Water System Source of Supply & Treatment Improvements

Client—City of Woodland, Washington

Gibbs & Olson provided pre-design, design, and construction phase services for improvements to Woodland’s water system. The project was necessary to provide the City with adequate water supply and treatment capacity as outlined in their Water System Plan. The project consisted of two parts; one included modifications to the City’s existing water treatment plant, and second was source of supply modifications. The source of supply phase of the project involved the City’s existing Ranney Well raw water pump station facility. Construction modifications included:

Three new vertical turbine pumps with variable frequency drive (VFD) controllers to replace two existing vertical turbine pumps. The new pumps provide 2,100 gallons per minute (gpm) of raw water from the Ranney Collector to the water treatment plant. With two pumps in operation (1,050 gpm each), the third pump provides redundant capacity. The new pumps allow flexibility at the water treatment plant when setting treatment unit flow.

Setting up temporary pumping to maintain raw water flow of up to 2 mgd (1,400 gpm) to the water treatment plant Electrical and control improvements to operate the new pumps

New piping, valves and fittings within the Ranney Collector and tied into the existing transmission line piping to the water treatment plant