stormwater data project & 2017 whitepaper · scwc 2017 stormwater workshop initial...
TRANSCRIPT
SCWC 2017 Stormwater Workshop
STORMWATER DATA PROJECT &
2017 WHITEPAPERMiluska Propersi | MWDLee Alexanderson | LACFCDOctober 11, 2017
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
Initial understanding of stormwater cost per AF
Consisted mainly of conceptual stormwater projects
Findings presented to water and regulatory agencies
BACKGROUND | 2012 WHITEPAPER
SCWC 2017 Stormwater Workshop
APPROACH | WHITEPAPER DEVELOPMENT
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
STORMWATER DATA PROJECT
SCWC 2017 Stormwater Workshop
Outreach to 30 agencies
Received over 50 projects across the region
Collaborated extensively
Identified data collection challenges
DATA COLLECTION | AGENCIES CONTACTED
SCWC 2017 Stormwater Workshop
DATA REVIEW | ASSESSED DATA
Actual Capture Data
Full Yearof Data
Actual Construction
Costs
3254 Projects Received
32 Projects with Complete Data
SCWC 2017 Stormwater Workshop
DATA SET | 32 PROJECTS ANALYZED
29 Centralized 3 Distributed
25 Retrofit/Rehabilitation 4 New 3 New
SCWC 2017 Stormwater Workshop
LOCATION | ACROSS SOUTHERN CALIFORNIA
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
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)
SCWC 2017 Stormwater Workshop
Water Supply27 projects
Flood Risk Mitigation2 projects
Water Quality3 projects
DATA SET | PRIMARY PROJECT BENEFITS
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
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)
SCWC 2017 Stormwater Workshop
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
$132 million in 2017$
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
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
)
SCWC 2017 Stormwater Workshop
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
)
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
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
SCWC 2017 Stormwater Workshop
Lee Alexanderson, P. E.626.458.4370 | [email protected]
Miluska Propersi, P. E.213.217.6963 | [email protected]
Questions?