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AGENDA
STORMWATER UTILITY COMMISSION
REGULAR SESSION
JUNE 16, 2022
HOPI CONFERENCE ROOM
11000 N. LA CAÑADA DRIVE
REGULAR SESSION AT OR AFTER 4:00 PM
CALL TO ORDER
ROLL CALL
CALL TO AUDIENCE - at this time, any member of the public is allowed to address the Commission on any
issue not listed on today’s agenda. Pursuant to the Arizona open meeting law, individual Commission
members may ask Town staff to review the matter, ask that the matter be placed on a future agenda, or
respond to criticism made by speakers. However, the Commission may not discuss or take legal action on
matters raised during "Call to Audience." In order to speak during "Call to Audience", please specify what
you wish to discuss when completing the blue speaker card.
COUNCIL LIAISON COMMENTS (INFORMATIONAL ONLY)
DIRECTORS REPORT (INFORMATIONAL ONLY)
REGULAR SESSION AGENDA
1.REVIEW AND APPROVAL OF THE APRIL 21, 2022 MEETING MINUTES
2.DISCUSSION OF STORMWATER MEETINGS AND EVENTS
3.PRESENTATION AND DISCUSSION OF UPDATES TO FEDERAL EMERGENCY MANAGEMENT
AGENCY NEW FLOOD INSURANCE RISK RATING 2.0 PROGRAM PRESENTED BY JOSEPH
CUFFARI, PIMA COUNTY REGIONAL FLOOD CONTROL DISTRICT
4.PRESENTATION AND DISCUSSION OF THE FEMA FLOODPLAIN STUDIES FOR LA CHOLLA AND
MUTTERER WASHES
5.PRESENTATION AND DISCUSSION OF ORO VALLEY MONSOON PREPAREDNESS
FUTURE AGENDA ITEMS
ADJOURNMENT
POSTED: 6/9/22 at 5:00 p.m. by dt
When possible, a packet of agenda materials as listed above is available for public inspection at least 24 hours prior
to the Commission meeting in the Town Clerk's Office between the hours of 8:00 a.m. – 5:00 p.m.
The Town of Oro Valley complies with the Americans with Disabilities Act (ADA). If any person with a disability needs
any type of accommodation, please notify the Town Clerk’s Office at least five days prior to the Commission meeting
at 229-4700.
INSTRUCTIONS TO SPEAKERS
Members of the public have the right to speak during any posted public hearing. However, those items not
listed as a public hearing are for consideration and action by the Commission during the course of their
business meeting. Members of the public may be allowed to speak on these topics at the discretion of the
Chair.
If you wish to address the Commission on any item(s) on this agenda, please complete a blue speaker card located
on the Agenda table at the back of the room and give it to the Recording Secretary. Please indicate on the
speaker card which item number and topic you wish to speak on, or if you wish to speak during “Call to
Audience,” please specify what you wish to discuss when completing the blue speaker card.
Please step forward to the podium when the Chair announces the item(s) on the agenda which you are interested in
addressing.
1. For the record, please state your name and whether or not you are a Town resident.
2. Speak only on the issue currently being discussed by the Commission. Please organize your speech, you will only
be allowed to address the Commission once regarding the topic being discussed.
3. Please limit your comments to 3 minutes.
4. During “Call to Audience”, you may address the Commission on any issue you wish.
5. Any member of the public speaking must speak in a courteous and respectful manner to those present.
Thank you for your cooperation.
“Notice of Possible Quorum of the Oro Valley Town Council, Boards, Commissions and Committees: In accordance
with Chapter 3, Title 38, Arizona Revised Statutes and Section 2-4-4 of the Oro Valley Town Code, a majority of the
Town Council, Board of Adjustment, Historic Preservation Commission, Parks and Recreation Advisory Board,
Stormwater Utility Commission, and Water Utility Commission may attend the above referenced meeting as a
member of the audience only.”
Stormwater Utility Commission 1.
Meeting Date:06/16/2022
Submitted By:Yarina Hynd, Public Works
SUBJECT:
REVIEW AND APPROVAL OF THE APRIL 21, 2022 MEETING MINUTES
RECOMMENDATION:
Staff recommends approval.
EXECUTIVE SUMMARY:
N/A
BACKGROUND OR DETAILED INFORMATION:
N/A
FISCAL IMPACT:
N/A
SUGGESTED MOTION:
I MOVE to approve (approve with changes), the April 21, 2022 meeting minutes.
Attachments
04-21-22 Draft Minutes
D R A F T
MINUTES
STORMWATER UTILITY COMMISSION
REGULAR SESSION
APRIL 21, 2022
HOPI CONFERENCE ROOM
11000 N. LA CAÑADA DRIVE
REGULAR SESSION AT OR AFTER 4:00 PM
CALL TO ORDER
Chair Cuffari called the meeting to order at 4:00 P.M.
ROLL CALL
Present: Richard Crocker, Vice Chair
Gary Mattson, Commissioner
David Parker, Commissioner
Joseph Cuffari, Chair
Absent: William Thomas, Commissioner
Staff Present:John Spiker, Stormwater Division Manager
Joe Andrews, Chief Civil Deputy Attorney
Commissioner Thomas asked to be excused.
Town Attorney Joe Andrews left at 4:06 P.M.
Town Council Liaison Harry Greene was absent.
CALL TO AUDIENCE
There were no speakers at this time.
COUNCIL LIAISON COMMENTS (INFORMATIONAL ONLY)
Councilmember Harry Greene was not present.
