Palos Hills Annex

CHAPTER 83. CITY OF PALOS HILLS ANNEX

83.1 HAZARD MITIGATION PLAN POINT OF CONTACT

Primary Point of Contact Alternate Point of Contact Gerald R. Bennett, Mayor Dave Weakley, Commissioner of Public Works City of Palos Hills City of Palos Hills 10335 Roberts Road 10335 Roberts Road Palos Hills, IL 60465 Palos Hills, IL 60465 Telephone: 708-598-3400 Telephone: 708-598-3400 ext. 1111 Email Address: [email protected] Email Address: [email protected]

83.2 JURISDICTION PROFILE The following is a summary of key information about the jurisdiction and its history:  Date of Incorporation: 1958  Current Population: 17,484 • Population Growth: Based on the 2000 census compared to the 2010 census the overall population of the City of Palos Hills has decreased by 2%. • Location and Description: Palos Hills is a city in Cook County, Illinois, United States. It is a southwest suburb of Chicago located 24 miles southwest of the Chicago Loop. The population was 17,484 at the 2010 census. It is the home of Moraine Valley Community College as well as Amos Alonzo Stagg High School. Adjacent suburbs that border Palos Hills include: Hickory Hills to the north, Palos Park and Palos Heights to the south, and Chicago Ridge to the east. Forest Preserves completely surround the western boundaries of Palos Hills. According to the 2010 census, the city has a total area of 4.29 square miles. • Brief History: The earliest inhabitants to the Palos Hills area were Indians during the Upper Mississippian and early historic periods. Archeological excavations reveal two Indian settlements: the Knoll Spring site near the Palos Hills Police Station and another near 107th Street and Route 45. Indians remained in the area until the 1832 Black Hawk War. The building of the Illinois & Michigan Canal from 1836 to 1848 brought Irish and German immigrants to the area. Farmers tilled the land and decimated the timber supply, sending much of it to Chicago via the canal. The first Roman Catholic community, Sacred Heart Roman Catholic Church, was formed in 1872. Agriculture remained the principal occupation of the area until the 1940s. During World War II, the construction of the Dodge-Chrysler aircraft plant at 75th and Cicero attracted workers to the North Palos area, where they lived in substandard housing. Subsequent development of the factory site generated a demand for more housing, but also fostered disagreement on future growth. Impetus for incorporation originated from annexation threats. Hickory Hills’ annexation of streets in North Palos in order to establish a speed trap led to the formation of the North Palos Community Council in 1957. The council fought street annexations, but ultimately was forced to choose between incorporation or continued annexation threats. In 1958 North Palos voted to incorporate as the city of Palos Hills. Before 1963 city lots in Palos Hills were large, apartments were banned, and minimal services were provided. Thereafter planned growth allowed unit

83-1 Cook County Multi-Jurisdictional Hazard Mitigation Plan; Volume 2: Planning Partner Annexes

subdivisions, leading to a building boom. By 1990 the community was largely middle-class, with strong public elementary and high schools, and Moraine Valley Community College. Descendants of Irish, German, and Polish immigrants constitute 50 percent of the population, with substantial numbers of Italian and Greek descendants. Transportation needs are met by easy accessibility to the Stevenson Expressway and the Route 294 Tollway, as well as by Metra train service in the adjacent suburb of Worth and Palos Heights. The western border of Palos Hills consists of 7,000 acres of the Cook County Forest Preserve. • Climate: Palos Hills, IL, gets 39 inches of rain per year. Snowfall received is 27 inches per year. The number of days with any measurable precipitation is 120. On average, there are 189 sunny days per year in Palos Hills, IL. The July high is around 85 degrees. The January low is 17. Our comfort index, which is based on humidity during the hot months, is a 46 out of 100, where higher is more comfortable. The US average on the comfort index is 44. • Governing Body Format: The mayor is the chief executive while the city council, consisting of ten aldermen elected from five wards, is the legislative body. The Mayor is Gerald R. Bennett. The Clerk is Rudy Mulderink. The Treasurer is Kenneth Nolan. This body of Government will assume the responsibility for the adoption and implementation of this plan. Palos Hills operates 6 departments: GIS Department, Economic Development, Police Department, Public Works Department, Parks and Recreation Department, and Community Resources. • Development Trends: The City of Palos Hills is land locked. Most of our building/development took place in the late 70s through the early 90s. Future development in Palos Hills will consist primarily of residential infill with few opportunities for commercial development. The focus of the City now is to capitalize on what little commercial growth opportunities that is currently available through market demographics and analyses.

