RIO VERDE RIO VERDE AREA DRAINAGEAREA DRAINAGEMASTER PLANMASTER PLAN

Felicia Terry, P.E.Felicia Terry, P.E.Project ManagerProject Manager

Flood Control District of Maricopa CountyFlood Control District of Maricopa County

Area PhotographsArea Photographs

Area PhotographsArea Photographs

Area PhotographsArea Photographs

West County West County FloodingFlooding

West County West County FloodingFlooding

Mission StatementMission Statement

The mission of the Flood Control The mission of the Flood Control District of Maricopa County is to District of Maricopa County is to

provide flood hazard identification, provide flood hazard identification, regulation, remediation, and regulation, remediation, and

education to the residents of Maricopa education to the residents of Maricopa County, to reduce their risks of injury, County, to reduce their risks of injury, death, and property damage due to death, and property damage due to

flooding while allowing them to enjoy flooding while allowing them to enjoy the natural and beneficial values the natural and beneficial values

provided by floodplains. provided by floodplains.

Area DrainageArea DrainageMaster PlansMaster Plans

(ADMP)(ADMP) Provides flood control management Provides flood control management

recommendations that mitigate identified recommendations that mitigate identified flood and erosion hazards.flood and erosion hazards.

How is an ADMP Developed?How is an ADMP Developed? Data CollectionData Collection Alternatives formulation and evaluationAlternatives formulation and evaluation Public InvolvementPublic Involvement Recommended AlternativeRecommended Alternative

Implementation ProcessImplementation Process PrioritizePrioritize Design/ConstructionDesign/Construction FundingFunding

Project HistoryProject History

Rio Verde North Extension

Rio Verde South Extension

Rio Verde North

Rio Verde South

Rio Verde Study AreaRio Verde Study Area 

Project ScheduleProject Schedule

May

May

May

May

May

May

July

July

July

July

Septe

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Septe

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Septe

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Septe

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Novem

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Novem

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Novem

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Janu

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Janu

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Janu

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Janu

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Marc

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Marc

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Data Collection, Analysis & ReviewData Collection, Analysis & Review

Alternative Formulation & EvaluationAlternative Formulation & Evaluation

Plan ImplementationPlan Implementation

Public InvolvementPublic Involvement

20022002 20032003 20042004

RIO VERDE RIO VERDE FLOODINGFLOODING

Brian Fry, P.E.Brian Fry, P.E.Consultant Project ManagerConsultant Project Manager

Dibble & AssociatesDibble & Associates

RainfallRainfall

Approximate Rainfall Totals in inches Approximate Rainfall Totals in inches for Rio Verde Areafor Rio Verde Area

FrequencyFrequency 2-year2-year 10-year10-year 100-year100-year

6-hour6-hour 1.6 1.6 2.32.3 3.43.424-hour24-hour 1.91.9 3.03.0 4.64.6

Values based on NOAA AtlasValues based on NOAA Atlas100-year/24 hour National Standard: FEMA, NFIP100-year/24 hour National Standard: FEMA, NFIP

July 14 RainfallJuly 14 Rainfall(2-yr., 1-hr storm)(2-yr., 1-hr storm)

Tributary Drainage Tributary Drainage

Distributary Drainage Distributary Drainage

Unique Conditions Unique Conditions in Rio Verde Areain Rio Verde Area

Steep SlopesSteep Slopes

Fine-grained SedimentsFine-grained Sediments

Distributary Stream NetworksDistributary Stream Networks

Shallow Sheet FloodingShallow Sheet Flooding

Lateral Erosion & GullyingLateral Erosion & Gullying

Natural Debris Diversions & Flow Natural Debris Diversions & Flow SplitsSplits

Management ToolsManagement Tools

DEVELOPMENT GUIDELINESDEVELOPMENT GUIDELINESThe intent of the Development Guidelines is to mitigate or The intent of the Development Guidelines is to mitigate or minimize flooding impacts due to urbanization of a minimize flooding impacts due to urbanization of a watershed.watershed.

STRUCTURAL ALTERNATIVESSTRUCTURAL ALTERNATIVESA structural alternative is the construction of flood control A structural alternative is the construction of flood control structures such as dams, concrete channels, levees, etc. structures such as dams, concrete channels, levees, etc. to control flood waters of large rivers / washes.to control flood waters of large rivers / washes.

FLOODPLAIN DELINEATIONSFLOODPLAIN DELINEATIONSFloodplain delineations show the limits and sometimes Floodplain delineations show the limits and sometimes the water surface elevation of areas that are susceptible the water surface elevation of areas that are susceptible to inundation by a base flood / 100-year flood / 1% annual to inundation by a base flood / 100-year flood / 1% annual chance flood.chance flood.

PUBLIC PUBLIC INVOLVEMENTINVOLVEMENT

Felicia Terry, P.E.Felicia Terry, P.E.Project ManagerProject Manager

Flood Control District of Maricopa CountyFlood Control District of Maricopa County

Public InvolvementPublic Involvement

3,000 Brochures and Surveys mailed to the 3,000 Brochures and Surveys mailed to the communitycommunity

Public Meetings will be held throughout the projectPublic Meetings will be held throughout the project

Project Website – www.fcd.maricopa.govProject Website – www.fcd.maricopa.gov

Advertising and Articles will continue in local mediaAdvertising and Articles will continue in local media

Work GroupWork Group

Public invited to express ideas and insights. Public invited to express ideas and insights. We invite you to get involved in the problem We invite you to get involved in the problem solving process and to create a community solving process and to create a community based solution.based solution.

Work Group Members Work Group Members

Shirl AndersonShirl Anderson

Alan BurgessAlan Burgess

Fred FleetFred Fleet

Matt HolmMatt Holm

Richard Hollabaugh Richard Hollabaugh

Gary Lane Gary Lane

Bren Riesinger Bren Riesinger

John Shy John Shy

Bob Thomas Bob Thomas

Susan TroenSusan Troen

QuestionsQuestions

Felicia Terry, P.E.Felicia Terry, P.E.Project ManagerProject Manager

Flood Control District of Maricopa CountyFlood Control District of Maricopa County