The Kennewick Irrigation District’s $5.3 million Kiona Intake and Booster Pump Station project is a new 6,300 gallon per minute (gpm) pump station and freshwater intake off the Yakima River. This is the first phase in an approximately $15.2 million construction project to bring irrigation water to the prestigious Red Mountain American Viticultural Area (AVA) region. The booster pump station will be the main supply source for the newly developed Red Mountain South LID irrigation system, which will serve 1,785 acres of irrigable lands where some of the region’s finest wine grapes are grown.
The pump station includes five vertical turbine pumps, with two 20 hp motors and three 300 hp motors, each equipped with variable frequency drives. Water from the pump station will be filtered to remove particles larger than 100 microns. This level of filtration is unique in comparison to other municipal irrigation systems where the owner typically assumes no responsibility for the water quality being delivered to the enduser.
The environmental permitting presented a number of challenges due to the site’s proximity to the Yakima River, which is a salmon bearing stream with other Endangered Species Act listed species. As a result, access to the river for construction of the intake structure is limited and confined to a narrow two-month window from mid-July to September. In addition, the topography of the site makes access extremely difficult, which is further complicated by the fact that the entire site is predominantly basalt bedrock. The project will need extensive rock blasting, excavation, structural earth retaining walls, and grading to prepare the site for the new facility. RH2 finalized the project for bid in April.