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FLOOD RESILIENCEA Basic Guide for Water and Wastewater UtilitiesSelect a menu option below.First time users should start with the Overview.

FLOOD RESILIENCEA Basic Guide for Water andWastewater UtilitiesSeptember 2014EPA 817-B-14-006

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesOverview (page 1 of 3)FLOODS AND UTILITIES1Flooding is one of the most common hazards in theUnited States, causing more damage than any othersevere weather-related event. It can occur from tropicalstorms, hurricanes, swollen rivers, heavy rains, tidalsurges, spring snowmelt, levee or dam failure, localdrainage issues and water distribution main breaks.Impacts to drinking water and wastewater utilities caninclude loss of power, damage to assets and dangerousconditions for personnel. As storms become morefrequent and intense and as sea levels rise, flooding willbe an ongoing challenge for drinking water andwastewater utilities.Click Next to learn more about floodresilience and mitigation.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesOverview (page 2 of 3)WHAT IS FLOOD RESILIENCE AND MITIGATION?For the water sector, “flood resilience” refers to the ability ofwater and wastewater utilities to withstand a flooding event,minimize damage and rapidly recover from disruptions toservice.1 Utilities can build resilience by implementingmitigation measures. A mitigation measure can be anemergency planning activity, equipment modification/upgradeor new capital investment/construction project. Examples ofmitigation measures include:1 Mitigation Success StoryNote: Recent FEMA publications recommend elevatingin Alabamacritical infrastructures above the 500 year flood elevation.This level of protection may be necessary to obtainfederal funding.Emergency response planBarriers around key assetsElevated electrical equipmentEmergency generatorsBolted down chemical tanksDuring major flooding, power outages at theGeneva Water Works resulted in sewer backups.Geneva County received a FEMA HazardMitigation Grant to procure an emergency backupgenerator and fuel tank as well as to elevatecritical motors and blowers. Two years later,Geneva experienced another major flood, but thistime the system was unaffected.Implementing these mitigation measures requires financialinvestment by the utility; however, flood mitigation couldprevent costly damage and enable the utility to provide morereliable service to customers during a disaster. To help pay forflood mitigation measures, a utility can also apply for federaldisaster mitigation funds.1For more information on resilience, see Presidential Policy Directive 21 (accessed August 21, 2014).PreviousMain MenuClick Next to learn more about this Guideand to watch a video on flood resilience.Next

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesOverview (page 3 of 3)1ABOUT THIS GUIDEThe U.S. Environmental Protection Agency (EPA) developedthis guide to help drinking water and wastewater utilitiesbecome more resilient to flooding.1 In the approach, the utilitywould examine the threat of flooding, determine impacts toutility assets and identify cost-effective mitigation options. Thisapproach was successfully tested during a pilot project at asmall drinking water system, the Berwick Water Department(BWD), in Berwick, Maine. Click on the video to learn why andhow BWD assessed their resilience to flooding.This guide is particularly useful for small and medium utilities.It provides easy-to-use worksheets with corresponding videos(based on the Berwick pilot). To increase your resilience toflooding, consider your utility’s priorities and availableresources. Although this guide focuses on flood resilience, thesame approach can be applied to enhancing resilience to otherhazards (e.g., earthquakes, tornadoes).Click on the image to view the video.You have completed the Overview.Click Next to continue to the 4-Step Approach.1For more on EPA’s Water Security tools and resources, visit .PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesApproach to Flood Resilience4-STEP PROCESSThere are four basic steps involved in increasing your utility’s resilience to flooding.11STEP 1STEP 2STEP 3STEP 4Understand theThreat ofFloodingIdentify VulnerableAssets & DetermineConsequencesIdentify &Evaluate MitigationMeasuresDevelop Plan toImplementMitigation MeasuresClick on each step above and: Read the step description Watch the corresponding video Complete a worksheet and fill in accompanying blank tables with your utility dataWORK WITH A TEAMTo help you through this process, work with a team of your partners andstakeholders. This team could include your utility staff (e.g., operators,supervisors, field staff), other partners from local government (e.g., townengineer, public works staff, floodplain managers, emergency responsepersonnel) and state government (e.g., primacy agency staff, hazard mitigationofficers). It will be helpful to hold a kick-off meeting with this team to discussgoals and responsibilities to complete the assessment and implement mitigationmeasures. The four steps should be completed sequentially; however, they do nothave to be completed all at once. Complete the steps as time and resourcespermit.1This basic approach is consistent with other water sector guidelines and standards, including ANSI/AWWA G440-11: EmergencyPreparedness Practices, ANSI/AWWA G430: Security Practices for Operations and Management, AWWA M-19 Emergency Planning forWater Utilities, JAWWA J100-10 Risk and Resilience Management of Water and Wastewater Systems and the Vulnerability SelfAssessment Tool (VSAT).PreviousMain 1MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesApproach to Flood ResilienceSTEP 1STEP 2STEP 3STEP 4Understand theThreat ofFloodingIdentify VulnerableAssets & DetermineConsequencesIdentify &Evaluate MitigationMeasuresDevelop Plan toImplementMitigation MeasuresSTEP 1: UNDERSTAND THE THREAT OF FLOODINGFlooding depends on various factors includingrainfall, topography, river-flow, drainage andtidal-surge. The threat of flooding is based onthe likelihood that such a flooding event willoccur. Learn how the Berwick WaterDepartment (BWD) evaluated their threat offlooding from the video. Also, the FederalEmergency Management Agency (FEMA) is aresource to help you. FEMA produces maps ofa “100-year flood” (a flood event that has aone percent chance of occurring in a givenyear) and a more catastrophic “500-yearflood” (a flood event that has a two tenths of apercent chance of occurring in a given year).Click on the Step 1 worksheet icon below sothat you can document the flooding threatand obtain FEMA Flood Maps.Click on the image to view the video.STEP 1 WorksheetWorksheetClick here to document the threat of flooding to your utility.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 1: Worksheet (page 1 of 2)To better understand the threat of flooding, your utility should first examine historical floodingdata and review Federal Emergency Management Agency (FEMA) Flood Maps. Below areinstructions for evaluating the threat of flooding at your utility.The tables below have sample data. Use the blank tables (double click icon)to input your utility’s data.1.1 Have you reviewed utility records of past flooding events?1YesNoIf no, review how past flooding events have threatened your utility. Use various sources, including utilityrecords, newspapers, websites and hazard mitigation experts, to collect previous flooding data. Enter yourutility’s past flooding information into Table 1.EXAMPLE OF COMPLETED TABLE 1 – PAST FLOODING EVENTSEvent InformationDescription of Damage(e.g., Date, Name, Type*, Flood Elevation)(Operational, Public Health and Economic Impacts)April 2007, “Patriot’s Day Storm,” Nor’easter,238.5 ftCollapsed water storage tank and damage to pump stationsand chemical storage. Operated on backup powergenerator. Boil water notice issued for several days.Financial impacts were roughly 100,000.* Tropical storm, hurricane, spring thaw/snowmelt, levee failure, etc.1.2 What potential sources of flooding could impact your utility?Swollen rivers/streamsFlash floodsLevee/dam failureSpring thawCoastal floodingNon-natural causes (e.g., main breaks)1.3 Have you obtained FEMA Flood Maps?YesNoIf no, go to the Map Service Center to find FEMA Flood Maps, categorized bycommunity. Flood Maps show areas that will be affected by both 100-year and 500year floods. A “100-year flood” is a flood event that has a one percent chance ofoccurring in a given year. A “500-year flood” is a flood event that has a two tenthspercent chance of occurring in a given year. Click on the icon to learn more aboutinterpreting a Flood Map. If your Flood Map is not up to date, talk with your localcommunity planning department or floodplain manager.Guide to InterpretingFEMA Flood Maps1.4 Identify which floodplains your utility systems are located within.Locate your utility systems, such as intake, treatment, distribution, storage tank and pump stations, onyour community’s Flood Map to determine which floodplains they are located within. Summarize yourfindings in Table 2.