DIRECTORS REPORT (INFORMATIONAL ONLY)
Stormwater Division Manager John Spiker commented on the following:
Recent flooding in South Africa where lives were lost and many left homeless, to let it serve as a reminder
to review our properties to be prepared for the upcoming monsoon season.
Pima County has started the loop path pavement extension project along the east bank of Big Wash just
north of Oro Valley Hospital.
Arizona Department of Environmental Quality (ADEQ) has scheduled Stormwater Analytical Testing &
Monitoring Protocol Seminars for the month of May.
Arizona Floodplain Management Association is holding their Spring Conference in Tucson May 4-6.
4/21/22 Minutes, Stormwater Utility Commission Regular Session 1
REGULAR SESSION AGENDA
1.REVIEW AND APPROVAL OF THE MARCH 17, 2022 MEETING MINUTES
Motion by Commissioner David Parker, seconded by Vice Chair Richard Crocker to approve the
March 17, 2022 meeting minutes.
Vote: 4 - 0 Carried
2.DISCUSSION OF STORMWATER MEETINGS AND EVENTS
Mr. Spiker reported on recent meetings and events.
3.DISCUSSION OF 2021/2022 TOWN OF ORO VALLEY MS4 COMPLIANCE SCHEDULE, THIRD
QUARTER REPORT
Mr. Spiker reported on the 3rd quarter of the MS4 Compliance Schedule of the 21/22 reporting period.
Mr. Spiker explained we are required to do these particular tasks on the compliance schedule because
it is part of our MS4 permit with the state, we are required to meet all the tasks.
4.PRESENTATION AND DISCUSSION OF THE TRANQUILO AT RANCHO VISTOSO SUBDIVISION
BANK PROTECTION DEVELOPMENT
Mr. Spiker reported on the elevation up out of the Federal Emergency Management Agency (FEMA)
floodplain of the Tranquilo at Rancho Vistoso Subdivision through the use of soil cement bank
protection.
5.PRESENTATION AND DISCUSSION OF THE ORO VALLEY STORMWATER UTILITY FEE
STRUCTURE AND STATE OF ARIZONA STORMWATER UTILITY FEE PEER REVIEW
As part of the ongoing Stormwater Utility responsibilities and activities discussion, Mr. Spiker gave a
presentation of the current Town of Oro Valley Stormwater Utility fee structure as well as a review of
other Stormwater agencies throughout the state.
6.DISCUSSION AND POSSIBLE ACTION REGARDING THE CANCELLATION OF THE MAY 19, 2022
SWUC REGULAR SESSION MEETING
Discussion ensued regarding the cancellation of the May 19, 2022 meeting.
Motion by Commissioner David Parker, seconded by Vice Chair Richard Crocker to approve
cancellation of the May 19, 2022 SWUC Regular Session Meeting.
Vote: 4 - 0 Carried
FUTURE AGENDA ITEMS
4/21/22 Minutes, Stormwater Utility Commission Regular Session 2
FUTURE AGENDA ITEMS
Topics considered that could be discussed at a future meeting included:
Monsoon preparedness
CDO bank protection
Update 2.0 Flood Insurance
Budget in preparation for upcoming rate review
ADJOURNMENT
Motion by Commissioner Gary Mattson, seconded by Vice Chair Richard Crocker to adjourn the
meeting.
Vote: 4 - 0 Carried
Chair Cuffari adjourned the meeting at 5:42 P.M.
I hereby certify that the foregoing minutes are a true and correct copy of the minutes of the regular session of the
Town of Oro Valley Stormwater Utility Commission of Oro Valley, Arizona held on the 21st day of April, 2022. I
further certify that the meeting was duly called and held and that a quorum was present.
___________________________
Yarina Hynd
Office Specialist
4/21/22 Minutes, Stormwater Utility Commission Regular Session 3
Stormwater Utility Commission 2.
Meeting Date:06/16/2022
Requested by: John Spiker, Public Works Submitted By:John Spiker, Public Works
SUBJECT:
DISCUSSION OF STORMWATER MEETINGS AND EVENTS
RECOMMENDATION:
N/A
EXECUTIVE SUMMARY:
The following is a list of immediate past, and future, stormwater meetings and events.
April 21, 2022 - Oro Valley Stormwater Utility Commission Regular Session Meeting
May 9, 2022 - Pima Association of Governments, Water Resources Low Impact Development
Committee Meeting
May 18, 2022 - Pima County Regional Flood Control District Advisory Committee Meeting
May 19, 2022 - Oro Valley Stormwater Utility Commission Regular Session Meeting - CANCELED
May 25, 2022 - City of Tucson/Pima County Flood Insurance Outreach Presentation
June 1, 2022 – Oro Valley Town Council Tentative Budget Meeting
June 3, 2022 - Oro Valley Stormwater Utility Municipal Employee Training
June 12 - 18, 2022 - National Weather Service Monsoon Awareness Week
June 13, 2022 - Pima Association of Governments, Water Resources Low Impact Development
Committee Meeting
June 15, 2022 - Pima County Regional Flood Control District Advisory Committee Meeting
June 15, 2022 - Oro Valley Town Council Final Budget Meeting
June 16, 2022 - Oro Valley Stormwater Utility Commission Regular Session Meeting
June 22, 2022 - Pima County Flood Response Training
BACKGROUND OR DETAILED INFORMATION:
For informational purposes only.
FISCAL IMPACT:
N/A
SUGGESTED MOTION:
N/A
Stormwater Utility Commission 3.
