A Comprehensive Approach to Storm

Water Asset Management Planning

Steve McLaughlin, PE

April 2016

City of Virginia Beach – Public Works Operations

Agenda

City of Virginia Beach, VA

• Population: 450,000

• 250 Square Miles

• 1,200 miles Pipe

• 5,000 outfalls (1/2 to Chesapeake Bay)

• 160 miles Off Road Ditches

• 450 miles Roadside Ditches

• 15 Pump Stations

• 776 Lakes to inspect; 491 Lakes to maintain

• 58 Dams/Spillways

FY17 Proposed Revenue

• ERU Daily Fee = $0.433

• ERU Annual Fee = $158.48

• ERU’s (FY 17) = 248,723

• SWU Generates $39,417,213 Annually

ERU = Equivalent

Residential Unit

Stormwater Fee,

$39,417,213

Other, $442,470

Storm Water Debt

Debt Amount Interest RateDebt Service

Payments (FY17)

2010B Storm

Water Revenue

Refunding

Bonds

$ 4,530,000 2.597% $641,581

2010A Storm

Water Revenue

Bonds

$17,295,000 3.238% $1,391,695

2015 Storm

Water Revenue

Bonds

$22,270,000 2.829% $1,359,106

Total $44,095,000 $3,392,383

Storm Water FY 2017-22 Funding

Operations & Maintenance

$88.6 M65%

Water Quality$18.1 M

13%Flood Control

$29.5 M22%

Storm Water FY 2017-22

Requested Program – O&M

Project CIP FY 2017-22

Total Budget

7416000 SW Infrastructure Rehabilitation & Improvements II 56,172,866 34,300,000

7026000 Residential Drainage Cost Participation Program II 450,000 300,000

7023000 Primary System Infrastructure Improvements II 17,430,000 13,620,000

7411000 Oceanfront Storm Water Facilities Maintenance 5,708,000 4,500,000

7412000 Stormwater Pump Station Modifications 7,416,889 5,000,000

7415000 Lake Management II 47,031,404 29,985,912

7034000 Stormwater Operations Modular Building 890,000 400,000

7200000 Severe Repetitive Loss Grant Program 1,847,009 0

7032000 Flood Mitigation Assistance Grant Program 1,227,144 0

Report Total 138,173,312 88,105,912

GovMax V5 1/12/2016

Program Background

Storm Water CIP Section O&M

7-416 SW Infrastructure Rehabilitation

& Improvements II

Neighborhood Pipe Rehabilitation Accomplishments:

Neighborhood Constr. Cost Phase

Princess Anne Plaza FY13 $5.5M Complete

Aragona FY14 $2.8M Complete

Green Run FY15/16 $2.8M Complete

Glenwood FY16 $1.8M Construction

Pine Ridge/Hunt

Club/Middle

Oaks/Strawbridge

FY17 $1.1M Construction

Kings Grant FY17 $2M Design

Total: $16M

Neighborhood Constr. Cost Est.

Magic Hollow FY17 $2M 1970s

Fairfield FY18 $2M 1970s

Southgate FY18 $1M 1980s

Ocean Lakes FY19 $2M 1980s

Windsor Woods FY19 $2M 1960s

Indian Lakes FY20 $2M 1970s

Salem Woods FY20 $2M 1980s

Salem Lakes FY21 $1M 1980s

Red Mill Farms FY21 $2M 1980s

Lagomar FY21 $1M 1980s

Malibu FY22 $1M 1960s

Foxfire FY22 $1M 1990s

Courthouse

Estates FY22 $2M 1990s

Upcoming Neighborhood Pipe

Rehabilitation Projects:

7-416 SW Infrastructure

Rehabilitation & Improvements II - $5.5M

Current/Completed Major

Neighborhood Rehabs:

Neighborhood Constr. Cost Phase

Princess Anne Plaza FY13 $5.5M Complete

Aragona FY14 $2.8M Complete

Green Run FY15/16 $2.8M Complete

Glenwood FY16 $1.8M Construction

Pine Ridge/Hunt Club/

Middle Oaks/StrawbridgeFY17 $1.1M Construction

Kings Grant FY17 $2.0M Design

Magic Hollow FY17 $2.0M CCTV

Total: $18M

Green Run Pipe Lining

Green Run Pole Grouting

Program Overview

1. Methodology

4. Apply 2. Implement

3. Results

Goals

Pro

babili

ty o

f F

ailu

re

Consequence of Failure

RISK BASED

Methodology

Citizens

Cave-In Notification Methods

City StaffOther Projects

MethodologyPrioritization Score Factors

Above Ground

Defect Codes

Pavement

Condition

Surface

Condition

Defect

Correlation

Structure

Interface

MethodologyPrioritization Score Factors

Risk

Modifiers

Roadway

Type

RoadwayType

Pipe

Material

Pipe

Size

Geographic

MethodologyPrioritization Score Factors

Descriptor Modifier Risk Modifier

Roadway

Arterial

Collector

Local

5

4

3

Geographical

Tidal Influence

School

Park

Sidewalk

3

5

5

3

Pipe Diameter

<18”

18” – 48”

>48”

1

3

5

Pipe Material

RCP

CMP

CHDPE

1

5

5

MethodologyRisk Modifiers

Risk Modifier

Descriptor Modifier Risk Modifier

Roadway

Arterial

Collector

Local

5

4

3

Geographical

Tidal Influence

School

Park

Sidewalk

None

3

5

5

3

1

Pipe Diameter

<18”

18” – 48”

>48”

1

3

5

Pipe Material

RCP

CMP

CHDPE

1

5

5

MINIMUM TOTAL RISK MODIFIER 6

MethodologyPrioritization Threshold

Variable Grade Modifier

Defect

GradeModifier

Effective

Grade

1 1 1

2 3 6

3 10 30

4 30 120

5 90 450

Prioritization Threshold, 2,700 = (Min. Grade 5 Effective Grade, 450) x (∑ Risk Modifiers, 6)

Methodology

Quantitative Risk Analysis

Improvement Prioritization

Risk Threshold

Methodology

Green Run

100,000 LFT

Glenwood

105,000 LFT

Pine Ridge

40,000 LFT

Implementation

Implementation

Above Ground

Defect Codes

Field 2-Person Crew Document

Defects

Immediate

Concerns

Daily

Record

Implementation

Cave-in Failure Factors

Office - CCTV Reviewers In-House

Review Software

Document

Defects

Preliminary

Repair Methods

Implementation

Implementation

Risk

Modifiers

Office/Field GIS Data Field

Observation

Institutional

Knowledge

Preliminary

Repair Methods

Cured in Place Pipe

Hole

Lift hole with deterioration

Broken

Existing Point repair –

Poor Condition

Implementation

No Rehab

Minor Roots

Infiltration

Existing Point repair –

Good Condition

Grout

Joint Offset/Separation

Moderate to Severe

Roots

Deposits Settled Fine

Deposits Ingress

Results by Rehabilitation Method

∑ Segment Costs

75% of CIPP

(Lining Cost)

Full Length CIPP

(Lining)

ALL 3 BASINS

TypeTotal Number of

AssetsTotal Length (FT)

Grouting 248 42,591

Segmental Lining 184 30,404

Full Length CIPP Lining 242 22,349

Results Of Assets By BasinP

robabili

ty o

f F

ailu

re

Consequence of Failure

Results Summary – All 3 Basins

Rehabilitation

Glenwood

29,693 LFT

At Construction

Rehabilitation

Pine Ridge

10,297 LFT

At Construction

Condition AssessmentKings Grant37,000 LFT

At Design

What’s Happening Now?

Benefits Of Program

• Reduce Cave-ins and Improve Safety

• Extend Useful Life of Assets

• Defendable, Analytical Approach

• Efficient Use of Capital Funding to Stretch Public

Funding

THANK YOU…

Steve McLaughlin, PE

City of Virginia Beach – Public Works Stormwater Operations Manager

757.385.1470

SMcLaugh@vbgov.com

QUESTIONS?