When basements were flooding, 
Optimizer™ blew the roof off ROI.

Johnson County Wastewater (JCW) optimized its capital improvement plan for the Turkey Creek Basin and identified millions of dollars in cost savings.

Turkey Creek Basin, a suburban area where the collection system was under-capacity, suffered from sewer overflows, surcharging and basement backups under the 10-year design storm. The wastewater treatment plant was undersized for the design storm which has a peak flow of 61 million gallons per day.

LOCATION:

Johnson County Wastewater

 

MISSION:

Collection System Master Plan Optimization

 

USE CASES:


KEY POINTS:

  • Evaluate wide range of improvement options to meet service levels
  • Balance conveyance and storage improvements against I/I reduction opportunities for best mix
  • Utilize existing model to quickly formulate Optimizer and develop least-cost solutions

“Optimatics helped us complete a comprehensive evaluation of options for the client facing costly regulatory-driven solutions to sewer overflow problems to identify what our client feels is the most cost-effective solution. The solution was millions of dollars less than what was previously identified through traditional trial and error alternative evaluations completed as a part of prior master planning projects.”

Tim Coleman
CH2M HILL Project Lead

Optimizer™ was used to identify capital improvements to remedy the current challenges. Rather than a traditional simulation approach, JCW chose to utilize optimization to develop a least-cost capital improvement plan. The resulting design needed to convey the 10-year, 24-hour design storm at proper velocities with no overflows and minimum surcharge. A multitude of improvement options were considered including relief sewers, storage, pump stations, force mains, wet weather treatment, and infiltration/inflow (I/I) reduction costs/benefits.

The optimized solution included new gravity sewer, expansion of a pump station, a new enhanced clarifier, and targeted percentages of I/I reduction for three of the 11 sub-basins. The solution was estimated to save nearly 20% of the cost of a traditional solution developed by simulation alone ($46.5M compared to $51M). Motivated by the results, JCW intends to use Optimatics’ optimization for its future basin planning efforts.

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INNOVATION IN I/I REDUCTION.
Reaching optimal cost-effectiveness took a novel approach:

  1. Estimating costs associated with various levels of I/I removal for each flow metered basin.
  2. Importing cost curves for each sub-basin’s I/I removal and cost rates for other improvement options into OptimizerTM WCS.
  3. Running complete hydraulic model simulations in a single optimization run evaluating thousands of configurations while calculating cost estimates and assessing hydraulic performance for thousands of options.
  4. Identifying the optimum solution to meet service level targets at the least cost.
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