October 28, 2020 - Maricopa

October 28, 2020

WelcomeFlood Control Advisory Board

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Agenda

• Call to Order• Approval of the September 23, 2020, FCAB Meeting Minutes• Election of Officers• Appointment of FCAB Standing Committees• IGA for 19th Avenue and Dobbins Road Flood Mitigation Project• 2020 Comprehensive Report and Program Update• Flood Warning Program Report• Cave Buttes Dam Modification Project Update• Comments from the Director• Summary of Recent Actions by the Board of Directors• Other Business and Comments from the Public

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Approval of Minutes September 23, 2020

DeWayne Justice

Chairman

Agenda Item #2Action Item3

Election of Officers

Michael Fulton

Director


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Action Item

Staff recommends that the Flood Control Advisory Board elect officers as nominated for the period November 2020 to October 2021 based on the slate recommended by staff or to open the nominations for officers.

ELECTION OF OFFICERS

• Chairman – Dick Schaner

• Vice Chairman – Gregg Monger

• Secretary – Hemant Patel

Agenda Item #3Action Item 6

Action Requested

STAFF RECOMMENDS THE FOLLOWING ACTION: It ismoved that the Flood Control Advisory Board electofficers as nominated for the period of November 2020to October 2021.

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Appointment of FCAB Standing Committees

Michael Fulton

Director


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Action Item

Staff recommends that the Flood Control Advisory Board appoint members to the Flood Control Advisory Board Standing Committees.

Appointment of FCABStanding Committees

• Dick Schaner

• DeWayne Justice

• Kyle Tilghman

• Hemant Patel

• Ray Dovalina

• Ray Dovalina

• Kyle Tilghman• Dick Schaner

• DeWayne Justice

Legislative Committee

Policy Committee

Program & Budget

Committee

Public Information Committee

Agenda Item #4Action Item 10

Action Requested

STAFF RECOMMENDS THE FOLLOWING ACTION: It ismoved that the Flood Control Advisory Board approvethe appointment of members to the Flood ControlAdvisory Board Standing Committees for November 2020to October 2021 as recommended.

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19th Avenue and Dobbins Road Storm Drain ProjectIGA 2019A010

Nazar Nabaty, P. E.Project Manager

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Agenda Item #5Action Item

Action Item

Staff recommends that the Flood Control AdvisoryBoard endorse and recommend that the Board ofDirectors of the Flood Control District of MaricopaCounty adopt IGA FCD 2019A010 between theDistrict and the City of Phoenix for the design, right-of-way acquisitions, utility relocations, construction,and construction management of the 19th Avenueand Dobbins Road Storm Drain Project.

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Background:Laveen Watershed Area Drainage Master Plan/Study

(ADMS/P Update Study Area)

• Approximately 37 square miles

• Salt River to north, South Mountain to south, approximately 7th Avenue alignment to east, Gila River Indian Community to the west

• Urban and rural areas

• Phoenix, and Unincorporated Maricopa County

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Gila River Indian

Community

ADMS/P Update Study Area

• Area study started late 2015 and completed in December 2017

• Recommended drainage master plan

• To be designed and constructed as different elements of the recommended plan

• Shared cost recommended projects totaled approximately $29M

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ADMS/P Update Study Area

Recommended Plans

• Area 1(red): Hidden Valley

• Area 2 (green): 51st Avenue and Sunrise

• Area 3 (purple): 35th Avenue and Olney

• Area 4 (blue): 27th Avenue and Olney

• Area 5 (yellow): 19th Avenue and Dobbins

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19th Avenue and Dobbins Road Storm Drain Project Features

• 9,250 feet of storm drain along Dobbins Road, 19th

Avenue and South Mountain Avenue to Regional Basin

• Dobbins Basin

• Laterals, catch basins curbing and pavement

• Landscaping and LID features

• Estimated cost $6.5M

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FLO-2D View - Before and After

Before After

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Dobbins Avenue View – Before and After

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Before After

Project Benefits

• Minimize residential and business flooding risks including:o Arizona Humane Society facility

o City of Phoenix Fire station

• Minimize historical flooding along Dobbins Road

• Provide a 100-yr level flooding protection to Laveen residentswithin the project limits

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IGA Provisions• Estimated cost for design, utility relocations, rights-of-

way acquisitions, construction, and constructionmanagement = $6.5M

• 50/50 cost-share, the District and City of Phoenix

• District is the lead agency for the Project

• City of Phoenix to own, operate and maintaincompleted Project

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Authorizations

• March 15, 2018 - Resolution FCD 2018R006 authorized the District to develop IGA’s, CIP funding, design, land acquisition, and construction

• March 17, 2018 - (Ordinance S-44315) the City of Phoenix Council authorization for the City Manager, or his designee, to enter into an Intergovernmental Agreement (IGA) with the District

• The Project submitted by City of Phoenix for the CIPPP process and recommended

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Action Requested

STAFF RECOMMENDS THE FOLLOWING ACTION: It ismoved that the Flood Control Advisory Board endorsesand recommends that the Board of Directors of the FloodControl District of Maricopa County approve IGA FCD2019A010 for the 19th Avenue and Dobbins Road StormDrain Project.