83.3 CAPABILITY ASSESSMENT The assessment of the jurisdiction’s legal and regulatory capabilities is presented in Table 83-1. The assessment of the jurisdiction’s fiscal capabilities is presented in Table 83-2. The assessment of the jurisdiction’s administrative and technical capabilities is presented in Table 83-3. Information on the community’s National Flood Insurance Program (NFIP) compliance is presented in Table 83-4. Classifications under various community mitigation programs are presented in Table 83-5.

83-2 CITY OF PALOS HILLS ANNEX

TABLE 83-1. LEGAL AND REGULATORY CAPABILITY

State or Other Local Federal Jurisdictional State Authority Prohibitions Authority Mandated Comments Codes, Ordinances & Requirements Building Code Yes No No Yes Chapter 15.04 Ord. 2008-16 Zonings Yes No No Yes Subdivisions Yes No No No Chapter 16.04 Ord. 41 1959 Stormwater Management Yes No MWRD Yes State regulates industrial activity from Construction sites 1 acre or larger under section 402 CWA. MWRD Public Act 93-1049 2004 Chapter 15.52 Ord. 91-14 1991 Post Disaster Recovery Yes No No No Chapter 2.84 Ord. 89-4&6 1989 Real Estate Disclosure No No Yes Yes (765 ILCS 77/) Residential Real Property Disclosure Act. Growth Management No No No No Site Plan Review Yes No No No Chapter 17.56 Ord. 280 1968 Public Health and Safety No No Yes Yes Cook County Board of Health. Environmental Protection Yes No County No Chapter 15.08 Ord. 2006-15 Planning Documents General or Comprehensive No No No No Master Zoning Map Plan Is the plan equipped to provide linkage to this mitigation plan? No Floodplain or Basin Plan Yes No No No Chapter 17.18 Ord. 280 1968 Stormwater Plan Yes No No No Chapter 15.52 Ord. 91-14 Capital Improvement Plan Yes No No No Short Term General Capital Improvements based on current and future needs. What types of capital facilities does the plan address? Buildings, equipment, pumping station and infrastructure, How often is the plan revised/updated? Annually

83-3 Cook County Multi-Jurisdictional Hazard Mitigation Plan; Volume 2: Planning Partner Annexes

TABLE 83-1. LEGAL AND REGULATORY CAPABILITY

State or Other Local Federal Jurisdictional State Authority Prohibitions Authority Mandated Comments Habitat Conservation Plan Yes No No No Chapter 17-31 Ord. 808 1983 Chapter 15.36 Ord. 2008-9 Economic Development No No Yes Yes The Economic Development Plan Commission is charged with reviewing all economic development related programs and incentives including tax incentives offered through the Cook County 6b program. Master Zoning Map provide guidance Shoreline Management Plan Yes No No No Chapter 15-36 Ord. 2008-9 Response/Recovery Planning Comprehensive Emergency Yes No No No Police – Response to Management Plan Extraordinary Emergency Plan Public Work/Water Emergency Response Plan Fire – Unified Command and Response Plan Emergency Service & Disaster Agency – Unified Emergency and Response Plan Threat and Hazard No No Yes No Cook County DHSEM Preparing Identification and Risk THIRA Assessment Terrorism Plan No No Yes Yes Cook County DHSEM Post-Disaster Recovery No No No No Plan Continuity of Operations No No Yes No Cook County DHSEM Plan Public Health Plans No No Yes No Cook County DPH

