Stormwater Program

Workshop Public Works Department

May 1st , 2019

Focus on the Customer

Focus on the Environment

Focus on the Future

1

• Overview

• Sustainability Plan

• Funding

Stormwater Program Workshop

2

Overview

3

A Sustainable Stormwater System

Vision

Cultivate a sustainable and financially responsible stormwater

management system.

• Asset preservation and minimize risk of flood damage.

• Look for opportunities to include green infrastructure in projects.

• Seek out, evaluate, and implement innovative methods to improve water

quality, storm event management, and customer service.

4

One Water Approach

• Sustainable management of life’s most essential resource

• All water is valuable • Rivers, lakes, reservoirs, aquifers

• Watershed Planning • Include regional partners to

respond to the natural flows of watersheds and the natural ecosystem.

5

Watersheds

• Hillsborough County has 17 watersheds

• Cover 1354 Sq Miles

• Polk County and Pasco County contribute

122 Sq Miles drainage area to

Hillsborough River

• Polk County contributes 159 Sq Miles

drainage area to Alafia River Watershed

• Little Manatee River Watershed covers

76 Sq Miles Manatee County area

• SWFWMD Interjurisdictional Regulatory

Agency

6

• Pipes – 1,313 Miles

• Ditches – 1,345 Miles

• Drainage Structures – 41,545

• Ponds – 2,099

• Pump Stations - 36

Stormwater System Assets

Pump Station Rehab

Lucy Dell Pond Enhancements

7

FY 18 Revenue and Expenditures

Capital

Program,

$22.6M, 52%

Maintenance /

Operations,

$16M, 37%

Engineering /

Investigation,

$4.8M, 11%

Unincorporated

General Fund,

$20M, 46%

Grants, $1.5 M,

3%

Assessment,

$21.9M, 50%

REVENUE EXPENDITURES $43.4 Million $43.4 Million

Stormwater

Current Assessments

• Single Family Home: $42.00

• Apartment / Condominium / Townhouse / Mobile Home: $21.00 per dwelling

• Agricultural: $42.00

• Commercial / Industrial: $.035 per 1.5 square feet of impervious area

8

https://Agricultural:$42.00https://SingleFamilyHome:$42.00

Clean

Annual Improvements

Maintenance

• 50.2 miles of pipe

• 1,228 drainage structures Plan • 80 miles of ditch

• 15k cubic yards of sediment

Capital

• 5 Watershed Studies Updated

• 12 Watershed Studies Underway

Repair • 1.7 miles of pipe

• 435 drainage structures Design • 58 Flood Protection Projects

Mow • 3,320 acres Construct • 14 Flood Protection Projects

• 131 Pipe Replacement Projects

Keeping Drainage Working

9

Focus on the Environment

10

Compliance

Inspection

Analysis

Action

Met 100% inspection requirements.

Over 9,680 assets and 500 miles ditch/pipe

inspected.

Monitored 512 sites on 80 waterbodies.

Studied 43 waterbodies for health of system.

Water quality projects/initiatives,

nutrient source tracking, tree planting, street

sweeping, rain gardens, pollution prevention.

Compliance with Federal National Pollutant

Discharge Elimination System (NPDES) and

state environmental protection agencies.

