City of Covington. C. Situation Overview 1. Characteristics a. Location i. The City of Covington is located in the Florida Parishes region of Louisiana as a part of the Governor’s Office of Homeland Security and Emergency Preparedness (GOSHEP) State Region 9 and U.S. Department of Homeland Security Federal Emergency Management Agency (DHS/FEMA) Region VI. The City of Covington is located in the East Gulf Coastal Plain region of southeast Louisiana in west-central St. Tammany Parish. St. Tammany Parish is bordered by Washington Parish to the north; Tangipahoa Parish to the west; and Jefferson, Orleans, and St. Bernard parishes to the south. The State of Mississippi lies to the east, the boundary of which is delineated by the north- south flowing of the Pearl River. St Tammany Parish and the City of Covington are located in the area known as the North Shore of Lake Pontchartrain as part of the New Orleans-Metairie- Bogalusa Combined Statistical Area and the New Orleans- Metairie-Kenner Metropolitan Statistical Area. Adjacent cities and towns include the town of Madisonville and the city of Mandeville to the south, the town of Abita Springs to the east, and the village of Folsom to the north. The City of Covington covers a total area of 8.21 square miles, of which 8.02 square miles (97.7%) is land and 0.19 square miles (2.3%) is water. b. Geographic i. The East Gulf Coastal Plain region of southeast Louisiana is predominately flat with little elevation change south of the coastal Pleistocene terraces. Moving northward from Lake Pontchartrain, the terrain gradually shifts to rolling hills at the Mississippi state border. The City of Covington sits at an elevation of 26 feet 1 Covington, Louisiana Flood Response Plan above sea level with reference to North American Vertical Datum of 1988 (NAVD 88) datum. c. Demographics i. According to the U.S. Census Bureau, the population of Covington was 8,850 people in 2010, of whom 6,816 identified themselves as white alone, 1,666 as black alone, 35 as Native American alone, 55 as Asian alone, and 193 as another race alone or two or more races. The 2017 population estimate was 10,416. The persons per household (2012–2016) was 2.43 and the number of households was 3,547. 2. Hazard Profile a. Flood Types and History Flash flooding, riverine flooding, and areal flooding are the most common flood types affecting the City of Covington. Recorded incidents include flash floods and urban small-stream floods. Floods tend to be concentrated in low-lying areas near rivers and streams with damage ranging from negligible to costing millions of dollars. Significant flooding due to high-intensity precipitation occurred in November 1979, May and June 1983, May 1995, during Hurricane Katrina in August 2005, and in March 2016. 3. Bogue Falaya Boston Street Gauge and Associated Flood Impacts a. The National Weather Service Advanced Hydrologic Prediction Service maintains a web page with a hydrograph that has information about current conditions of the Bogue Falaya River at Boston Street in Covington. The hydrograph includes a record of recent past conditions, the current stage, and a prediction of future conditions. The web page also contains information about expected impacts at various river stages based on prior events, historic crests, recent crests, and low-water records. Listed below is a summary of impacts associated with river stages from the Boston Street Gauge website (https://water.weather.gov/ahps2/hydrograph.php?wfo=lix&gage=cvel1). The statements below should be analyzed to account for cumulative impacts. i. 5 Feet – Action Stage Officials from the St. Tammany Parish Office of Homeland Security and Emergency Preparedness should review the river stage forecast and potential impacts. They may discuss the situation with a National Weather Service (NWS) hydrologist(s) and/or notify local officials. ii. 6 Feet The river will leave its banks under the Boston Street Bridge and begin to flood the Bogue Falaya Towers property. 2 Covington, Louisiana Flood Response Plan iii. 7 Feet Water will rise onto the west bank, flooding property of the Bogue Falaya Towers at East Boston Street and threatening commercial property on the east bank near Military Road. Bogue Falaya River Park and Christ Episcopal School grounds will begin to flood. iv. 9 Feet Bogue Falaya River Park will be inundated. Some ground floor classrooms at Christ Episcopal School grounds will flood. v. 11 Feet There will be major flooding at Christ Episcopal School and Bogue Falaya River Park. vi. 12 Feet River Bend Road will be under water, threatening adjacent homes. Bogue Falaya River Park and Christ Episcopal School grounds will remain flooded. vii. 13.5 Feet Homes along River Bend Road will flood. Water will be in the ground floor classrooms of Christ Episcopal School. viii. 15 Feet Water on East Boston Street and on LA Hwy 21 east of the river will make driving hazardous. Low-lying areas near the Bogue Falaya and Abita rivers will flood. ix. 17 Feet Water will back up on the Abita River, flooding most of the area between U.S. Hwy 190 and LA Hwy 36. The river will be at the undercarriage of the East Boston Street Bridge. x. 20 Feet The flood of record occurred on March 12, 2016. Widespread flooding will develop in downtown Covington and below the gauge. Businesses will be inaccessible along parts of U.S. Hwy 190 and along Military Rd. The bridge at U.S. Hwy 190 will be inundated. Bogue Falaya Park and homes along the river will be flooded. D. Planning Assumptions 1. The NWS will issue watches and warnings that will help Covington officials anticipate flood conditions that may occur throughout the jurisdiction or the general area beyond the jurisdiction’s boundaries. 2. When the river stage on the Bogue Falaya River at Boston Street reaches 4 feet, the Covington Floodplain Administrator, along with other officials from the Covington Fire Department, Covington Public Works, and Covington Police 3 Covington, Louisiana Flood Response Plan Department who have opted in, will receive a text from the NWS alerting them of the situation. 3. It is assumed that flooding could cause