83-4 CITY OF PALOS HILLS ANNEX

TABLE 83-2. FISCAL CAPABILITY

Financial Resources Accessible or Eligible to Use? Community Development Block Grants Yes Capital Improvements Project Funding Yes Authority to Levy Taxes for Specific Purposes No. Non-home rule. Referendum required User Fees for Water, Sewer, Gas or Electric Service Capital Improvement Fee on Water Bill Incur Debt through General Obligation Bonds Eligible for 30 million. Referendum required Incur Debt through Special Tax Bonds Non-home rule. Referendum required Incur Debt through Private Activity Bonds None Withhold Public Expenditures in Hazard-Prone Areas Referendum required State Sponsored Grant Programs Yes Development Impact Fees for Homebuyers or Developers No

TABLE 83-3. ADMINISTRATIVE AND TECHNICAL CAPABILITY

Staff/Personnel Resources Available? Department/Agency/Position Planners or engineers with knowledge of land Yes Building Dept. Engineering Consultant development and land management practices Engineers or professionals trained in building or Yes Building Dept., Water Dept., Engineering infrastructure construction practices Consultant Planners or engineers with an understanding of Yes Building Dept., Water Dept., Engineering natural hazards Consultant Staff with training in benefit/cost analysis Yes Engineering Consultant Surveyors Yes Engineering Consultant Personnel skilled or trained in GIS applications Yes In house GIS Staff , Cook County GIS Consortium Scientist familiar with natural hazards in local No Would locate if needed through our Engineer area Consultant Emergency manager Yes Police Chief, Fire Chief, Emergency Service & Disaster Agency Director and Commissioner of Public Works Grant writers No

83-5 Cook County Multi-Jurisdictional Hazard Mitigation Plan; Volume 2: Planning Partner Annexes

TABLE 83-4. NATIONAL FLOOD INSURANCE PROGRAM COMPLIANCE

What department is responsible for floodplain management in your Public Work, Building and jurisdiction? Engineering Depts. Who is your jurisdiction’s floodplain administrator? (department/position) Commissioner of Public Works Are any certified floodplain managers on staff in your jurisdiction? No What is the date of adoption of your flood damage prevention ordinance? Ord. 280 - 1968 When was the most recent Community Assistance Visit or Community 12/11/1996 Assistance Contact? Does your jurisdiction have any outstanding NFIP compliance violations that No need to be addressed? If so, please state what they are. Do your flood hazard maps adequately address the flood risk within your Yes jurisdiction? (If no, please state why) Does your floodplain management staff need any assistance or training to Yes – General overview and support its floodplain management program? If so, what type of update training assistance/training is needed? Does your jurisdiction participate in the Community Rating System (CRS)? If No – we have no interest in so, is your jurisdiction seeking to improve its CRS Classification? If not, is joining your jurisdiction interested in joining the CRS program?

TABLE 83-5. COMMUNITY CLASSIFICATIONS

Participating? Classification Date Classified Community Rating System No N/A N/A Building Code Effectiveness Grading Schedule No N/A N/A Public Protection (ISO) Yes ISO 3 2009 StormReady Yes Gold (countywide) 2014 Tree City USA Yes N/A 1989

83.4 JURISDICTION-SPECIFIC NATURAL HAZARD EVENT HISTORY Table 83-6 lists all past occurrences of natural hazards within the jurisdiction. Repetitive flood loss records are as follows: • Number of FEMA-Identified Repetitive Loss Properties: 3 • Number of FEMA-Identified Severe Repetitive Loss Properties: 0 • Number of Repetitive Flood Loss/Severe Repetitive Loss Properties That Have Been Mitigated: 3