Meeting Date:06/16/2022
Submitted By:John Spiker, Public Works
SUBJECT:
PRESENTATION AND DISCUSSION OF UPDATES TO FEDERAL EMERGENCY MANAGEMENT AGENCY
NEW FLOOD INSURANCE RISK RATING 2.0 PROGRAM PRESENTED BY JOSEPH CUFFARI, PIMA COUNTY
REGIONAL FLOOD CONTROL DISTRICT
RECOMMENDATION:
For informational purposes only
EXECUTIVE SUMMARY:
The National Flood Insurance Program’s (NFIP) current rating methodology has not changed since the 1970s and
does not consider individual flood risk and underlying home values. Since then, technology, access to data, and the
understanding of flood risk have evolved. By leveraging industry best practices and current technology, the Federal
Emergency Management Agency (FEMA) can deliver rates that are easier to understand and better reflect a
property’s unique flood risk. FEMA seeks to achieve more complete recovery by accurately and clearly
communicating flood risk and how it is reflected in flood insurance costs, providing individuals with information to
make more informed decisions on purchasing flood insurance and reducing flood risk.
Risk Rating 2.0 will fundamentally change the way FEMA rates a property’s flood risk and prices insurance by
incorporating common sense variables (e.g., more types of flood risk and distance to flooding source) into the rating
methodology. Pairing state-of-the-art industry technology with the NFIP’s mapping data to establish a new
risk-informed rating plan. You are encouraged to read the FEMA Risk Rating 2.0 Fact Sheet for more information
which can be found on FEMA’s website.
Risk Rating 2.0 Effective Dates:
PHASE I
New and renewing policies beginning Oct. 1, 2021, will be subject to the new rating methodology.
PHASE II
All remaining policies renewing on or after April 1, 2022, will be subject to the new rating methodology.
BACKGROUND OR DETAILED INFORMATION:
Since damages resulting from flooding are usually not covered under regular homeowner or business insurance
policies, specific flood insurance policies are needed. Renters may also purchase contents coverage flood
insurance. The National Flood Insurance Act of 1968 made affordable flood insurance possible through
federally-subsidized programs. Property owners in Oro Valley may purchase flood insurance that will typically
cover structures and their contents from losses due to flooding. Improvements such as fencing, walls, swimming
pools, landscaping or small storage sheds, however, are usually not covered by this insurance.
If your home is in a federally-mapped (FEMA) floodplain and you finance it with a loan backed by the federal
government, then flood insurance is mandatory. Even when not required by law, the Stormwater Utility always
recommends purchasing flood insurance. Many flood damaged structures are located outside of federally mapped
floodplains. It is not uncommon for property owners to discover that their homeowners insurance does not cover
flooding only after they have been flooded.
When you are planning to purchase a new home or property always confirm the floodplain status of the property
before you purchase the property. You can do this yourself by contacting our office. Please note that real estate
agents are only required to determine if a property is within a federally mapped floodplain, so if your realtor provides
flood information to you, be sure to verify whether or not the realtor has determined if the property is impacted by
locally mapped floodplains. Additional information on flood insurance can also be obtained from FEMA.
FISCAL IMPACT:
N/A
SUGGESTED MOTION:
N/A
Attachments
FEMA Risk Rating 2.0 Update
Individual Risks,
Individual Insurance,
Risk Rating 2.0
JOSEPH CUFFARI, CFM
PROGRAM MANAGER & PUBLIC INFORMATION OFFICER
PIMA COUNTY REGIONAL FLOOD CONTROL DISTRICT
Risk Rating 2.0 –Equity in Action
Equity in Action = Property owners will no longer pay more than their share in
premiums based on the value of their home.
When Did This Go Into Effect & What are
the Benefits
Beginning October 1, 2021, new policyholders were subject to the new
flood rating system (230,000 new policies as of October 2021).
April 1, 2022, or after, all renewing policyholders were/will be folded into
the new program (509,000 renewed policies as of October 2021).
What’s the Deal With Risk Rating 2.0
FEMA, through new pricing methodology, will better
inform individuals and communities about flood risk, set
premiums to strongly signal those risks and promote
actions to mitigate against them.
Pre RR2.0 NFIP policies statistics (2021):
5 million policies in force
$1.3 Trillion in coverage amount
22,525 communities across the nation
75% are part of the CRS
67% of all policies come from CRS communities
It pays to be in the CRS
New Methods for Pricing Flood Insurance
New pricing methodology
Arizona = 25% immediate decrease. 68% will see a no change or up to $10 increase per month. Simplified approach in rating methodology
Use of 2018 Affordability Framework as a guide
Lower income earners generally live in higher hazard areas. How do we combat this?
Utilizes resource investments and best available data
FEMA sourced data
Additional data sources (USGS, US Army Corps, NOAA)
Includes up front fees and surcharges
Simplify the quote process –policies will show the total premium price
Eliminate mandatory elevation certificate requirement for policy pricing
Elevation certificates will still be required for verifying construction and floodplain management
Expanded mitigation credits
Expand CRS discounts to ALL floodplains (SFHA, OFHA, X, etc.). Discounts will be uniformly applied across the community.