- -

Focus on the Environment

Collaboration • Tampa Bay Estuary Program

• Nitrogen Management Consortium

• Adopt A Pond

• Keep Tampa Bay Beautiful

Innovation • One Water Initiative

• Green Infrastructure

• Conservation

• Aquifer Recharge

11

Sustainability Plan

12

FY 2018 Stormwater Work Requests

13

• Demand for maintenance and

flooding reduction

• Increased maintenance

• Pre-regulatory development

• Aging infrastructure failures

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–

–

–

Maintenance Service Levels

Asset Maintenance Activity Existing Service Level

Pond Systems

Pump Stations

Major Outfalls

Drainage Structures

Pipes

Ditches

Street Sweeping

• Prevent erosion & maintain healthy vegetation

• Debris and sediment removal

• Inspection and repair: electrical and mechanical

systems

• Inspect for condition and obstructions

• Clean, repair, and replace pipe/structures

• Inspect for clogs and damage

• Jet clean and vacuum or repair

• Maintain flow

• Clean, repair, and replace pipes

• Trash and debris removal

• Clean, mow, and spray to maintain flow

• Arterial roadways approx. 663 lane miles per month

• Demand sweeping citizen requests

• Local roadways approx. 4500 lane miles per year

Sustainable Service Level

10 Year Cycle

60 Day Cycle

Biannual Cycle

50 Year Cycle

Quarterly Cycle

50 Year Cycle

10 20 Year Cycle

17 Year Cycle

25 100 Year Cycle

25 Year Cycle

15 Year Cycle

Quarterly Cycle

20 Year Cycle

Annual Cycle

14

–

–

Asset Management Typical Life Span Average Asset Age

Pump Stations

• Pumps & Equipment 15 years

• Wet Well 75 years

Metal Pipes – 40 years

Concrete Pipes and Structures – 75 years

16 years

19 years

New Asset

Maintain

Inspect

Repair

Replace

39 years

29 years

Asset

Life Cycle

15

-

Asset Preservation Service Levels

Asset Activity

Pump Stations

Pipes

Flood Projects

• Pump Station life cycle replacement

• Pipe life cycle replacement

• Neighborhood, Intermediate, Regional

Flood Protection Projects

Water Quality

Hazard Mitigation

• Regulatory Compliance

• Environmental protection and

restoration

• Reduce community flood risk costs and

impacts

Existing Service Level Sustainable Service Level

30 Year Replacement

10 year backlog reduction

60 year life cycle replacement

5 year Critical backlog reduction

Neighborhood, Intermediate & Regional Projects

Enhanced water quality projects

County funded flood area mitigation projects

30 Year Replacement

Unfunded backlog

90 100 year life cycle replacement

Unfunded backlog

Neighborhood Projects

NPDES Compliance

Limited to Grant Availability

16

Sustainable Funding Proposal

Operation & Maintenance

Asset Preservation

Flood Protection, Water Quality & Hazards Mitigation

Total

Existing Funding Increased Funding Total Outcomes

$20.8M

$15.1M

$7.5M

$43.4M

$32.7M

$28.8M

$20.2M

$81.7M

$11.9M

$13.7M

$12.7M

$38.3M

• Improve customer satisfaction

• Preserve and restore drainage flow

• Improved water quality

• Regulatory compliance

• Replace failing assets to eliminate backlog

• Safety and property protection

• Reduces annual repair costs

• Develop and refine flood protection projects for future

funding opportunities

• Regional and Intermediate project design and

construction

• Regulatory compliance

• Environmental protection and restoration

• Reduce community flood risk costs and impacts

17

Assessment Options

18

-

-

Program Revenue

• Original Stormwater Assessment Ordinance adopted in 1989

• Currently funds capital and water quality

• Historically supplemented by the General Fund, Community Investment Tax (CIT), and Grants

• Current rate method:

• Residential one size fits all

• Commercial cost per square foot impervious

After

Pipe Replacement Pipe Rehab

Before

19

• Updated Rate Method

• Full Program Cost Recovery

• Sustainable Level of Service (maintenance & capital)

Assessment Options

20

Rate Methods

Impervious Area ≈ 1,415 ft²

• Current Rate Method : Based on assumed 1,800 ft² average impervious area on residential lot (Est. 1990).

• Updated Rate Method : Based on actual 4,267 ft² average impervious area on residential lot and tiered sizes.

Small Medium Large

Impervious Area ≈ 3,200 ft² Impervious Area ≈ 5,120 ft²

21

Method Revenue Source Comparison UPDATED METHOD

(ACTUAL AVERAGE 4,267 FT²)

CURRENT METHOD

(ASSUMED AVERAGE 1,800 FT²)

Residential,

386,505,000 SF,

45%

Commercial,

475,569,951 SF,

55%

CURRENT METHOD REVENUE

Residential,

918,186,416 SF,

66%

Commercial,

475,569,951 SF,

34%

UPDATED METHOD REVENUE

Residential,

$12,841,584

54%

Commercial,

$11,096,694 ,

46%

Residential,

$17,172,776,

73%

Commercial,

$6,226,435,

27%

,

22

Full Program Cost Recovery

CURRENT FUNDING SOURCES PROPOSED FUNDING SOURCES Stormwater

$43.4 Million $43.4 Million Assessment,

$21.9M, 50%

3%

Grants, $1.5M,

Grants,

$1.5M, 3%

Unincorporated

General Fund,

$20M, 46%

Stormwater

Assessment,

$41.9M, 96%

23

Residential Assessment Options

Existing Number of Updated Revenue Method Households Method Neutral Rate

$31.43 per year

$57.15 per year

$87.44 per year

-$10.57

+$15.15

+$45.44

32,697

153,402

27,845

$42 per year

Small

Medium

Large

Rate Equity

24

Residential Assessment Options

Existing Number of Updated Full Cost Full Cost Method Households Method Recovery Recovery Rate

