stormwater data project & 2017 whitepaper · scwc 2017 stormwater workshop initial...

SCWC 2017 Stormwater Workshop

STORMWATER DATA PROJECT &

2017 WHITEPAPERMiluska Propersi | MWDLee Alexanderson | LACFCDOctober 11, 2017


PURPOSE | 2017 WHITEPAPER

Regional CollaborationRegional

Collaboration

Constructed Projects Database

Constructed Projects Database

Standardized Data

Standardized Data

Capture & Cost

Analysis

Capture & Cost

Analysis

Present stormwater project performance data, identify data gaps and challenges, and highlight lessons learned to inform stormwater discussions

Basis for Next StepsBasis for

Next Steps


Initial understanding of stormwater cost per AF

Consisted mainly of conceptual stormwater projects

Findings presented to water and regulatory agencies

BACKGROUND | 2012 WHITEPAPER


APPROACH | WHITEPAPER DEVELOPMENT


NEXT STEPS | 2017 WHITEPAPER

Schedule

Mid October » Release of draft 2017 Whitepaper

Last chance to submit actual stormwater data!

Welcome reviewers from all sectors!

Early 2018 » Finalize 2017 Whitepaper


STORMWATER DATA PROJECT


Outreach to 30 agencies

Received over 50 projects across the region

Collaborated extensively

Identified data collection challenges

DATA COLLECTION | AGENCIES CONTACTED


DATA REVIEW | ASSESSED DATA

Actual Capture Data

Full Yearof Data

Actual Construction

Costs

3254 Projects Received

32 Projects with Complete Data


DATA SET | 32 PROJECTS ANALYZED

29 Centralized 3 Distributed

25 Retrofit/Rehabilitation 4 New 3 New


LOCATION | ACROSS SOUTHERN CALIFORNIA


Type/Size* New RetrofitSpreadingGrounds

Centralized

> 1,000 AFY 9

100 – 1,000AFY 1 13

10 ‐ 100 AFY 1 2

< 10 AFY 2 1

Distributed

10 ‐ 100 AFY 2

< 10 AFY 1

DATA SET | PROJECT SIZE SUMMARY

*Based on Planned Annual Average Captured


Type/Size New Retrofit*SpreadingGrounds

Centralized

> $10 million 1 2

$1 – $10 million 1 18

< $1 million 2 5

Distributed

$1 – $10 million 2

< $1 million 1

DATA SET | CAPITAL COST SUMMARY

*Based on cost of the retrofit only (not total spreading ground cost)


Water Supply27 projects

Flood Risk Mitigation2 projects

Water Quality3 projects

DATA SET | PRIMARY PROJECT BENEFITS


0

5

10

15

20

25

30

35

2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Num

ber o

f Pro

jects

DATA SET | PROJECT COMPLETION


DATA ANALYSIS | CAPTURE & PRECIPITATION

0

5

10

15

20

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

Prec

ipita

tion

(inch

es)

Stor

mwa

ter C

aptu

red

(AFY

)

Total Captured (AFY) Precipitation (inches)


Average Stormwater Captured

WY 2006‐16 From 32 projects

DATA SET | SUMMARY

13,000 AFY

10”

Average Rainfall

WY 2006‐16 Below Long‐term

Average of 15.2”

Average Construction Cost

$132 million in 2017$


DATA ANALYSIS | CAPTURE VERSUS COST

1Capital costs amortized over 30 years2Includes capture by the entire spreading grounds (does not isolate the marginal capture of the retrofit)

$0

$1

$10

$100

$1,000

$10,000

$100,000

$1,000,000

0 1 10 100 1,000 10,000

Annu

al Co

st p

er A

F Ca

ptur

ed ($

/AFY

) 1

Average Stormwater Captured (AFY)

Centralized Projects – Retrofit 2

Centralized Projects ‐New Distributed Projects ‐New


DATA ANALYSIS | CENTRALIZED PROJECTS

1Capital costs amortized over 30 years2Includes capture by the entire spreading grounds (does not isolate the marginal capture of the retrofit)

$-

$5,000

$10,000

$15,000

$20,000

$25,000

$30,000

PlannedCentralized

Retrofit

ActualCentralized

Retrofit

PlannedCentralized

New

ActualCentralized

New

Annu

al Co

st p

er A

F Ca

ptur

ed ($

/AFY

)


DATA ANALYSIS | DISTRIBUTED PROJECTS

1Capital costs amortized over 30 years

$-

$50,000

$100,000

$150,000

$200,000

$250,000

$300,000

PlannedDistributed

ActualDistributed

Annu

al Co

st p

er A

F Ca

ptur

ed ($

/AFY

)


DATA CHALLENGES | COMMON PROBLEMS

Actual Flow Data

• No monitoring

• Technical difficulties

• Difficult to isolate benefits from retrofit projects

Actual Cost Data

• Difficult to isolate stormwater costs

• O&M costs are averaged over time

• Historical costs difficult to obtain


Retrofit Projects tend to be more cost effective than new projects

Distributed Projects primary purpose may not be water supply but have opportunities for partnerships

Monitoring is essential

SUMMARY | DATA ANALYSIS


ACKNOWLEDGEMENTS | THANK YOU

Data Submission

IEUA, LACFCD, LADWP, OCFCD, EMWD, San ElijoJPA, County of Ventura, Cities of Santa Monica and Torrance

Working Group

IEUA –Andy Campbell

HATCH – Pavitra Rammohan

MWD – Matthew Hacker, Stacie Takeguchi

SCWC – Rich Atwater


Lee Alexanderson, P. E.626.458.4370 | [email protected]

Miluska Propersi, P. E.213.217.6963 | [email protected]

Questions?

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