35% for Pima County
20% City of Tucson
15% Town of Marana
Leveraging more information on flood hazards related to levees –all levees will be considered regardless of if they are accredited or not
Reflects prior claims
Prior NFIP claims is based on a loss history over a 20-year rolling window period and 1 claim is forgiven
Only counts claims over the deductible amount
Replacement Cost Value (RCV) instead of Full Cash Value (FCV)
RCV is not the market value of the structure -just the cost to rebuild what would be damaged
Considers loss difference between higher-valued and lower-valued homes
BFEs and flood zones will not be used in rating consideration
What IS Changing
What IS NOT Changing
Federal law of rate caps on premium increases ( max 18%) -> set by Congress
Premium discounts through CRS involvement
Transfer of discounts to new property owners
Use of FIRMs for mandatory purchase and floodplain management regulations
Surcharges
What is Being PHASED OUT
Preferred risk policies (X-zones)
Grandfathered rates
Mortgage Portfolio Protection (rarely used)
Submit for Rates (rarely used)
Rating Variables
Flood type or river class (fluvial vs. pluvial)
Fluvial = relating to a stream/river/ocean
Pluvial = relating to rain
Distance to flooding source (main
channel)
Elevation (lowest finished floor and
finished floor elevation)
Flood frequencies (10-year, 100-year,
500-year)
Building Variables
Replacement Cost Value
Construction type (wood vs. masonry)
Foundation type
# of floors
Mitigation credits:
Post, piles, piers -> with or without enclosures
underneath (mostly in coastal zones)
Flood openings -> specific credit applied varies
based on foundation type and first floor height.
Percentage is based on height above grade and
type of use.
Machinery & Electrical equipment elevation
Data and Analysis –How is a Policy Rated
First floor height tool and FEMA assumptions comes from CORELOGIC
CORELOGIC tool is NOT available to communities right now for testing
Property owners can provide additional information to their insurance agent to
help refine a quote. If after providing additional information and the quote
increases, the lower premium will be given. Additional information includes:
Ground elevation survey
Elevation certificate for finished floor elevation
RCV quotes
Claims history
Pictures/verification of mitigation elements
The mandatory elevation certificate requirement was gotten rid of to account for
Zone-X not having elevation certificates. There was no data for those structures.
Data and Analysis cont.
Elevations of the structure will be relative to flooding source
Local relative elevation = 500 meters squared
If the structure sits higher than the average of the surrounding area, it
will be a lower rate; if it sits lower than the average it will be a higher
rate
First floor height = first living floor above ground
Important for electrical/machinery and mitigation discounts
Various ratings of the elevation of first floor height :
Data and Analysis cont.
Distance to flooding source is key. It has the greatest effect on premiums.
o Then, elevation of structure related to flooding source and RCV
Flooding source is based on the National Hydrography Dataset Version 2+ (next slide)
o Used for flooding source
o HUC 12 territory factor is important too
LOMR/LOMAs do not have any real bearing on flood insurance pricing
o The risk is still there at the 101-year flood event –Wants to take into account the potential for
greater floods in an area
o Gets the homeowner out of the mandatory purchase requirement
o In general, $15/$1000 coverage
o $12,125 maximum flood insurance cost for an SFR @ $250k/$100k
o RCV @ $600,000
National Hydrography Dataset Version 2+
Stream lines
Polygons
Estimated CRS Rating Modification Impact -
Pima County
Zip Code Breakdowns
Case Study –Mt. Lemmon Short Rd.
Zone X, Local Floodplain (Soldier Canyon)
Roughly 300 feet from flooding source (fluvial)
Pima County (25% discount)
$1,402 savings
Replacement Cost Value = >$600,000
Substantially Improved
First floor height = 0.3 Core Logic
Full Coverage (250K building, 100k contents)
$3,375
Case Study –Camino De La Jicarilla
Zone X-Shaded, 500-year floodplain
No option to input “X-Shaded”
Roughly 543 feet from flooding source (fluvial?)
Bank protected
City of Tucson(20% discount)
$837 savings
Replacement Cost Value = >$250,000
First floor height = 1.1 Core Logic
Full Coverage (250K building, 100k contents)
$4,897
Case Study –Postvale Rd.
Zone A
Roughly 438 feet from flooding source (fluvial)
Pima County (25% discount)
$1,225 savings
Replacement Cost Value = >$90,000
First floor height = 1.0 Core Logic
Full Coverage (250K building, 100k contents)
$2,989
Case Study –Tucson Mountain Dr.
Zone X
Roughly 719 feet from flooding source (pluvial?)
Pima County (25% discount)
$142 savings
Replacement Cost Value = >$300,000
First floor height = 1.1 Core Logic
Full Coverage (250K building, 100k contents)
$615
Cost Breakdowns and Questions
Mt. Lemmon Short Rd.Camino De La Jicarilla S. Postvale Rd.
Questions:
•Reserve Fund Assessment? –“…purpose is to set aside a fund to pay future claims.” (Flood Insurance
Manual)
•Mitigation Discount does not count for much? Is it worth it for already in-place equipment?
•Zone X-Shaded, bank protected, lesser valued home is rated a higher premium than more at-risk
structures?
•No X-Shaded option, just X
•Distance to flooding source (main channel)?
5% Electrical/machinery
elevated above first floor
Questions Answered
Distance to flooding source?
Distance to River (DTR) is the calculated geodesic distance to the nearest river feature (line or
polygon within a location’s corresponding HUC12. We have had the question if it uses just the
baselines from the FIRMs, or does it include flow lines from other sources. For segment 4 (the one
Arizona is in) for a non-levee situation the rating factor varies and it is 1.111 if the distance is between
0 and 100 meters, at 200 meters the rating factor is 1.000, and the greatest distance listed is 900
meters and the rating factor is 0.973. If the property is above the nearest river this should give a low
rating factor for the Elevation Relative to River (this is another factor that is taken into consideration).
This rating factor also depends upon the river’s class, which vary from A to I. One location indicates
that it is determined using the relationship between 10 and 100 year flood depths from the KatRisk
model from a catastrophe modeling company.
Reserve Fund Assessment?
The Reserve fund assessment was included in BW12 and is 18%. From the Flood Insurance Manual,
“The Reserve Fund Assessment is a percentage of the Discounted Premium (excluding the Federal
Policy Fee, HFIAA surcharge, and probation surcharge) paid on new and renewed policies.