83-6 CITY OF PALOS HILLS ANNEX

TABLE 83-6. NATURAL HAZARD EVENTS

FEMA Disaster # Preliminary Damage Type of Event (if applicable) Date Assessment Severe Thunderstorm, High Winds, Flooding N/A 9/11/2013 $50,000 ID# 9421181 Severe Thunderstorm, Wind, N/A 7/24/2012 $50,000 Flooding Lighting, Minor Flooding N/A 7/19/2012 $50,000 ID# 9323634 Flooding and Lighting N/A 6/9/2011 $55,000 ID# 9313997 Winter Weather N/A 2/1/2011 $75,000 Severe Snow Storm DR-1960 1/31/2011 $50,000 Wind Storm N/A 10/28/2010 $40,000 ID# 9251406 Severe Thunderstorm, Flooding N/A 7/24/2010 $40,000 ID# 9251402 Lighting, Strong Storm, Wind N/A 7/23/2010 $50,000 ID# 9248714 Severe Thunderstorm and Wind N/A 6/18/2010 $40,000 Severe Rain Storm and Flooding N/A 3/7-10/2009 $40,000 ID# 8958077 Winter Storm, Winds and Flooding N/A 12/27/2008 $40,000 ID# 8941832 High Winds N/A 10/26/2008 $40,000 Winter Rain Storm N/A 1/7/2008 $40,000 Severe Thunderstorm, Winds and Flooding N/A 8/30/2007 $40,000 ID# 8811471 Severe Thunderstorm, Winds and N/A 10/02/2006 $4,000,000 Flooding ID# 8807363 N/A 8/10/2006 $10,000 ID# 8807328 N/A 8/2/2006 $10,000 ID# 8815175 Thunderstorm, Winds N/A 4/16/2006 $10,000 Thunderstorm N/A 7/20/2005 $20,000 Severe Snow Storm EM-3134 1/1/1999 $50,000 ID # 54959 Flooding N/A 7/17/1996 $2,000,000

83.5 HAZARD RISK RANKING Table 83-7 presents the ranking of the hazards of concern. Hazard area extent and location maps are included at the end of this chapter. These maps are based on the best available data at the time of the preparation of this plan, and are considered to be adequate for planning purposes.

83.6 HAZARD MITIGATION ACTION PLAN AND EVALUATION OF RECOMMENDED ACTIONS Table 83-8 lists the actions that make up the jurisdiction’s hazard mitigation plan. Table 83-9 identifies the priority for each action. Table 83-10 summarizes the mitigation actions by hazard of concern and the six mitigation types.

83-7 Cook County Multi-Jurisdictional Hazard Mitigation Plan; Volume 2: Planning Partner Annexes

TABLE 83-7. HAZARD RISK RANKING

Rank Hazard Type Risk Rating Score (Probability x Impact) 1 Severe Weather 54 2 Flooding 42 3 Severe Winter Weather 42 4 Tornado 36 5 Earthquake 32 6 Drought 2 7 Dam Failure 0

TABLE 83-8. HAZARD MITIGATION ACTION PLAN MATRIX

Applies to New or Existing Hazards Objectives Lead Estimated Sources of Assets Mitigated Met Agencies Cost Funding Timelinea Action P3.1—Conduct a building code education/land use and severe weather awareness program. With the goal to educate residents about building codes that preserve drainage pattern on private property and education on how to plan and respond to severe weather events. New and All Hazards 1,5,6,13 City of Palos Low Grants and Short term existing Hills General Fund Action P3.2 Improve stormwater drainage capacity through re-routing of the stormwater drainage systems in the flood zone under and east of Roberts Road. New and Flooding 2,8,9,12 County High MWRD, Long term existing County, Grants Action P3.3—Severe weather / warning system. Early warning system to call land line and cell phones to notify residents of approaching severe weather impacts for all severe weather and other urgent community notifications, i.e., water main breaks, water shortage due power outage, road closures, extreme cold, frozen pipes etc. New and All 1, 5, 6, 8, City of Palos Medium Grants and Short term existing Hills General Fund Action P3.4—Increase salt storage. During severe winter weather conditions. Salt becomes scarce due to frozen shipping routes. Additional storage would negate the need for salt usage restrictions and eliminate the use of sand and slag that choke storm sewer drainage systems and water ways. New and Severe Winter 1, 2, 9, 13 City of Palos High Grants and Long Term existing Weather Hills General Fund

