Glendale (PDF) - Hazard Mitigation Web Portal - State of California

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Natural Hazards Mitigation PlanCity of Glendale, CaliforniaSection 8 – Floodsvulnerability assessments of flooding hazards involve assessing the amount of property in thefloodplain, as well as the type and value of structures on those properties. Once that is done,then a working estimate for potential flood losses can be calculated. The HAZUS software has acomponent to estimate losses due to flooding. Input to the program can include FEMA floodinundation zones, or site-specific engineering studies of flood potential prepared by othersrather than FEMA. Since there are no FEMA maps available for Glendale, nor are there morerecent and city-specific studies that identify potential flooding areas, this loss estimationanalysis was not conducted for this report. Should data be developed in the future to more fullymap this hazard, loss estimation analyses based on that mapping can then be conducted.Community Flood Issues:What is Susceptible to Damage During a Flood Event?The largest impact on communities from flood events is the loss of life and property. Duringcertain years, property losses resulting from flood damage are extensive. Property loss fromfloods strikes both private and public property. Although there has been no significant floodingin Glendale since at least 1969, as described above, localized flooding does occur sporadically.Furthermore, storm damage in the form of drips into structures, amounting to considerableamount of money in the form of repairs, have been reported as recently as with the storms of2005.Property Loss Resulting from Flooding Events: The type of property damage caused byflood events depends on the depth and velocity of the floodwaters. Faster moving floodwaterscan wash buildings off their foundations and sweep cars downstream. Pipelines, bridges, andother infrastructure can be damaged when high waters combine with flood debris. Extensivedamage can be caused by basement flooding and landslide damage related to soil saturationfrom flood events. Most flood damage is caused by water saturating materials susceptible to loss(i.e., wood, insulation, wallboard, fabric, furnishings, floor coverings, and appliances). In manycases, flood damage to homes renders them unlivable.Risk Analysis:Risk analysis is the third and most advanced phase of a hazard assessment. It builds upon thehazard identification and vulnerability assessment. A flood risk analysis for the city of Glendaleshould include two components: 1) the life and value of property that may incur losses from aflood event (defined through the vulnerability assessment); and 2) the number and type of floodevents expected to occur over time. Within the broad components of a risk analysis, it ispossible to predict the severity of damage from a range of events. Flow velocity models canassist in predicting the amount of damage expected from different magnitudes of flood events.The data used to develop these models is based on hydrological analysis of landscape features.Changes in the landscape, often associated with human development, can alter the flow velocityand the severity of damage that can be expected from a flood event. Using GIS technology andflow velocity models, it is possible to map the damage that can be expected from flood eventsover time. It is also possible to pinpoint the effects of certain flood events on individualproperties. At the time of publication of this Plan, data was insufficient to conduct a riskanalysis for flood events in the city of Glendale.However, the current mapping projects will result in better data that will assist inunderstanding risk. This Plan includes recommendations for building partnerships that willsupport the development of a flood risk analysis in the City of GlendaleManufactured Homes:Statewide, the 1996 floods destroyed 156 housing units. Of those units, 61 percent were mobile2006 PAGE 8- 21
Natural Hazards Mitigation PlanCity of Glendale, CaliforniaSection 8 – Floodshomes and trailers. Many older manufactured home parks are located in floodplain or low-lyingareas. Manufactured homes have a lower level of structural stability than stick-built homes, andmust be anchored to provide additional structural stability during flood events (and forearthquake preparedness, also). Because of confusion in the late 1980s resulting from multiplechanges in NFIP regulations, there are some communities that do not actively enforceanchoring requirements.Business/Industry:Storm-flooding events impact businesses by damaging property and by interrupting business.Flood events can cut off customer access to a business as well as close a business for repairs.Roof leaks can impact the contents; in extreme cases, leaks can cause damage to sensitiveelectrical equipment, with the potential to cause the affected business thousands of dollars inmaterial losses and potential loss of revenue. A quick response to the needs of businessesaffected by flood events can help a community maintain economic vitality in the face of flooddamage. Responses to business damages can include funding to assist owners in elevating orrelocating flood-prone business structures, and loans to make building improvements, such asnew roofs.Public Infrastructure:Publicly owned facilities are a key component of daily life for all citizens of Los Angeles County,including Glendale residents. Damage to public water and sewer systems, transportationnetworks, flood control facilities, emergency facilities, and offices can hinder the ability of thegovernment to deliver services. Government can take action to reduce risk to publicinfrastructure from flood events, as well as craft public policy that reduces risk to privateproperty from flood events.Roads:During natural hazard events, or any type of emergency or disaster, dependable roadconnections are critical for providing emergency services. Roads systems in the city of Glendaleare maintained by multiple jurisdictions. Federal, State, county, and city governments all have astake in protecting roads from flood damage. Road networks often traverse floodplains andfloodway areas. Transportation agencies responsible for road maintenance are typically awareof roads at risk from flooding.Bridges:Bridges are key points of concern during flood events because they are important links in roadnetworks, river crossings, and they can be obstructions in watercourses, inhibiting the flow ofwater during flood events. Scour at highway bridges involves sediment-transport and erosionprocesses that cause streambed material to be removed from the bridge vicinity. Nationwide,several catastrophic collapses of highway and railroad bridges have occurred due to scouringand a subsequent loss of support of foundations. This has led to a nationwide inventory andevaluation of bridges (Richardson and others, 1993).Scour processes are generally classified into separate components, including pier scour,abutment scour, and contraction scour. Pier scour occurs when flow impinges against theupstream side of the pier, forcing the flow in a downward direction and causing scour of thestreambed adjacent to the pier. Abutment scour happens when flow impinges against theabutment, causing the flow to change direction and mix with adjacent main-channel flow,resulting in scouring forces near the abutment toe. Contraction scour occurs when flood-plainflow is forced back through a narrower opening at the bridge, where an increase in velocity canproduce scour. Total scour for a particular site is the combined effects from all threecomponents. Scour can occur within the main channel, on the flood plain, or both. Whiledifferent materials scour at different rates, the ultimate scour attained for different materials is2006 PAGE 8- 22
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NOTES:This map is intended for gene
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City of GlendaleUpdateHazard Mitiga
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Similar to Safety ElementIncludesEa
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HospitalsPartnershipsWithin City an
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Impact on CityMost significant area
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