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 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


Phase 1Complete

Phase 1 CSO Collection System

58 major projects

$114,614,771

Phase 1 WWTP 14 major projects

$34,253,781

$148.9m


Phase 2

• 7 Storage tanks

• 1 Storage conduit

• 1 Parallel interceptor


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


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


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.


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


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


Modeling; the basis of any LTCP

A Conservative Model or

an Underestimating Model?

Both at the same time!

Old/existing model


Old/Existing LTCP Model

Nash-Sutcliffe Coefficient for

Original LTCP Model: 0.29

Score of 1 = Perfection


#3 New Data Driven Model

Nash-Sutcliffe Coefficient for

CHRS Model: 0.93


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


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


SAGE Plan

Smarter Alternative for a Greener Environment


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


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


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”

cso update - south bend, indianacso= combined sewer overflow ltcp=long-term control plan. annual...

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