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QUESTIONS?

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Comprehensive Report and Program:2020 Update

Michael Fulton

Director


Action Item

Staff recommends that the Flood Control AdvisoryBoard endorse the Comprehensive Report andProgram: 2020 Update and recommend that theBoard of Directors of the Flood Control District ofMaricopa County adopt it.

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Comprehensive Report and Program: 2020 Update

Required by A.R.S. §48-3616

Each Flood Control District in Arizona has created (and every

five years must update) this report that addresses:

• A survey of the flood control problems of the district,

• A description of existing flood control facilities in the area,

• Recommendations as to cooperation between the district and the owner or

owners of existing facilities,

• Recommendations and a preliminary plan for the construction or other

acquisition of facilities to carry out the purpose of the district, and a

description of the property proposed to be acquired or damaged in

performing the work,

• A program for carrying out the regulatory functions,

• A map showing the district boundaries and location of the work proposed to be done and property taken or damaged,

• An estimate of the cost of the proposed work and such other things as the board of directors may request.

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2020 Update continued…

Survey of flood control problems included descriptions of:

• Geographic scope of the District

• Storm Events and Frequency

• Types of flooding (riverine, alluvial fan for example)

• The functions of natural floodplains

• Floodplain development within the District, Flood History and Repetitive Loss Areas

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Descriptions of existing flood control facilities and programs

Large (Regional) flood control facilities: location and purpose

Programs• Flood Hazard Identification• Floodplain Management (Permits and Enforcement)• Capital Improvement Program• Small Projects Assistance Program• Floodprone Property Assistance Program• Dam and Levee Safety Programs• Operations and Maintenance• Flood Warning and Emergency Action Planning

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Recommendations to continue:

Cooperation with the Army Corps of Engineers and the Natural Resources

Conservation Service to fund major maintenance and rehabilitation of

federally built facilities;

Coordination with the Federal Emergency Management Agency to

maintain Flood Insurance Rate Maps and develop tools to more accurately

predict flood risk;

Collaboration with State of Arizona partners (ADWR, ADOT) to manage

and build mutually beneficial flood control projects;

Work with towns of the District to partner in the construction of new

facilities + development of emergency action plans;

Pursuit of grant funding opportunities where appropriate to support

District programs.


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Cost of proposed work and funding:

Revenue is primarily from secondary property taxes

Expenditures are generally categorized in Operating, Capital Projects,

Major Maintenance, SPAP, FPAP and other Non-Recurring Projects.

Report contains FY20 financial numbers as reference point

5-Year Capital Improvement Program (including capital projects, SPAP,

FPAP, Major Maintenance and other significant projects) is presented to

the Board of Directors each year

https://www.maricopa.gov/3668/Budget-Documents

https://www.maricopa.gov/3668/Budget-Documents

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Draft Report may be found at: https://www.maricopa.gov/DocumentCenter/View/63496/2020-

Comprehensive-Plan-Final-Draft-Updated-102320

https://www.maricopa.gov/DocumentCenter/View/63496/2020-Comprehensive-Plan-Final-Draft-Updated-102320

Action Requested

STAFF RECOMMENDS THE FOLLOWING ACTION: It ismoved that the Flood Control Advisory Board endorsesthe Comprehensive Report and Program: 2020 Updateand recommends that the Board of Directors of the FloodControl District of Maricopa County adopt it.

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QUESTIONS?

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Flood Warning Program Report

Steve Waters

Flood Warning Branch Manager

Information Item Agenda Item #736

For Today…

• Report Purpose

• Program Mission

• Program History

• Present-day Program

• Budget History and Staffing

• Comparison to Similar Programs

• Program Future

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Report Purpose

• One of several District programs for which a detailed report was or will be requested by Management

• Provides a complete overview for incoming Management and Board Members

• Published on our internet page for viewing by the media and the public

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Program Mission

• Maricopa County Mission:

o … to provide regional leadership… and necessary public services so that residents can enjoy… a safe community.