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 1: Worksheet (page 2 of 2)EXAMPLE OF COMPLETED TABLE 2 - UTILITY SYSTEMS WITHIN FLOODPLAINUtility System100-yearFloodplain500-yearFloodplainFlood ReachesElevation (237 ft)Flood ReachesElevation (240 ft)Intake (235 ft)Treatment (238 ft)Distribution/Collection (237 ft)Storage Tank (252 ft)Pump Stations (238 ft)Note: Changes in climateand land use can affect autility’s flooding threat. Fora more advanced evaluation,EPA’s Climate ResilienceEvaluation and AwarenessTool (CREAT) can providedata on projected changes ofextreme precipitation eventsand sea-level rise by location.1.5 What flooding threat do you want to prepare for?Using your utility’s information from Table 2, decide which flood threat will be the focus for protecting yourutility. Select the flooding level that you would like to address.100-year floodElevation ft500-year floodElevation ftOther:Elevation ft(e.g., add elevation for climate change impacts or freeboard1 forNote: A recent FEMA publication2recommended elevating criticalinfrastructures above the 500-year floodelevation. This level of protection maybe necessary to obtain federal funding.local building requirements)To illustrate how a utility might make this decision, below are three potential options based on thesample data in Table 2 above. Option A: Select 100-year flood. The utility is unwilling to tolerate a one percent probability of aflood that would damage its intake and distribution systems. The utility is not concerned about themore remote possibility of a 500-year flood at this time. Option B: Select 500-year flood. Although the utility will have some impacts from a 100-year flood,the intake and distribution systems are generally well protected. However, the entire facility,including a new expensive treatment system, would be a total loss with a 500-year flood. Option C: Select 100-year flood plus 2 feet. The facility has assets located along the coast andexperienced two floods in the last 5 years that approached this elevation and caused significantdisruption to service.1 Freeboard is a safety factor expressed in feet above a flood level for purposes of floodplain managers.2 “Reducing Flood Effects in Critical Facilities,” FEMA RA2 (accessed August 21, 2014).PreviousYou have completed Step 1. Click Next to continue to Step 2.Next

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesReturn to Step 1 WorksheetInterpreting FEMA Flood Maps (page 1 of 2)FLOOD MAPFlood Map is the common term used to refer to a Flood Insurance Rate Map (FIRM) developed by FEMA. Local andstate governments use these maps to understand the threat of flooding and to devise hazard mitigation plans(including possible projects) to mitigate the effects of flooding in their communities. Flood Maps can be obtainedthrough FEMA’s Map Service Center. To identify your relevant Flood Map, enter the address of your facility orvulnerable asset(s). An example map including legend, index and title box is provided below.LegendEXAMPLE FLOOD MAP – JEFFERSON CITY, MISSOURIPanel NumberCommunity Nameand NumberDepictsWhich AreaIs Shown onMap/PanelDateIndexPreviousTitle BoxMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesReturn to Step 1 WorksheetInterpreting FEMA Flood Maps (page 2 of 2)FLOOD MAPThe figure below presents a close-up view of the Flood Map shown on the previous page. Water and wastewaterutilities can use Flood Maps to determine if their facility locations (e.g., treatment, culverts, water storage) are ina 100-year flood zone, a 500-year flood zone or outside of a 500-year flood zone. Although the format andcontent may differ, information on a Flood Map includes: Common physical features, such as major highways, lakes, railroads and waterways Areas subject to a 100-year flood (one percent annual chance of such flooding), also known as SpecialFlood Hazard Areas (SFHAs) and base flood areas Areas subject to a 500-year flood (two tenths percent annual chance of such flooding) Areas outside of the 500-year flood zone Base flood elevation (BFE) or depths Flood insurance risk zonesTo illustrate how to interpret a Flood Map, a hypothetical water utility building is shown.CLOSE-UP OF EXAMPLE FLOOD MAPOTHER FLOOD AREASAreas of 0.2% annual chance flood; areas of 1%ZONE X annual chance flood with average depths of less than1 foot with drainage areas less than 1 square mile; and areasprotected by levees from 1% annual flood chance.Includes areas in the 500-year floodplainFLOODWAY AREAS IN ZONE AEThe floodway is the channel of a stream plusany adjacent floodplain areas that must be kept free ofencroachment so that the 1% annual chance flood can becarried without substantial increases in flood heights.Missouri RiverHypothetical Water UtilityBuilding located outside ofthe 500-year flood zone.Special Flood Hazard Areas(SFHAs) Subject to inundationby the 1% annual chance of flood.Depicts areas in the 100-year floodplainMore information on how to read a Flood Map can be found ing flood risks/understanding flood maps.jsp.PreviousMain MenuBase Flood Elevationline and value.Next

