With a population of approximately 83,000, Sioux City, Iowa, has a complex water collection, treatment, and distribution system that contains six different pressure zones. In addition, the city provides several adjacent communities with domestic water supply and/or back-up water supply. Olsson Associates has been a significant contributor to making sure its water system is running as efficiently as possible.
Water System Master Plan
Olsson Associates was involved in preparing the previous Sioux City Water System Master Plan, which was completed in March 2001. Since that time, many improvements have been made to the system, and, as with all communities, growth and planning projections have changed from those anticipated in the Master Plan. These changes warranted an update of the Master Plan.
The city retained Olsson to perform the updates to the Master Plan, including reviewing existing information pertaining to the system’s supply, treatment, storage, and distribution. Other tasks included projecting population and water usage for the next 20 years, evaluating water supply and treatment options to increase capacity and quality, and converting the city’s current KY Pipe model to H20 Net. Olsson also performed computer analysis and simulations for interconnections with other communities, developed a Master Plan improvements program, and prepared preliminary and final reports to summarize the study’s findings and recommendations. The city began implementing the recommended improvements upon receiving the approved plan.
Southbridge Water Treatment Plant Horizontal Collector Well Design
In 2008, Olsson and Black & Veatch were selected to provide updates to the city’s Southbridge Water Treatment Plant. These updates included designing a new horizontal collector well (HCW), a new 20-million-gallons-of water-a-day (MGD) treatment plant, and 20,000 linear feet of 36-inch raw and finished water main. Olsson was involved in all project aspects, and provided the HCW and 36-inch water main designs, which had a combined budget of $10.5 million. The project’s construction was completed in 2011.