• The Flood Control District of Maricopa County (District) Mission:

o … to reduce the risk of flooding so that property damage and loss of life are minimized…

• The Flood Warning Program (FWP) Mission:

o To provide real-time and historic flood-related information to agencies and the public to protect lives, property and flood control structures.

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Program History

• 1978-80 floods on major rivers and flood control structures indicated the need for real-time hydrologic information.

• County Hydrologist Les Bond (1978) “the county must consider the potential for liability for damages and the present inadequate rainfall data upon which we base our hydrology for flood control structures.”

• Automated Local Evaluation in Real Time (ALERT) technology was being developed in central California at this time.

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Program History (cont.)

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Present-Day Program

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Present-Day Program (cont.)

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Present-Day Program (cont.)

• Planning

• Detection

• Communication

• Actions

• Maintenance

• Exercises

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Staffing

• Branch Manager

• Senior Hydrologist

• Meteorologist

• FWP Specialist

• Water Technician Supervisor

• Water Technicians (4)

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Budget History

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Comparison to Similar Programs

• Maricopa County has the largest jurisdiction in area, and a square miles to rain gage ratio of 34. Houston and Denver are 17 and 11 respectively, or approximately twice the density.

• Staff sizes for Maricopa County, Houston and Denver are very similar, but FWP maintains more than twice as many rain gages over an area five times larger.

• Costs to install a single automated rain gage are similar across agencies, with the exception of Denver’s $3,000 labor cost which is attributed to contract pricing.

• Only two of the four agencies use established Flood Response and Emergency Action Plans.

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Flood Warning in the Future

• Electronic parts will become faster, smaller and cheaper

• Increased use of video monitoring

• Doppler RADAR used to measure surface water velocity

• Better rainfall intensity estimates from weather RADAR

• Computing and data storage in the Cloud

• ALERT stations evolve into a wireless local area network (LAN)

• 3-dimensional maps of storms and flooding

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QUESTIONS ?

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Cave Buttes Dam Modification ProjectAuxiliary Outlet Tunnel – Construction Update

Steve Brown, P.E.

Sr. Geotechnical Engineer, Dam Safety Branch

Information Item Agenda Item #850

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Outline

• Brief Project Summary

• Construction Update

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District Dams Vicinity Map

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Cave Buttes Dam Impoundment - 2010

• Goal to reduce drawdown time from ~55 days to ~30 days

Why we are modifying the dam…• Existing outlet is a single 45” diameter conduit (relatively low outlet capacity)

• The dam has never experienced a full reservoir (still untested)

RISK REDUCTION

• There are no signs that would indicate a risk of imminent dam failure, but there are seepage concerns at the dam which warrant risk reduction measures

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• Clear seepage has been observed during previous large impoundments.

Note: A future Phase 2 is planned which would install a seepage collection system to further reduce the project risk.

Cave Buttes Dam Modification Project Design Elements

• New 60-inch diameter steel-lined auxiliary tunnel outlet

Auxiliary outlet operated to stay within current 100-yr floodplain

Ancillary Features

• Intake tower with hydraulic gate

• Outlet structure

• Gate House

• Inlet/Outlet Channels

• New stream flow gauge downstream55

Cave Buttes Dam

Dike #2

Site Map

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Project Location

Design

Tunnel972 ft.

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Intake Structure

Outlet Structure

Construction Update

• CMAR: Coffman/SSC Joint Venture

• $14.5M Construction Contract

• NTP December 12th, 2019

• Start of Tunneling April 8th, 2020

• Tunnel Daylighting September 8th, 2020

• Completion Spring 2021

CURRENTLY ON SCHEDULE with NO COST INCREASES

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Tunnel Machine Delivery 4/6/2020

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Operation from above

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Tunnel Machine Launch Day 4/8/2020

Tunnel Machine Operator Inside

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Hard Rock Tunnel FaceInside the Tunnel

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Tunnel Machine Daylighting 9/8/2020

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Tunnel Machine Daylighting 9/8/2020

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Remaining Work

• Tunnel Grouting

• Intake and Outlet Structures

• Inlet and Outlet Channels

• Gate House

• Access Roads

• Site Restoration

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QUESTIONS?

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Comments from the Director

Michael FultonDirector

Agenda Item #967

Summary of Recent Actions

by the Board of Directors

Jack Sellers

District 1

Vice

Chairman

Steve Chucri

District 2

Bill Gates

District 3

Clint Hickman

District 4

Chairman

Steve GallardoDistrict 5

Agenda Item #1068

Other Business and

Comments from the Public

Agenda Item #1169

Thank youFlood Control Advisory Board

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October 28, 2020 - Maricopa

Documents

Transcript of October 28, 2020 - Maricopa