WORKING DRAFT July 6, 2016 NOT FOR CITATION

Transcription

1 Towards a More Resilient Waterfront: Screening Tool for Assessing a Marina s Environmental, Infrastructure, and Operational Risk to Storms and Flooding

2 Acknowledgements This tool builds upon the work of the URI Ocean Engineering Senior Design Studio of , and was adapted by the URI Coastal Resources Center as a contribution to the Rhode Island Shoreline Change Special Area Management Plan effort, in coordination with the Rhode Island Coastal Resources Management Council and the Rhode Island Marine Trades Association. Additionally, Brewer Greenwich Bay, Brewer Cove Haven, International Yacht Restoration School, Point Judith Marina and the Newport Maritime Alliance were essential during the development and pilot testing of the tool. The team acknowledges Rhode Island Sea Grant, 11th Hour Racing, and the van Beuren Charitable Foundation for their support of this initiative. URI Coastal Resources Center & Rhode Island Sea Grant: Pam Rubinoff, Matthew Frediani URI Ocean Engineering Professors: Dr. Malcolm Spaulding, Dr. Craig Swanson Rhode Island Coastal Resources Management Council: Grover Fugate, Dan Goulet URI Ocean Engineering Senior Design Studio: Nicholas Brown, Bradford Carvalho, Frank Giles, Wendy Laurent, Benjamin Lodge, Kelley McBride, Charles McGann, Darien McLaughlin, Jason Peck, Dennis Tierney Page 2

3 Purpose Statement To support decisions for marina planning and management that enhances business resilience by considering coastal storm hazards today and in the future This screening tool will: Serve as a preliminary desktop assessment for marinas to better gauge risks from coastal storm surge and flooding today and in the future with increased sea levels and storm intensity. Examine individual infrastructure and operational components to determine which components of the marina are at greater risk than others to flooding impacts. Provide an overall numeric score indicating the level of risk faced by the marina. Highlight a menu of good management practices to reduce risks identified through the assessment. Resources to use for this Assessment: The following assessment utilizes coastal flooding maps adapted from STORMTOOLS a program used to map storm inundation with and without sea level rise for varying return periods developed by the University of Rhode Island (URI) and Rhode Island Coastal Resources Management Council (CRMC). For more information on STORMTOOLS visit Page 3

4 Page 4 WORKING DRAFT July 6, 2016 NOT FOR CITATION

5 Water Levels and Storm Reference Pictures (Where noted, MHHW = Mean higher high water) Watch Hill Yacht Club - Watch Hill, RI October above MHHW* (approximately equivalent to 100% annual chance flood along RI s southern coast) Photo: H. Hanka Town Dock North Kingstown, RI June above MHHW Photo: Jeff Michaelson This nuisance flooding of low lying areas is often seen during extreme high tides, especially when there is a wind setup. Bowen s Wharf - Newport, RI Superstorm Sandy, October 2012 According to the National Weather Service, the winds reached 86mph in Westerly and the water level was 4.3 above MHHW at the Newport Tide Gauge. This is approximately equivalent to a 4% annual chance storm along RI s southern coast. Photo: Newport Daily Edgewood Yacht Club - Cranston RI Hurricane Carol, 1955 During the storm there were sustained winds of 90 mph and a recorded gust at 135 mph on Block Island. Narragansett Bay experienced a storm surge of 14.4 feet. The 1% annual chance storm is modeled to bring a surge of 7.53 feet to this location. Photo: NOAA ( *MHHW = Mean higher high water Page 5