83-8 CITY OF PALOS HILLS ANNEX

TABLE 83-8. HAZARD MITIGATION ACTION PLAN MATRIX

Applies to New or Existing Hazards Objectives Lead Estimated Sources of Assets Mitigated Met Agencies Cost Funding Timelinea Action P3.1—Where appropriate, support retrofitting, purchase, or relocation of structures in hazard-prone areas to prevent future structure damage. Give priority to properties with exposure to repetitive losses. Existing All 7, 13 City of Palos High FEMA Long-term Hills Hazard (depending on Mitigation funding) Grants Action P3.2—Continue to support the countywide actions identified in this plan. New and All All City of Palos Low General Fund Short- and existing Hills long-term Action P3.3—Actively participate in the plan maintenance strategy identified in this plan. New and All 3, 4, 6 DHSEM, City Low General Fund Short-term existing of Palos Hills Action P3.4—Consider or maintain participation in incentive-based programs such as Tree City and StormReady. New and All 3, 4, 5, 6, 7, 9, City of Palos Low General Fund Long-term existing 10, 11, 13 Hills Action P3.5—Maintain good standing under the National Flood Insurance Program by implementing programs that meet or exceed the minimum NFIP requirements. Such programs include enforcing an adopted flood damage prevention ordinance, participating in floodplain mapping updates, and providing public assistance and information on floodplain requirements and impacts. New and Flooding 4, 6, 9 City of Palos Low General Fund Short-term existing Hills and ongoing Action P3.6—Where feasible, implement a program to record high water marks following high-water events. New and Flooding, 3, 6, 9 City of Palos Medium General Long-term existing Severe Hills Fund; FEMA Weather Grant Funds (Public Assistance) Action P3.7—Integrate the hazard mitigation plan into other plans, programs, or resources that dictate land use or redevelopment. New and All 3, 4, 6, 10, 13 Palos Hills Low General Fund Short-term existing Building Department a. Ongoing indicates continuation of an action that is already in place. Short-term indicates implementation within five years. Long-term indicates implementation after five years.

83-9 Cook County Multi-Jurisdictional Hazard Mitigation Plan; Volume 2: Planning Partner Annexes

TABLE 83-9. MITIGATION STRATEGY PRIORITY SCHEDULE

# of Do Benefits Is Project Can Project Be Funded Objectives Equal or Grant- Under Existing Action # Met Benefits Costs Exceed Costs? Eligible? Programs/ Budgets? Prioritya 1 4 High Low Yes Yes No Medium 2 5 High High Yes Yes No Medium 3 4 High Medium Yes Yes No Medium 4 4 High High Yes Yes No Medium 5 2 High High Yes Yes No Medium 6 13 Medium Low Yes No Yes High 7 3 Medium Low Yes Yes Yes High 8 9 Medium Low Yes No Yes Medium 9 3 Medium Low Yes No Yes High 10 3 Medium Medium Yes Yes No Medium 11 5 Medium Low Yes No Yes High

a. See Chapter 1 for explanation of priorities.

TABLE 83-10. ANALYSIS OF MITIGATION ACTIONS

Action Addressing Hazard, by Mitigation Typea 3. Public 4. Natural 2. Property Education and Resource 5. Emergency 6. Structural Hazard Type 1. Prevention Protection Awareness Protection Services Projects Dam Failure N/A N/A N/A N/A N/A N/A Drought 6, 7, 11 5 6, 7 N/A 6 N/A Earthquake 6, 7, 11 5 6, 7 N/A 6 N/A Flood 1, 2, 4, 5, 6, 7, 1, 5, 8, 9 1, 3, 6, 7, 8, 9 1, 2, 4, 8, 9 2, 3, 4, 6, 7, 8 2 8, 9, 10, 11 Severe Weather 1, 2, 3, 4, 6, 7, 2, 5 1, 3, 6, 7, 8 1, 2, 4, 8 1, 3, 6, 8 2 8, 10, 11 Severe Winter 4, 6, 7, 8, 10 5 1, 3, 6, 7, 8 4, 8 1, , 3, 4, 6, 8 4 Weather Tornado 6, 7, 8, 11 5 6, 7, 8 N/A 6, 8 N/A