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesApproach to Flood ResilienceSTEP 1STEP 2STEP 3STEP 4Understand theThreat ofFloodingIdentify VulnerableAssets & DetermineConsequencesIdentify &Evaluate MitigationMeasuresDevelop Plan toImplementMitigation MeasuresSTEP 2: IDENTIFY VULNERABLE ASSETS &DETERMINE CONSEQUENCESOften located in low lying areas, water andwastewater utilities are particularlyvulnerable to flooding. Water and debris caninundate the facility, thereby damagingequipment and structures and causingpower outages. Such impacts can lead tovarious consequences including costlyrepairs, disruptions of services, hazardoussituations for personnel and public healthadvisories. In this step, identify the assetsthat are vulnerable to flooding anddetermine the resulting consequences tothose assets and to overall utilityoperations. Using this information and yourjudgment, determine the assets/operationsthat you will need to protect from flooding.Click on the image to view the video.Click the video to learn how BWD identified vulnerable assets and determined consequences to their utility. Usethe worksheet below to conduct Step 2. It includes a checklist to inspect your utility and determine elevations ofassets/operations. It is important to understand how your drinking water or wastewater utility may be impactedby flooding events so that you can identify appropriate mitigation actions to eliminate or reduce asset damageand prevent service disruptions.STEP 2 WorksheetWorksheetClick here to identify assets that are vulnerable toflooding and determine consequences.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 2: Worksheet (page 1 of 2)To identify which key utility assets/operations are vulnerable to flooding, you should conduct an onsite inspection to locate assets and document elevations. Compare these elevations with the threatelevations in the FEMA Flood Map. The assets/operations that are vulnerable to flooding and thatresult in significant consequences for the utility are candidates for mitigation and protection. Beloware instructions for evaluating vulnerabilities of assets and the resulting consequences at your utility.The tables below have sample data. Use the blank tables (double click icon)to input your utility’s data.22.1 Measure elevations of utility assets to determine vulnerability to flooding.Conduct on-site inspections of your utility system and then determine the elevation for each criticalasset/operation. To assist you, use the On-Site Asset Inspection Form found in the blank tables. Summarizethe elevation data for all assets/operations in the vulnerability columns in Table 3. Write in the asset/operation (column 1)Measure the height of the asset/operation above the floor(column 2)Determine the elevation of the floor (above sea level) usingas-built design drawing or layoutsDetermine asset elevation (column 3) by adding floorelevation and asset height above the floorWrite in flood threat elevation into column 4 (from Step 1.5)Compare asset elevation (column 3) to flood threat elevation(column 4) and determine which assets/operations arevulnerable to flooding (column 5)Tip: During the inspections, consider floodwater entry points. For example,assets/operations below ground maybe vulnerable due to leaks from firstfloor flooding. Although an asset may be locatedwithin a floodplain, it may not bevulnerable to flooding if, for example, itis built on an elevated platform orwithin a bermed area.2.2 Determine consequences based on replacement costs and impacts tofacility operations.Assuming that an asset/operation is flooded, determine the consequences. Estimate replacement costs forassets based on the best available data, vendor costs or Recommended Practices.1 Record this in column 6of Table 3 and characterize impacts to the utility operations in column 7.2.3 Determine priority need for mitigation to improve flood resilience.For each asset/operation, use your judgment to determine thepriority need for mitigation measures. Base your decision onboth the vulnerability of the asset/operation to flooding(column 5) and the consequences for the utility (columns 6 and7) in Table 3. Enter your judgment into column 8.Tip: In the example table, note thatthe automatic transfer switch has ahigh consequence to the utility, but islocated above the flood threatelevation, so the switch ultimatelyhas a low priority for mitigation.1 AACE Recommended Practice 17R-97: Cost Estimating and Budgeting: Class 5 – Process Industry Planning Level estimatehttp://www.aacei.org/non/rps/17R-97.pdf (accessed August 21, 2014).PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 2: Worksheet (page 2 of 2)EXAMPLE OF COMPLETED TABLE 3 – SUMMARY OF VULNERABLE ASSETS, CONSEQUENCES OF FAILURE& PRIORITY FOR MITIGATIONVulnerability1Asset/Operation2Heightof AssetAboveFloor(ft)1Consequences34567Elevationof Asset(ft)2Elevationof acementCosts ( ) forAssetImpact to FacilityOperations from AssetFailureRaw 75240Yes15,000AutomaticTransfer Switch2.5240.5240No5,000Electrical Outlets2.5240.5240No5,000Priority for Mitigation58Low( )Inability to feed raw water tothe process tanks will renderthe facility inoperable.Inability to provide high airpressure will limit theoperation of pneumaticvalves on the treatmentprocess systems. This