6 Section 1: Assessing Environmental Risk Factors for Marinas Use the map link as a reference to answer questions 1-4. For question 5, use your own knowledge or Google Earth. Question 6 provides a link to help answer that question. For each question locate your marina on the appropriate map and determine the percent of the landside facilities that are flooded by the particular storm event. Utilize personal experience in collaboration with the maps provided to determine realistic answers. Low = 1 point, Moderate = 2 points, High = 3 points Questions 1. Is the marina at risk of nuisance flooding for a 100% annual chance storm (1-year return period)? Low= less than 25%; Moderate = approx. 50%; High = greater than 50% 2. Is the marina at risk of nuisance flooding for a 10% annual chance storm (10-year return period)? Low= less than 25%; Moderate = approx. 50%; High = greater than 50% 3. Is the marina at risk of flooding for a 2% annual chance storm (50-year return period)? Low= less than 25%; Moderate = approx. 50%; High = greater than 50% 4. Is the marina at risk of flooding for a 1% annual chance storm (100-year return period)? Low= less than 25%; Moderate = approx. 50%; High = greater than 50% 5. What is the greatest distance of your marina s fetch measurement of the distance that indicates how far wind travels over open water? Low = miles; Moderate= miles; High=3.1 and greater miles 6. Is your property impacted from shoreline erosion? Low=0-0.5 feet; Moderate= foot; High=greater than 1 foot Use your discretion to determine whether your property is impacted at a low, moderate, or high risk from shoreline erosion. This may mean either your property is eroding or that the properties adjacent to yours are impacted. For more information on shoreline erosion, visit Risk Level (Low, Mod, High) Points SECTION 1 SUMMARY Sum of Points [A] Maximum Potential Points = [C] =18 Resilience Score = Sum of Points/ Maximum Potential Points = [A]/[C] = Risk Level (Circle one): Low (0-0.33) Moderate ( ) High ( ) Low Risk Moderate High Risk Page 6

7 Section 2: Assessing Present Day Infrastructure Risk Factors for Marinas Use the map link and locate your marina to answer questions below, At the top of the map, there are tabs that correspond to each different storm scenario. Using the maps, locate each asset and note the current height above ground (from your personal knowledge). Then click on the location to find the depth of water to determine if that asset is impacted. If the answer is yes place a 1 in the box and if the answer is no place a 0. If you do not know the answer or the Are the following assets impacted by flooding of different storms? In the blank space next to each category enter the height off the ground for that asset. 1. Main circuit breaker 2. Electrical sub stations 3. Access road 4. Fuel tanks (Piping, power supply, emergency shutoff, etc.) 5. Hazardous material (storage & disposal) 6. Pump out 7. Buildings 8. Boat Storage 9. Fixed piers 10. Piles Current Height off ground Very Frequent (100% annual chance) Frequent (10% annual chance) Occasional (4% annual chance) Very Infrequent (1% annual chance) Yes = 1 point, No = 0 points, or indicate Don t Know or Not Applicable (N/A) Total "Don't Know or N/A Total Points SECTION 2 SUMMARY Sum of Points [A] [B] Maximum Potential Points = [C] = 40 [A] = Resilience Score = Sum of Points/ Maximum Potential Points = [B]/[C] = Risk Level (Circle One): Low (0-0.33) Moderate ( ) High ( ) Page 7 Low Risk Moderate Risk High Risk

8 Section 3: Assessing Operational Risk Factors for Marinas Questions Yes No Yes = 0 point, No = 1 point, Don t Know = discard question 1. Does your marina have a written emergency preparedness plan? 2. Are all employees aware and trained in their roles in the preparedness plan? 3. Are boat preparedness steps defined in berthing agreement, communicating the responsibilities of the clients in the emergency preparedness plan? 4. Do you have a plan/ personnel to enforce the responsibilities of clients? 5. Does your facility stock emergency supplies at all times? (i.e. flashlights, batteries, water, generators, etc ) 6. Does your marina have the ability to haul vessels during all tides? 7. Does your marina have an active evacuation plan with signs posted around your marina? 8. Does your emergency preparedness plan incorporate backing up computers and storing sensitive files, documents, and other important equipment offsite? 9. Does your emergency preparedness plan incorporate reviewing your insurance policy and taking photos of inventory prior to storms for potential insurance claims? 10. Does your business have a post-storm recovery plan or business continuity plan? Don t Know / NA Point values SECTION 3 SUMMARY Sum of Points [A] [B] Maximum Potential Points = [C] = 10 [A] = Resilience Score = Sum of Points / Maximum Potential Points =[B]/[C] Risk Level (circle one) = Low (0-0.33) Moderate = ( ) High = ( ) Low Risk Moderate Risk High Risk Page 8