a. See Chapter 1 for explanation of mitigation types.

83-10 CITY OF PALOS HILLS ANNEX

83.7 FUTURE NEEDS TO BETTER UNDERSTAND RISK/ VULNERABILITY No needs have been identified at this time.

83.8 ADDITIONAL COMMENTS No additional comments at this time.

83-11

HAZUS-MH RISK ASSESSMENT RESULTS FOR PALOS HILLS

Cook County Hazard Mitigation Plan; Volume 2—Planning Partner Annexes

PALOS HILLS EXISTING CONDITIONS

2010 Population ...... 17,484 Total Assessed Value of Structures and Contents ...... $2,708,254,573 Area in 100-Year Floodplain ...... 189.81 acres Area in 500-Year Floodplain ...... 359.60 acres Number of Critical Facilities ...... 44

HAZARD EXPOSURE IN PALOS HILLS

% of Total Number Exposed Value Exposed to Hazard Assessed Value Population Buildings Structure Contents Total Exposed Dam Failure Buffalo Creek 0 0 $0 $0 $0 0.00% U. Salt Cr. #2 0 0 $0 $0 $0 0.00% Touhy 0 0 $0 $0 $0 0.00% U. Salt Cr. #3 0 0 $0 $0 $0 0.00% U. Salt Cr. #4 0 0 $0 $0 $0 0.00% Flood 100-Year 215 66 $52,344,050 $45,777,610 $98,121,660 3.62% 500-Year 1,755 540 $188,852,811 $123,853,191 $312,706,002 11.55% Tornado 100-Year — — $237,759,340 $132,838,166 $370,597,506 13.68% 500-Year — — $544,183,986 $396,322,977 $940,506,964 34.73%

ESTIMATED PROPERTY DAMAGE VALUES IN PALOS HILLS

% of Total Estimated Damage Associated with Hazard Assessed Value Building Contents Total Damaged Dam Failure Buffalo Creek $0 $0 $0 0.00% U. Salt Cr. #2 $0 $0 $0 0.00% Touhy $0 $0 $0 0.00% U. Salt Cr. #3 $0 $0 $0 0.00% U. Salt Cr. #4 $0 $0 $0 0.00% Earthquake 1909 Historical Event $46,765,670 $15,078,270 $61,843,940 2.28% Flood 10-Year $227,649 $266,456 $494,105 0.02% 100-Year $2,626,053 $5,816,627 $8,442,680 0.31% 500-Year $14,061,310 $15,023,221 $29,084,531 1.07% Tornado 100-Year $23,775,934 $13,283,817 $37,059,751 1.37% 500-Year $79,450,862 $57,863,155 $137,314,017 5.07%

HAZARD MAPPING FOR PALOS HILLS

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II-III (Weak) S KEAN AVE KEAN S IV (Light)

S ROBERTS RD ROBERTS S V (Moderate) VI (Strong)

VII (Very Strong) S HARLEM AVE HARLEM S VIII (Severe) IX (Violent) W 103RD ST X+ (Extreme)

Event Date of May 26, 1909. Original magnitude of 5.0; increased magnitude for analysis of 6.0. Depth: 10 km. Epicenter Lat/Long: 41.6N 88.1W

S An Epicenter Map is derived from a database

8 of historical earthquakes developed from three

T H «¬7 sources (Composite Earthquake Catalog, A V 2002, Earthquake Data Base, 2002, and E W 107TH ST Earthquake Seismicity Catalog, 1996). The database has been sorted to remove historical earthquakes with magnitudes less than 5.0.