Revenues from this statutorily-mandated assessment build an NFIP Reserve Fund to pay claims after
catastrophic flood events.” It isn’t included when determining the Agent’s commission.
Case Study –1st Street
Zone X
Street drainage (pluvial)
City of Tucson (20% discount)
$33 savings
Replacement Cost Value = >$120,000
First floor height = 3.1 Core Logic
Coverage (100K building, 50k contents)
$684 Not primary
residence ($250)
Case Study –Venice Ave.
Zone AE
Flooding source? (fluvial?)
City of Tucson (20% discount)
$470 savings
Replacement Cost Value = >$170,000
First floor height = 1.1 Core Logic
Full Coverage (250K building, 100k contents)
$2,522
Case Study –Venice Ave. continued
Elevation Certificate
shows that structure is
below the base flood
elevation
Example of when it is
better to use FEMA’s
Core Logic finished floor
rating
Policy renewed (2/14/22)
and was reduced about
$1,000 from quote.
Bundling building and
contents coverages
Different deductible
limits
National Flood Association Conference –
March 29, 2022 (Overview)
“Equity ” (social vs. economic vs. cultural, etc.)
o Be clear on what you are trying to communicate and to whom
Flood risk info needs to be translated to Climate Change Risk
o “Graduated flood hazards”
o RiskMAP outputs vs. using flood zones
Who really needs flood insurance?
RR2.0 is designed to try and address that question
Over 33,000 insurance agents have been trained in how to use the RR2.0
application
Data sheets or materials needed for agents on what goes into a quote.
They are not able to answer questions and often confuse the client
Not versed in floodplain management
Real estate community is not really concerned with RR2.0 (lack of understanding?)
National Flood Association Conference –
March 29, 2022 (Wants)
RR2.0 needs to be more accessible to the general public and especially floodplain
managers to help communicate changes to constituents
Need locally relevant examples and not just scenarios based on coastal regions
o At least need more inland examples, FEMA Region examples?
o Applies to FEMA as a whole
Machinery and Electrical elevation discount should be a bigger mitigation credit in
the future
Census tracts could be factored in
CoreLogic to accept community elevation certificates to revise their systems –
removes an extra step for the property owner
Revise the elevation certificate to make it easier for homeowners to fill out
ASFPM National Conference –
May 17, 2022 (the future)
Positives
Standard web address to access the pricing portal
Not a software product
Quick and easy to produce and receive quotes
5 minutes
“Flood Chat” online help tool for insurance agents
Pictures showing elevation methods and foundation types
Slab on grade, crawlspace, piers, basement, etc.
Latitude and Longitude used for central point
Not just the property address
Occupancy Information gathered
Small business under/over 100 employees, non-profit entity, primary
residence, rental
Being used to verify “equity in action” and contents coverage?
Important Links and More
Information
Joseph Cuffari, CFM,
Program Manager & Public Information Officer
Pima County Regional Flood Control District
Joseph.Cuffari@pima.gov
Risk Rating 2.0 -https://www.fema.gov/flood-insurance/work-with-nfip/risk-rating
Video -https://www.youtube.com/watch?v=oi2g-0GfgMk
Stormwater Utility Commission 4.
Meeting Date:06/16/2022
Requested by: John Spiker, Public Works Submitted By:John Spiker, Public Works
SUBJECT:
PRESENTATION AND DISCUSSION OF THE FEMA FLOODPLAIN STUDIES FOR LA CHOLLA AND
MUTTERER WASHES
RECOMMENDATION:
For informational purposes only
EXECUTIVE SUMMARY:
The National Flood Insurance Program (NFIP) requires participating communities to adopt floodplain management
ordinances containing certain minimum requirements intended to reduce future flood losses. This is a condition of
the agreement for making flood insurance available in a community. Part of the NFIP regulations relates directly to
identifying and mapping Special Flood Hazard Areas (SFHAs). These tasks assist in the Federal Emergency
Management Agency’s effort to identify and publish up-to-date SFHAs.
Upon completion of the La Cholla Boulevard roadway widening project, the conditions were met along the La
Cholla Wash Complex to trigger such a change in the FEMA SFHAs and it became necessary for the Town and
Pima County to coordinate with FEMA to revise the effected floodplains. A request was made to the Arizona
Department of Water Resources (ADWR) in 2020 to assist in a floodplain re-study. The request was sent up to
FEMA and accepted in 2021 to begin the effort. FEMA and their Risk Team contracted with JE Fuller to gather data
and begin the floodplain revision study.
Simultaneously, the Town requested ADWR to assist in a floodplain study on the Mutterer/Rooney/Pusch Wash
Complex on the west side of Oro Valley. Historic flooding issues, missing floodplain data, and urbanization in the
area have triggered a need for an updated, more detailed floodplain study. This request was also accepted by
FEMA and incorporated into the La Cholla Wash Complex re-study.
FEMA has completed the hydrology and hydraulic analysis and is currently preparing draft working maps which will
then be used as exhibits in formal public meetings. Announcements on these public meetings will be made
available publicly in the near future.
BACKGROUND OR DETAILED INFORMATION:
N/A
FISCAL IMPACT:
N/A
SUGGESTED MOTION:
N/A
Attachments
La Cholla and Mutterer Wash floodplain study
La Cholla and Mutterer Washes
Floodplain Re-Study
June 16 , 2022
Oro Valley Stormwater Utility
A genda
Introductions
Why are we here?
