Donohue and Associates, Inc. has been selected to perform the first hydraulic study of the city’s water system since 1989.

The Washington City Council approved the contract for the study during Monday’s meeting.

The study will cost the city $58,000.

Kevin Quaethem, water/wastewater superintendent, told the Board of Public Works in May the study will be paid for with savings from a recent Clay Street water tower project.

The study will be used to develop recommendation for a 15-year capital facilities plan. The analysis will be based on current and projected water demands, customer service guidelines, and computer distribution system hydraulic modeling results.

Additionally the study will include five demand scenarios for planning purposes. The plan will figure out the existing average day and maximum day demand for service. After that, projections will be made for maximum day demand in 2018, 2023 and 2028.

The city’s last hydraulic study was done in 1989, but the results haven’t been helpful for the current study.

“I couldn’t find a whole lot of information on it,” Quaethem said. “I’m not sure where the file is.”

Quaethem said several other water studies have been done, the most recent in 2006, and have produced one-page reports.

Donohue said the study would take 120 days.

In conjunction with the study, the board of public works discussed purchasing additional software recommended by Donohue. Quaethem said software will help the city plan and prepare better.

The software would cost an additional $5,000.