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W H

T Base Map Data Sources:

E Cook County, U.S. Geological Survey

H 111TH ST

W 111TH ST U

S S

S HARLEM AVE

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¨¦§294 National Earthquake Hazard Reduction Program (NEHRP)

Soil Classification S KEAN AVE KEAN S Site Class

A - Hard Rock S ROBERTS RD ROBERTS S B - Rock C - Very Dense Soil, Soft Rock D - Stiff Soil E - Soft Soil F - Site-Specifc Evaluation W 103RD ST

Soil classification data provided by the Illinois State Geological Society.

The procedures outlined in the NEHRP provisions (Building Seismic Safety Council, 2004) and the 2003 International Building

S Codes (International Code Council, 2002)

8 8 were followed to produce the soil site class T H maps. Central U.S. Earthquake Consortium A V (CUSEC) State Geologists used the entire E W 107TH ST column of soil material down to bedrock and

W SOUTHWEST HWY did not include any bedrock in the calculation S HARLEM AVE of the average shear wave velocity for the

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W much of the amplification. H

S Base Map Data Sources:

W Cook County, U.S. Geological Survey

T 111TH ST W 111TH ST U

S S

CALUMET SAG RD ^ «¬83 . CAL-SAG RD

MILL CALUMET SAG CHANNEL CREE 43 K «¬ 0 0.25 0.5 Miles ¤£12 W 95TH ST CITY OF PALOS HILLS ¨¦§294 FEMA DFIRM Flood Hazard Areas

Floodway 1 Percent Annual Flood Hazard S KEAN AVE KEAN S Flood Depth 20 ft

-1 ft S HARLEM AVE HARLEM S Flood hazard areas as depicted on FEMA Digital Flood Insurance Rate Maps (DFIRM). W 103RD ST The 1 percent annual flood hazard is commonly referred to as the 100 year floodplain.

T S ROBERTS RD ROBERTS S

A V E W 107TH ST

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W H

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W 111TH ST U

S S

S HARLEM AVE

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¨¦§294 Liquefaction Susceptibility Susceptible Not Susceptible High Bedrock

S KEAN AVE KEAN S Moderate to High Peat Moderate Water

S ROBERTS RD ROBERTS S Low to Moderate Ice Low

S HARLEM AVE HARLEM S Very Low to Low Very Low

W 103RD ST

Liquefaction data provided by the Illinois State Geological Society. Liquefaction data based on the Youd and Perkins (1978) method.

A liquefaction susceptibility map provides an estimate of the likelihood that soil will liquefy S as a result of earthquake shaking. This type of

T map depicts the relative susceptibility in a

H 7 «¬ range that varies from very low to high. Areas A V E W 107TH ST underlain by bedrock or peat are mapped separately as these earth materials are not liquefiable, although peat deposits may be subject to permanent ground deformation

LUCAS DITCH LUCAS STON W SOUTHWEST HWY Y CREEK caused by earthquake shaking.

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W 111TH ST U

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S HARLEM AVE

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¨¦§294 100- and 500-Year Tornado Events

100-Year Modeled Tornado Event (F4)

S ROBERTS RD ROBERTS S 500-Year Modeled Tornado Event (F5)

W 103RD ST

The 100- and 500-year events have been modeled based on fifty-nine years of tornado data for Cook County. The wind speeds, widths, lengths, and direction for each event

8 were developed using existing historical

H tornado data. The simulated storms and their

A corresponding losses within this jurisdiction V E W 107TH ST were used to determine the 100- and 500-year economic loss event. «¬7 LUCAS DITCH LUCAS STON Y CREEK

W H

S Base Map Data Sources:

W Cook County, U.S. Geological Survey

W 111TH ST S S

S HARLEM AVE

^ CALUMET SAG RD «¬83 .

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