Oro Valley Flood Hazard Restudy
Scope of Work and Deliverables
Project Schedule
Next Steps
Strategies to Reduce Flood Risk
Questions
Introductions
Risk MAP Project Team
Federal Emergency Management Agency
Compass Project Team
Community Representatives
Pima County Regional Flood Control District
Oro Valley Stormwater Utility
State Representatives – Arizona Department of Water Resources
Oro Valley Stormwater Utility 3
Why are we here?
Oro Valley Stormwater Utility 4
The Value of Updated Flood Maps for Local Communities
Oro Valley Stormwater Utilty 5
Identifying and
Assessing
Flood Risk
Establishing
Flood Insurance
Rates
Determining
Local Land Use
Informing
Engineers
and Developers
Equipping
Emergency
Managers
•All floods are different. Nature and communities
change.
Risk changes over
time
•Communities may face flooding. It’s important
to understand how and where flooding could
occur to assess impacts.Flooding happens
•Proactive communities plan to reduce flood
impacts and other hazards.
Mitigation is
Possible
Flood Hazard Analysis:
Click to add text
Oro Valley Stormwater Utility 6
Oro Valley Stormwater Utility
Study Area
7
Oro Valley Stormwater Utility
Hydrology and hydraulic analyses of flood hazards in Oro Valley and development of products to assess and
document flood risk
Tasks included:
Base map preparation
Survey
Topographic data processing
Hydrology – HMS rainfall runoff model and FLO-2D
Hydraulic Analyses – HEC-RAS and FLO-2D
Floodplain mapping - Workmap
Flood risk products (FRP) – Changes since last FIRM, depth grids, elevation surfaces
Flood Risk Review Meeting
Study Scope
8
•2015 LiDAR provided by Pima
County Association of
Governments (PAG)
•LiDAR data was acquired in
March 2015 by Sanborn Map
Company using a Leica ALS70
Airborne Laser Scanner
•Project horizontal datum is
Arizona State Plane, Central
zone, NAD83 (2011), epoch
2010.0, with units in
International Feet. Vertical
datum is NAVD88.
•LiDAR met National Standard for
Spatial Dataset Accuracy
Topography
9
Topography
10
Hydrologic
Rainfall model -HEC-HMS 4.6
FLO-2D for La Cholla Wash Watershed
south of Lambert Lane
Comparison to the effective where
applicable
Hydraulic
HEC-RAS 5.0.7, steady flow
FLO-2D for La Cholla Wash Watershed
south of Lambert Lane
HEC-RAS 5.0.7 2D was used for Mutterer
Wash breakout analysis (not in original
SOW)
Floodway
Hydrologic & Hydraulic Analysis
11
Project location and watershed
Oro Valley Stormwater Utility
No gage data available
Calculated discharges using
Oro Valley Drainage Criteria Manual (2010)
for Rooney Wash Watershed
Pima County standards (Technical Policy 18)
for La Cholla Wash Watershed
Applied area reduction factor
Rainfall
Table 3-4 of the Oro Valley Drainage Criteria
Manual (2010) for Rooney Wash
Watersheds
NOAA Atlas 14 data for La Cholla Wash
Watersheds
Hydrology Analysis
Oro Valley Stormwater Utility 12
Comparison with FIS
Discharges (Table 16 of
Hydrology Report)
Hydrology Analysis –
Calibration Data
Oro Valley Stormwater Utility 13
Comparison with other area
studies (Table 16 of Hydrology
Report)
La Cholla Blvd Drainage Report
Lomas de Oro Channel DCR
Hydrology Analysis –
Calibration Data
Oro Valley Stormwater Utility 14
Comparison with Regional
Regression Equation
(RRE) results (Table 17 of
Hydrology Report)
RRE results from USGS
Scientific Investigations
Report 2014–5211
Study results were higher
than RRE in urban areas
where urbanization is not
reflected in RRE
estimates
Hydrology Analysis –
Calibration Data
Oro Valley Stormwater Utility 15
1-D simulation for La Cholla Wash and
tributaries (north of Lambert Lane) and
Rooney Wash and tributaries
Known WSEL from effective map was used
at the downstream boundary condition for
Rooney Wash
FLO-2D modeling for La Cholla wash south
of Lambert Lane (20’ grid size)
Inflow hydrographs from rainfall model
were applied at upstream boundary for the
La Cholla Wash FLO-2D model
Flow breakout determined for Mutterer
Wash at Greenock Dr led to HEC-RAS 2D
modeling of breakout flow
Hydraulic Analysis
Oro Valley Stormwater Utility 16
HEC-RAS 1D Mapping north of
Lambert Lane
includes;
La Cholla Wash
Canada Hills Wash
Lomas de Oro Wash
North Rancho Felix Tributary 2
Existing mapping is entirely
Zone A, no BFEs
Per community request, no
floodway mapping is being
proposed in this area
Hydraulic Analysis –
La Cholla Wash Watershed
North of Lambert Lane
Oro Valley Stormwater Utility 17
FLO-2D Mapping south of Lambert
Lane
includes;
La Cholla Wash
Canada Hills Wash
Lomas de Oro Wash
North Rancho Felix Tributary 2
Existing mapping is entirely
Zone A, no BFEs
Per community request, no
floodway mapping is being
proposed in this area
Hydraulic Analysis –
La Cholla Wash Watershed
South of Lambert Lane
Oro Valley Stormwater Utility 18
Rooney Wash Watershed mapping includes;
Rooney Wash
Pusch Wash
Pusch Wash East Fork
Pusch Wash West Fork
El Conquistador Wash
Mutterer Wash
Existing mapping is entirely Zone A,
except Pusch Wash upstream of Oracle
Road and Pusch Wash East & West Forks,
which are Zone AE with floodway
Revised mapping along Pusch Wash East &
West Forks diverges noticeably from the
existing mapped flow paths
Hydraulic Analysis – Rooney Wash Watershed
Oro Valley Stormwater Utility 19