willrender facility inoperable.If water damaged theAutomatic Transfer Switch,the facility would beinoperable.The outlets for general useare not critical to facilityoperations and they arelocated above the 500-yearflood elevation.1 The distancebetween the floor and the bottom of the utility asset.of the asset elevation of floor (in this example, 238 ft based on design drawing of utility) plus height of asset above floor (column 2).3 In this example, elevation of flood threat for the 500- year flood is 240 ft (obtained from Step 1.5).4 If elevation of flood (column 4) is higher than elevation of asset (column 3), then yes.5 Based on qualitative judgment considering both vulnerability and consequences.2 ElevationPreviousYou have completed Step 2. Click Next to continue to Step 3.NextModerate( )High( )

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesApproach to Flood ResilienceSTEP 1STEP 2STEP 3STEP 4Understand theThreat ofFloodingIdentify VulnerableAssets & DetermineConsequencesIdentify &Evaluate MitigationMeasuresDevelop Plan toImplementMitigation MeasuresSTEP 3: IDENTIFY & EVALUATE MITIGATION MEASURESFirst, identify possible mitigation measures thatcan protect the key vulnerable assets andoperations prioritized in Step 2. Then, evaluatewhich mitigation measures make sense to pursueand implement.A mitigation measure can be any emergencyplanning activity, equipment modification or newcapital construction project. Examples of eachinclude: Emergency procedure to top off waterstorage tanks in advance of flooding. Bolting down chemical tanks andelevating equipment. Constructing flood barriers and installingbackup generators.Click on the image to view the video.Click the video to learn how BWD identified andevaluated appropriate mitigation measures. Clickon the worksheet icon below to conduct Step 3.STEP 3 WorksheetWorksheetClick here to identify and evaluate mitigation measures.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 3: Worksheet(page 1 of 5)To improve your utility’s flood resilience, you should identify and evaluate which mitigationmeasures to pursue based on cost, effectiveness and practicality. It is possible that somemitigation measures could be implemented at little to no cost to your utility. Below areinstructions for evaluating mitigation measures at your utility.The tables below have sample data. Use the blank tables (double click icon)to input your utility’s data.33.1 What are your utility’s requirements to maintain a minimum level of serviceduring a flood?Enter capacities/requirements to maintain a minimum level of service at your utility into Table 4. See belowfor an example of Table 4 completed with sample data. This information may help you choose mitigationmeasures that can sustain your minimum level of service.EXAMPLE OF COMPLETED TABLE 4 –CAPACITIES/REQUIREMENTS TO MAINTAIN A MINIMUM LEVEL OF SERVICESample Asset/OperationFinished WaterCapacity/Requirements3,500 gpdChemical and Fuel500 lbs chlorine/dayElectricityVariesWater Pressure at Treatment Plant60 psiPressure of Booster Pumps80 psiTIP: The level of servicerequired following aflood event may differfrom “normal” demands.3.2 What flood mitigation measures can prevent damage to key assets anddisruptions to critical operations?For assets/operations that have a moderate orhigh priority for mitigation (column 8 in Table 3),you may consider consulting with a team ofoperators, mitigation officers, town engineers,neighboring utilities, vendors, etc., to identifypotential options. Click the icon to help youidentify mitigation measures.TIP: General examplesinclude waterproofing,elevating or upgradingequipment; using floodcontrol methods tomodify runoff andmanaging stormwaterthrough greeninfrastructure.Mitigation OptionsPreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 3: Worksheet (page 2 of 5)3.2 What flood mitigation measures can prevent damage to key assets anddisruptions to critical operations? (cont’d)Populate the first two columns in Table 5 with mitigation measures thatyou propose for each asset/operation. FEMA also provides someguidance for selecting mitigation measures to protect against flooding.1TIP: Consider listing severalpossible mitigation measures fora specific asset or operation (e.g.,multiple rows for oneasset/operation).3.3 Evaluate mitigation measures.Evaluate the mitigation options based on various criteria including effectiveness, practicality and cost.Descriptions of these sample criteria are in Matrix 1. Also, your utility might want to consider otherfactors such as: Availability of funding from federal/state sources,Selecting a mitigation strategy that addresses a group of similar assets/operations (e.g., pumps forraw water and pumps for intake water) orBundles of mitigation measures that can better address a flooding threat (e.g., bundle sandbags andwater-proof doors).For each mitigation