Optimization kept a citywide system running even if one plant stopped.

The Dayton and Montgomery County water agencies collaborated on a joint Water Efficiency Master Plan utilizing Optimizer™ to optimize multiple redundancy scenarios while minimizing life-cycle costs.

The City of Dayton Department of Water (the City) and Montgomery County Water Services (the County) needed to implement capital improvements to meet projected 2030 water demands and provide adequate redundancy for the combined City/County water system. This included evaluation of future source water facilities for baseline and emergency scenarios, as well as an overall objective to reduce overall energy and treatment costs.

LOCATION:

City of Dayton and Montgomery County, Ohio

 

MISSION:

Water Distribution Master Plan Optimization

 

USE CASES:


KEY POINTS:

  • Review and analyze system performance under various combination of source water options to unbiasedly determine the lowest cost solution
  • Determine least-cost pipe, storage and pump improvement scheme
  • Strengthen system redundancy
  • Modify operating strategies to optimize peak pumping, labor and chemical usage costs

“The purpose of the Water Efficiency Master Plan was to identify the most efficient manner that the City and the County could provide water to its customers over the next twenty years.  Through a combination of sophisticated modeling tools and engineering analyses, an optimized capital improvement program was developed that could provide the lowest cost for achieving the Plan goals.”

With an updated joint City/County hydraulic model, revised demand forecasts, and identified key redundancy scenarios to ensure reliable supply, Optimizer was formulated and run to consider a range of alternative infrastructure options, unit costs for improvements, operational costs, and hydraulic performance criteria for efficient system operation. The options included installation of new pipes or replacement/relining of selected existing pipes, new storage or expansion of existing storage at the same location, new pump stations or expansion of existing pump stations, identification of storage trigger levels for pump stations, expansion of existing treatment plants and opportunities to develop new treatment plants, reducing source water usage including abandonment of existing treatment facilities.

The project recognized current areas of concern including low pressure issues, locations with overstressed mains, and vulnerability uncertainties should a major supply be out of service. In addition, the optimization process included operational optimization for pump electricity usage, labor and chemical usage at the facilities.

Optimized projects identified for the joint City/County Water Efficiency Master Plan were segregated for funding and timing for the City and County. The total 20-year plan costs were fairly equal at just over $190 million for both the City and County.

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Two Optimization improvement scenarios. One clear winner.

The final optimized solutions, based on two water treatment plant operational situations, called for new pipe alignments and diameters as well as the replacement and relining of existing pipe in selected areas. The results showed these improved pipes overcame high head loss and low pressures problems while ensuring proper refill of existing storages.

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