Mutterer Wash breakout
occurs at Greenock Drive
Peak 100-year breakout
flow is 214 cfs
To address this flow, HEC-
RAS 2D mapping was
performed outside the
original scope of services
for this project
Hydraulic Analysis – Mutterer Wash Breakout
Oro Valley Stormwater Utility 20
Hydraulic Analysis – Mutterer Wash Breakout – Flow Depths
Oro Valley Stormwater Utility 21
Floodways were determined
only for the existing
segments of Pusch Wash
where floodways are
currently mapped
The map at right shows the
updated floodway
delineations and XS lettering
Floodway tables are shown
on the following slides
Initial encroachment was
estimated, then multiple
iterations were performed to
determine the final floodway
Hydraulic Analysis – Floodway
Oro Valley Stormwater Utility 22
La Cholla Boulevard Construction
Incorporated into model
Photo at left shows La Cholla Wash crossing
of La Cholla Blvd
CLOMR - Case No. 21-09-1501R
Provided Hydrology Report and FLO-2D
model to communities March 2021
Project to be informed by Workmaps being
shared
Coordination with Active Projects
Oro Valley Stormwater Utility 23
24
Schedule
Oro Valley Stormwater Utility 24
Overall Project Timeline/Workflow
Project Kick off
Discuss scope, plans,
and schedule
Issue Letter of Final Determination (LFD)
Flood Risk Review Meeting
Discuss engineering
analysis and review draft
work maps
Data
Acquisition
Engineering
Analysis
Floodplain
Mapping
Preliminary
Map
Production
Post Preliminary
Process
Implement
Outreach Plan
Work Map
Comments
Provide
Study Data
Develop Community
Outreach Plan
Project Timeline | Oro Valley Flood Study
Map Production Timeline |Typical Flood Study
Effective Maps
Physical Map Revision (PMR)
Preliminary FIRM
Meeting CCO
Meeting
Proposed Flood Hazard
Determinations | Appeal
PeriodFebruary 16 2022August 26, 2020July 26, 2022
Oro Valley Stormwater Utility
Ef fective Maps (Regulatory Products) will follow the Post- Preliminary
Processing Schedule
Preliminary
Phase
Meetings 90-Day Appeal &
Comment Period
Resolve
Appeals &
Finalize Map
Products
6-Month Compliance
Period
Preliminary Maps Issued
Consultation Coordination Officer (CCO)
Meeting
End of Appeal & Comment Period
Letter of Final Determination
Effective Maps
Fl ood Risk Review Meeting
Oro Valley Stormwater Utility 27
Next Steps
27
Next Steps: Over the next 60 days
28
Partnering
comments were provided April 18, 2022
Project will next
initiate production of
Preliminary Maps and
Report following
receipt of comments
Oro Valley Stormwater Utility
Oro Valley Stormwater Utility
Nex t Steps: Preliminary Regulatory Products (Flood Insurance Study
Report and Maps)
Oro Valley Stormwater Utility
Opportunity to File Appeal or Comment
Appeal
Technical data showing proposed flood zone, zone boundary, floodway, or
Base Flood Elevation (BFE) are scientifically incorrect
Comment
Objection to base map feature changes such as labels, incorrect roads,
jurisdictional boundaries or any other non-appealable change
Preliminary Products will have a 90-Day Appeal and Comment Period
30
Strategies To Reduce Your Flood Risk
Oro Valley Stormwater Utility 31
Save Money!
Strategies To Reduce Your Flood Risk
There are many strategies you can take to reduce your flood risk
Oro Valley Stormwater Utility 32
Prevention
Affects future development
Includes ordinances and building
codes
Property protection
Affects existing development
Includes elevation and acquisition
Public education and awareness
Informs people about risk
Includes outreach activities
Natural resource protection
Protects water quality
Protects Habitats
Restores resources
Emergency services protection
Protects critical facilities
Structural projects
Involves construction
Includes berms
Includes altering stream routes
Multi-Hazard Mitigation Planning
Federal Disaster Mitigation Act
of 2000
Development of a local
government plan is required
in order to maintain
eligibility for certain federal
disaster assistance and
hazard mitigation funding
programs.
Incorporate draft updated flood
risk data
Oro Valley Stormwater Utility 33
Oro Valley Stormwater Utility
Questions? Comments?
Dennis Roberts
•droberts@orovalleaz.gov
•(520) 229-4818
34
Thank you!
Stormwater Utility Commission 5.
Meeting Date:06/16/2022
Requested by: John Spiker, Public Works Submitted By:John Spiker, Public Works
SUBJECT:
PRESENTATION AND DISCUSSION OF ORO VALLEY MONSOON PREPAREDNESS
RECOMMENDATION:
For informational purposes only
EXECUTIVE SUMMARY:
The summer rainy season will soon be here, and the Town of Oro Valley Stormwater Utility would like to remind
everyone to stay monsoon aware and monsoon safe. These intense summer rain storms are an enjoyable break
from the heat but do contain heavy rain, powerful lightening, and strong winds and dust; potentially causing
dangerous flash floods. Flash floods are the number one weather related cause of death in the United States, with
nearly half of those fatalities being vehicle related.
In preparation of the upcoming monsoon season the Oro Valley Stormwater Utility has been actively performing
outreach with our partnering agencies, our residents and our internal staff in a coordinated effort to make this
summer rainy season a more enjoyable and safe experience for all.