9 Section 4: Looking Ahead 20 Years in the Future Use the map link h t t p : / / w w w. a r c g i s. c o m / a p p s / M a p S e r i e s / i n d e x. h t m l? a p p i d = 4 b 6 1 a a 4 b c 3 a b 5 a a 5 b f 1 and locate your marina to answer questions below, At the top of the map, there are tabs that correspond to each different storm scenario. Using the maps, locate each asset and note the current height above ground (from your personal knowledge). Then click on the location to find the depth of water to determine if that asset is impacted. If the answer is yes place a 1 in the box and if the answer is no place a 0. If you do not know the answer or the Are the following assets impacted by flooding? In the blank space next to each category enter the height off the ground for that assest. Current Height off ground 1. Main circuit breaker 2. Electrical sub stations 3. Access road 4. Fuel tanks (piping, power supply, emergency shutoff, etc.) 5. Hazardous material (storage & disposal) 1 Sea Level Rise 4% Annual Chance + 1 of Sea Level Rise 1% Annual Chance + 1 of Sea Level Rise Yes = 1 point, No = points, or indicate Don t Know or Not Applicable (N/A) Total "Don't Know" Total Points 6. Pump out 7. Buildings 8. Boat Storage 9. Fixed piers 10. Piles SECTION 4 SUMMARY Sum of Points [A] [B] Maximum Potential Points = [C] = 30 [A] = Resilience Score = Sum of Points/ Maximum Potential Points = [B]/[C] Risk Level (Circle One): Low (0-0.33) Moderate ( ) High ( ) Low Risk Moderate Risk High Risk Page

10 Summary Scoring Table Section Score Risk Level 1. Environmental 2. Infrastructure 3. Operational 4. Future What Does Your Score Mean? Environmental Score Score Range/ What it means: Risk Level: Low Risk Level Moderate Risk Level High Risk Level Natural shelter, limited fetch, and/or higher ground help protect the marina property, resulting in a low environmental risk score. These factors are out of the control of the marina owner, however can have considerable implications for reducing risk. You may have some natural shelter, however you are still susceptible to large storm surges and flooding. Placement of critical facilities is imperative to ensure minimal damage and downtime after a storm event. There is little to no natural shelter or you may be located on low-lying land. A large fetch may also contribute to this high risk score. In addition to placing facilities inland as much as possible, adaptation methods may be necessary to minimize risk at your facility. Elevating structures and utilities is an example of adaptation methods commonly used. Infrastructure Score Score Range/ What is means: Risk Level Even if your environmental score was moderate/high, your infrastructure is placed Low Risk well to minimize the risk to your facility. Setting buildings back and elevating Moderate Risk High Risk utilities are good practices that may have helped reduce your risk. If your environmental score was low, the placement of your structures can cause a moderate/high infrastructure risk score. Setting critical facilities furthest inland or on the highest ground can help reduce risk. Elevating structures and utilities can also help to minimize risk and damage from storms. Your facilities are in danger of inundation and wind damage. If your environmental score was low/moderate, the placement of your structures may be the reason for the high infrastructure score. Setting critical facilities furthest inland or on the highest ground can help reduce risk. Elevating utilities and structures can help minimize risk. In additional, designing structures to a high building standard and with consideration for future sea level rise with help reduce risk from future storm event. Page 10

11 Operational Score This section provides you with some good practices that have been successful at various marinas around the country. Improving planning and implementing these best practices can drastically change the impacts a storm may have on your facility. Improving business continuity will help speed up recovery time and minimize lost revenue. If you receive a low score in this section, simply address the issue with your planning and procedures to become more resilient towards the hazards identified in this assessment. Future Score Score Range/ Risk Level Low Risk Moderate Risk High Risk What it means: The future does not present many new risks to your facility. Sea level rise does not appear to pose substantial risks. This may be due to your elevation above sea level or due to good practices. Elevated utilities and other critical infrastructure may contribute to this low risk score. Incorporating sea level rise puts additional stress on your facility. You may have some good practices in place, however parts of your facility are still vulnerable. Identifying these impacted areas allows you to retrofit if necessary to keep critical infrastructure out of the impacted zones. Sea level rise poses great threats to your facility. You may be located very low or your infrastructure may be located in particularly vulnerable areas. Relocating structures out of the projected inundation areas either by retreat or elevating will help to reduce your risk level. Page 11

12 Tips on Using STORMTOOLS: Easily switch between storm scenarios by clicking the tables at the top of the map! TIPS for Using STORMTOOLS Maps Click any point on land in the flooded region to discover the depth of the water at that point! Find your location by typing your address in our address locator! Page 12