+$25.55

+$46.44

+$71.06

$56.98 per year

$103.59 per year

$158.50 per year

-$10.57

+$15.15

+$45.44

32,697

153,402

27,845

$42 per year

Small

Medium

Large

Reduce General Fund

Expense Rate Equity

25

Residential Assessment Options

Existing Number of Updated Full Cost Additional Rate

Method Households Method Recovery Maintenance

+$25.55

+$46.44

+$71.06

+$15.31

+$27.83

+$42.58

$72.29 per year

$131.42 per year

$201.08 per year

-$10.57

+$15.15

+$45.44

32,697

153,402

27,845

$42 per year

Small

Medium

Large

Increased Level of Service

Reduce General Fund

Expense Rate Equity

26

Residential Assessment Options

Existing Number of Updated Full Cost Additional Additional Sustainable Method Households Method Recovery Maintenance Capital Rate

Present Future

+$34.00

+$61.81

+$94.57

+$15.31

+$27.83

+$42.58

+$25.55

+$46.44

+$71.06

-$10.57

+$15.15

+$45.44

32,697

153,402

27,845

$42 per year

Small

Medium

Large

$106.28 per year

$193.23 per year

$295.66 per year

Increased Level of Service

Reduce General Fund

Expense Rate Equity

Life Cycle High Risk Pipes

27

Commercial Assessment Options

Actual Existing Updated Revenue Impervious Method Method Neutral Rate

Area (ft²)

$107.15 per year

$200.91 per year

$267.88 per year

Rate Equity

$186.87 per year

$350.00 per year

$466.67 per year

8,000

15,000

20,000

-$79.72

-149.09

-$198.79

28

Commercial Assessment Options

Actual Existing Updated Full Cost Full Cost Impervious Method Recovery Rate Method Recovery Area (ft²)

+$87.07

+$163.26

+$217.68

$194.22 per year

$364.17 per year

$485.56 per year

Reduce General Fund

Expense Rate Equity

$186.87 per year

$350.00 per year

$466.67 per year

8,000

15,000

20,000

-$79.72

-149.09

-$198.79

29

Commercial Assessment Options

Actual Existing Updated Full Cost Additional Impervious Rate Method Method Recovery Maintenance Area (ft²)

+$52.88

+$97.41

+$130.81

+$87.07

+$163.26

+$217.68

$247.10 per year

$461.58 per year

$616.37 per year

Increased Level of Service

Reduce General Fund

Expense Rate Equity

$186.87 per year

$350.00 per year

$466.67 per year

8,000

15,000

20,000

-$79.72

-149.09

-$198.79

30

Commercial Assessment Options

Actual Existing Updated Full Cost Additional Additional Sustainable Impervious Method Method Recovery Maintenance Capital Rate

Present Future Area (ft²)

$186.87 per year

8,000 -$79.72 +$87.07 +$52.88 +$117.44 $364.54 per year

+$216.34

+$290.52

+$97.41

+$130.81

+$163.26

+$217.68

$677.92 per year

$906.89 per year

Increased Level of Service

Reduce General Fund

Expense Rate Equity Life Cycle

High Risk Pipes

$350.00 per year

$466.67 per year

15,000

20,000

-149.09

-$198.79

31

Stormwater Assessment

• Original Stormwater Assessment Ordinance adopted in 1989.

• Notification processing, rate hearing in August.

32

Residential Rate Comparison

Annual Residential Assessment - Medium Size Home

$300 $280

$250 $230

$200 Sustainable Rate : $193.23

$175

$187

$160 $160 $163 $163 $165

$150 $139 $143

$118 $120 $125

$100 $82 $91 $91 $95

$72

$50 $42 $47 $53

$58 $60

$-

1) Currently Effective Rates as of 10/1/2018;

2) Rates may not reflect Full Cost Recovery

33

Recommendations

34

• Incorporate tiered residential method

• Full cost recovery

• Increased level of service in maintenance

• Sustainable capital funding

7/8

8/7 10/16/19

5/1

Program Timeline

Public Hearing Public Hearing Rates Effective

Request

2019

10/1

2020

8/7 6/19

7/8

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OCT NOV DEC JULY AUG SEPT APRIL MAY JUNE

5/1

JAN FEB MAR

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OverviewSustainabilityPlanAssessmentOptionsRecommendations