BACKGROUND OR DETAILED INFORMATION:
Below are some helpful web links offering information and tips on staying monsoon aware and monsoon safe.
Oro Valley Monsoon Preparedness Guide
Oro Valley CodeRED Alerts
Pima County Tips For Surviving Monsoon
KGUN 9 Monsoon Awareness 2022 News Story
National Weather Service Monsoon Awareness Week
Turn Around Don’t Drown
FISCAL IMPACT:
N/A
SUGGESTED MOTION:
N/A
Attachments
Monsoon Preparedness
Town of Oro Valley
Monsoon Preparedness
June 16, 2022
Monsoon Preparedness
Every summer, Southern Arizona experiences a
weather phenomenon known as monsoon season.
From approximately June 15 to September 30,
monsoon season is marked by intense rain, lightning
and thick dust storms.
While the rain provides a welcome relief from the
usual arid heat, the high winds and thunderstorms
that accompany this weather shift often create
treacherous conditions. Dust storms and flash floods
are prevalent during this time of year, making it
exceedingly important to be prepared.
Monsoon Preparedness
National Weather Service –Monsoon Awareness Week
June 12 –18, 2022
Every June, SW U.S. NWS offices work
with public safety partners and broadcast
media to observe Monsoon Awareness
Week with the goal of reducing the number
of deaths, injuries and property damage
caused by weather related dangers that
occur during the monsoon. Through
education about proper precautionary
actions to be taken, lives can be saved
and property losses can be minimized.
Monsoon Preparedness
National Weather Service –StormReady Program
Oro Valley has renewed our StormReady
program with the NWS through 2027
The StormReady program helps arm
America's communities with the
communication and safety skills needed to
save lives and property - before, during and
after the event. StormReady helps
community leaders and emergency
managers strengthen local safety programs.
Oro Valley has been a StormReady
community since 2006.
Monsoon Preparedness
Regional Partnering
Oro Valley continues to work with
local partners in preparing for
monsoon season
The Multi-Jurisdictional Hazard Mitigation
Plan is an essential tool in preparing and
mitigating disasters. The Town is
participating once again toward the efforts
of our regional partners in compiling the
documentation to complete the 2022 plan
renewal. The plan sets the stage for
coordination efforts to meet the challenges
of the monsoon, as well as other disasters,
and allows the regional partners the
opportunity to apply for federal assistance
funding.
Monsoon Preparedness
Oro Valley Partnering
The Stormwater Utility continuously works
with all internal departments to prepare for
disasters
The Oro Valley Emergency Manager is responsible
for readying staff and management in disaster
preparedness. Coordination and scenario building
exercises are routinely implemented to keep lines
of communication open and help staff understand
procedures and processes of the Emergency
Operation Center. Our most recent EOC training
session was held April 1, 2022
Monsoon Preparedness
Public Outreach
The Stormwater Utility remains
proactive in pushing out the
Monsoon Preparedness message
Utilizing social media, local print media,
public meetings, podcasts, webpages,
phone, email, text messaging, and
CodeRED alert applications; Oro Valley
continues to push out warnings in regard
to monsoon preparedness.
Monsoon Preparedness
Public Outreach
The Stormwater Utility
Monsoon Preparedness
Guide is available on the
Oro Valley webpage
Offering information and tips on
how to prepare and minimize
threats from the seasonal hazards
Monsoon Preparedness
Public Outreach
The Stormwater Utility
supports our regional
partners messaging efforts
Pima County and the National
Weather Service continue to push
out messaging with their media
partners reaching residents through
television, radio, and the internet.
Monsoon Preparedness
Sandbag Program
The Stormwater Utility will once
again host a free sandbag program
to the residents of Oro Valley
Beginning June 15, 2022 the Town will be
offering free sandbags to our residents at
Naranja Park. Town residents who may
need help to protect their property from
storm damage are allowed up to 10 bags
to be filled by the resident through
September 30 .
Monsoon Preparedness
Sandbag Program
Pima County, City of Tucson,
and Town of Marana offer
sandbag programs as well
For folks not living within the Town of
Oro Valley, our regional partners offer
similar sandbag programs to their
residents. Check in with your local
jurisdiction for more information
Monsoon Preparedness
Operational and Maintenance Activities
In preparation for the upcoming monsoon season the Stormwater Utility
undertakes specific operational and maintenance actions to be ready for
the storm and debris runoff. Road closure signage and locations have been
designated across Town in coordination with our first responder partners.
Monsoon Preparedness
Operational and Maintenance Activities
Wash maintenance is a large portion of the Stormwater Utility monsoon
preparedness. Clearing sediment and debris, performing vegetation
management, and repairing deficiencies in stormwater infrastructure helps
keep the Town out ahead of potential failures
Vista Del Oro Wash –before photos
Monsoon Preparedness
Operational and Maintenance Activities
It is imperative that channel capacity and integrity are maintained to ensure
storm runoff remains where it is intended to minimize flood threats
Vista Del Oro Wash –after photos
Monsoon Preparedness
Operational and Maintenance Activities
Uncontrolled vegetation poses threats to storm channels by trapping debris
and diverting storm flow, blocking access, and impacting infrastructure.
Canyon Shadows Wash –before photos
Monsoon Preparedness
Operational and Maintenance Activities
Canyon Shadows Wash –after photos
Monsoon Preparedness
Operational and Maintenance Activities
Inspections play an important role in helping the Stormwater Utility remain
prepared to handle monsoon storm runoff. Identifying potential hazards
and maintenance needs before they can become failures remains a major
task for the Stormwater Utility.
Shadow Mountain Drive–Sediment Removal Needed Hardy Road –Sediment Removal Needed
Questions?