SL-RAT at Little Rock Water Reclamation Authority

Little Rock looked to enhance their sophisticated cleaning program and reduce sanitary sewer overflow count by implementing new technologies.

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LRWRA User

Transitioning to a Condition-Based Cleaning Program

With a time-based maintenance program, Little Rock annually serviced 40% of their small diameter collection system using high-cost resources such as CCTV or cleaning. Some of these serviced segments had plenty of flow capacity, while blockages in other parts of the system were missed and causing overflows. Despite having a highly sophisticated cleaning program, Little Rock looked to enhance their program and reduce sanitary sewer overflow count.

“Condition-based cleaning strategy has added meaning to the operators’ daily tasks.”

– Tim Harrison, Program Supervisor – Asset Management, LRWRA

Comparison of SSOs to % of System Inspected at LRWRA

  • SSO Count
  • % of System Inspected

Condition-Based Cleaning Reduces overflow count by 64%

In January 2017, Little Rock launched their acoustic program to rapidly screen their small diameter pipes for blockages. They focused high cost resources such as cleaning and CCTV on the 20% of their system that received poor acoustic scores. By deploying resources based on condition rather than time, Little Rock reduced time spent cleaning clean pipes. Without increasing personnel count, they reduced sanitary sewer overflow count by 64%.

View Case Study

Cleaning Less, Removing More

With a condition-based maintenance strategy, Little Rock cleaned 32% fewer linear feet and reduced time spent cleaning by 21%. However, they increased debris removed by 116%. Spending less time to remove significantly more debris from their system proved that resource deployment is more effective under a condition-based cleaning strategy.

21% Reduction in man hours

2016 (32,036 man hours)
2017 (25,234 man hours)

32% Reduction in feet cleaned

2016 (2.27 million lf)
2017 (1.54 million lf)

117% Increase in debris removed

2016 (36 cubic yards)
2017 (78 cubic yards)

Little Rock Reclamation Authority Resources

Little Rock One Pager (2019)

View one page synopsis of Little Rock’s program results here.

Little Rock Case Study (2019)

View Little Rock’s Case Study (3 pages) here. (English Version)

Case Study in Portuguese here.

WEFTEC Paper (2018)

RATs in the House – How Little Rock Water Reclamation Authority Moved from a Time-Based to a Condition-Based Sewer Cleaning Strategy.

Authors: Tim Harrison, LRWRA & Alex Churchill, InfoSense

See full paper (13 pages) here.

WEFTEC Presentation (2018)

RATs in the House – How Little Rock Water Reclamation Authority Moved from a Time-Based to a Condition-Based Sewer Cleaning Strategy.

Presenters: Tim Harrison, LRWRA & Alex Churchill, InfoSense

See full presentation here.