measure, use your professional judgment to classify the criteria as low, medium orhigh. In columns 3–5, rate each criterion and, in column 6, write your thoughts in evaluating themitigation option. Finally, in column 7, provide your recommendation. For each mitigation measure,complete columns 3–7 in Table 5.1 Selecting Appropriate Mitigation Measures for Floodprone Structures, FEMA 551 (2007), Section 7-2,Technical Considerations (available at http://www.fema.gov/library/viewRecord.do?id 2737 [accessed August 21, 2014]).PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 3: Worksheet (page 3 of 5)MATRIX 1 – DESCRIPTIONS OF EVALUATION CRITERIAPriority Evaluation CriteriaEffectivenessPracticalityCostThis evaluates the ability of a mitigationThis is a measure of the ease toConsider replacement costs for the asset, up-front costs for themeasure to increase resilience. For the waterimplement the mitigation option. Formitigation measure, operations and maintenance costs as well assector, “flood resilience” refers to the ability ofexample, consider whether theindirect costs such as staff training. Sources of cost estimation includewater and wastewater utilities to withstand amitigation option requires ongoingvendors, trade publications or industry standards. Consider whether theflooding event, minimize damage and rapidlyoperations and maintenance ormitigation measure can be implemented internally or if it requiresrecover from disruptions to service. This can bespecial training or certification.outside contractor assistance. Also, consider calculating net presentmeasured against the requirement for avalue costs and compare the costs of the mitigation measures to theminimum level of service (see Table 4).costs of replacing flood-damaged equipment and the costs of disruptedoperations, as outlined in Table 3.Other Evaluation CriteriaFunding SourcesSingle Mitigation Solution for Groups of AssetsBundle Mitigation StrategiesConsider the likelihood of applying and receiving You may want to consider a mitigation strategy for aSometimes, combinations or bundles of mitigationfederal funding for the mitigation measure. Begroup or bundle of assets/operations that are threatenedmeasures can better address a flooding threat.aware that for FEMA Hazard Mitigation Grants,in the same way. For example, several critical pumpsOften, such bundles can be provided at a loweryou need to use FEMA’s more comprehensive(raw water, backwash and finished water) that are co-cost. For example, you may want to bundleBenefit-Cost Analysis Tool to assess mitigationlocated at similar elevations could be considered a singlesandbags and water-proof doors to providecosts.group of assets that need protection. It may be more costcomplementary reliable protection.effective to protect all the pumps with a retaining wallrather than invest in submersible versions of the pumps.PreviousMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 3: Worksheet (page 4 of 5)EXAMPLE OF COMPLETED TABLE 5 –IDENTIFY & EVALUATE MITIGATION MEASURES FOR POWER SUPPLYMitigation MeasuresEvaluation suresEffectiveness(Low, Med,High)Practicality(Low, Med,High)MediumPower SupplyProcureemergencygeneratorPower SupplyEstablishagreementswith suppliersto fuelgeneratorPower SupplyProcurevehicle toobtain/distribute fuelfor on567Estimated Cost ( )Evaluation of Mitigation igh: 100K; Cost-Benefitanalysis indicated a 7year return oninvestmentSignificant benefit over currentsituation – highly effective. Wouldpropose to bundle the procurement ofa generator and fuel agreements toensure power resilience in floods.FEMA mitigation can fund generatorsso we will plan to apply.YesLow: 5KInitial conversation with vendors lookedpromising. Bundled with generatorprocurement. Influenced by higheffectiveness and low cost.YesMedium: 30K pluscosts for operations &maintenanceStrongly influenced by low practicality.There is no need for fuel truck besideemergencies and it may requirehazmat driver certification. Also, thevendor agreed to stage a fuel vehicle inadvance of hurricanes.NoMain MenuNext

FLOOD RESILIENCE: A Basic Guide for Water and Wastewater UtilitiesWorksheetSTEP 3: Worksheet (page 5 of 5)EXAMPLE OF COMPLETED TABLE 5 –IDENTIFY & EVALUATE MITIGATION MEASURES FOR PUMPSMitigation MeasuresEvaluation suresEffectiveness(Low, Med,High)Practicality(Low, Med,High)MediumPumps (raw,finished,backwash)Replace withsubmersiblepumpsPumps (raw,finished,backwash)Increasecapacity forsump pumpPumps (raw,finished,backwash)Installwatertightdoors and sandbags for

It provides easy -to-use worksheets with corresponding videos (based on the Berwick pilot). To increase your resilience to flooding, consider your utility’s priorities and available resources. Although this guide focuses on flood resilience, the same approach can be applied to enhancing resilience

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