CSO Update - South Bend, IndianaCSO= combined sewer overflow LTCP=long-term control plan. Annual...
Transcript of CSO Update - South Bend, IndianaCSO= combined sewer overflow LTCP=long-term control plan. Annual...
CSO Update
Annual Consultant and Contractors Meeting
South Bend - CSO LTCP
Long-term Control Plan; a plan to reduce the frequency and impact of emissions to the St. Joseph River from the City’s sewer in times of heavy rain.
CSO= combined sewer overflow
LTCP=long-term control plan
Annual Consultant and Contractors Meeting
Annual Consultant and Contractors Meeting4
LTCP
CSO Control Phase 1
WWTP
upgrades
Collection
system controls
Bendix
Eastbank
Diamond Avenue
Oliver Plow
Southwood
Kensington
CSO Control Phase 2
Storage
Tanks
Memorial Park
Old Fire
Station
Ice Rink
Parking Lot
Randolph &
Sampson
Nuner
Leeper Park
Brownfield
Park
Storage
Conduit
Parallel
Interceptor
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Phase 1Complete
Phase 1 CSO Collection System
58 major projects
$114,614,771
Phase 1 WWTP 14 major projects
$34,253,781
$148.9m
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Phase 2
• 7 Storage tanks
• 1 Storage conduit
• 1 Parallel interceptor
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Phase 2We needed to pause, regroup and rethink a better way to do Phase 2, because:
• Phase 2 will cost $713 million, without financing costs. When financing costs are included, the plan’s cost approaches one billion dollars—
Ten thousand dollars for every man, woman, and child in our city.
• Our median household income is 35% ($19.5K) below that of the rest of the nation. ($34K Vs $53K)
• Per capita income $19,626.
• 29.6% households have income <$20K
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The many issues with current LTCP Phase 2:
WWTP: Expansion challenges
WWTP: No tank, yet largest CSO
4 small tanks: GSI, Smart sewers,
Conveyance sewers can eliminate
Storage Conduit: Constructability concerns for available space, increased depth.
Parallel Interceptor: Would need to be deeper than existing, construction challenges due to river bank impact, river infiltration.
Far too oversized
tank capacity
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Progress
City-pioneered Smart Sewer initiative, has reduced combined sewer overflow to the river by 75%.
• From over 2 billion gallons annually to less than 500 million.
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Phase 1 successes: How did we do?
2111
1432
2054
1199
801890
445
715
410 399
705612
45
42
48
36.5
29.5
41.9
29.8
35.8
39.9
33.5
57.358.6
0
10
20
30
40
50
60
0
500
1000
1500
2000
2500
3000
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
INC
HES O
F R
AIN
OV
ER
FL
OW
MIL
LIO
N G
AL
LO
NS
Overflow Volume, MG Rain, IN Log. (Overflow Volume, MG)
Real Time Monitoring
System Implementation
Real Time Control
System Implementation
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Better Modeling- using real, gathered data.
CHRS:
Cognitive Hydraulic Response System
• Uses Artificial Intelligence to predict based on
past experiences.
• Then linked to a water quality model.
• Built in SWMM (which is a standard water
quality model, this is beneficial to us).
Less assumptions,
More facts
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Modeling; the basis of any LTCP
A Conservative Model or
an Underestimating Model?
Both at the same time!
Old/existing model
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Old/Existing LTCP Model
Nash-Sutcliffe Coefficient for
Original LTCP Model: 0.29
Score of 1 = Perfection
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#3 New Data Driven Model
Nash-Sutcliffe Coefficient for
CHRS Model: 0.93
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New Data Driven Model; another example
CHRS:
Cognitive Hydraulic Response System
• Uses Artificial Intelligence to
create a self-learning, self-
calibrating hydraulic model.
• Built in SWMM
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LTCP update- how we were able to change
Sewer sensors + time = system knowledge
System knowledge informing model with real data (CHRS data)
Real Data (CHRS data) + Optimization modelling x 10,000’s runs (via OptiSWMM)
Next Generation Data Driven alternative
Smarter Alternative for a Greener Alternative
Plus Green
stormwater
Infrastructure
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SAGE Plan
Smarter Alternative for a Greener Environment
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Plan comparisons
Plan Criteria Current Conditions
Currently
mandated LTCP SAGE LTCP*
Green Infrastructure (#CSO basins) 0 0 9
No. CSO storage Tanks 0 7 3
Total Storage Volume (MG) 0 24.4 13.4
Captures at least 85% of wet weather combined
sewage volume per year YES (89%) YES (96%) YES (96%)
WWTP capacity (MG/D) 77 100 100
Number of Overflows 99 13 10 (AVG 5.6)
WWTP CSO Storage tank NO NO YES
Consolidation Sewer (ft) 0 44800 17000
Cost to implement LTCP $0 >$713M $200M
Residential Indicator % (<1 low, 1-2 mid, > 2 high) N/A 3.69 2.12
*Smarter Alternative for a
Greener Environment
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Meetings with Regulators
Meetings have been held in South Bend, Indianapolis and Chicago.
Smart Sewer Tour by Regulators.
South Bend continuing to submit data as part of our renegotiation
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The Regulators
Successes so far-
“the EPA and IDEM strongly encourage South Bend’s efforts to develop a less expensive LTCP”
“(South Bend has) pursued an innovative approach by installing over 100 smart sensors in its sewer system”