The City of Goldendale’s Simcoe Springs is a snowmelt-derived source of exceptional-quality water; the source is already insufficient to meet the community’s growing demands year-round, and may be reduced in quantity during summer months by future climate change. Aspect helped the City assess expanded use of the critical supply source—storing surplus winter spring flows in an aquifer and pumping the water back for use in the summer (ASR). Our ASR feasibility study developed the information required for an ASR permit application as specified in Chapter 173-157 WAC. Based on our recommendations, the City applied for a new seasonal water right to divert additional Simcoe Springs water for ASR.
Aspect initiated the City of Kennewick’s ASR concept to reduce diversion from the Columbia River during peak demand/critical flow periods while optimizing their existing infrastructure, consistent with the Quad Cities Regional Water Supply Plan and the WRIA 31 Watershed Management Plan. We completed the ASR feasibility study that included three required elements for ASR permit application (Chapter 173-157 WAC): the hydrogeologic conceptual model, environmental assessment, and project monitoring plan. As a result, the City secured more than $1M in funding to undertake ASR pilot testing, which likely will lead to full-scale implementation.
Aspect assessed multipurpose water-storage options to increase irrigation water supply for the Horse Heaven Hills area—the agricultural center of WRIA 31 and an American Viticultural Area. We initially assessed 13 surface reservoir sites and, based on preliminary cost-benefits, we arrived at a preferred alternative of two in-channel surface reservoirs comprising approximately 100,000 acre-feet of storage capacity and 10,000 acre-feet of aquifer storage and recovery (ASR). The follow-on assessment retained Switzler Reservoir and demonstrated substantial public benefit by using the new water supply to mitigate impacts from new Columbia River water rights. The project involves diverse watershed stakeholders and is currently in SEPA review.
Like other parts of Washington State, water is not uniformly available throughout the year in the Klickitat River watershed (WRIA 30), which can create conflicts between water demands for fish versus people. Aspect completed the initial assessment of storage options for developing new agricultural and municipal water supplies within two priority subbasins of WRIA 30: Little Klickitat River and Swale Creek. We identified prospective storage options based on each subbasin’s physical characteristics, irrespective of water needs. From our assessment, the implementing agencies have initiated a more detailed feasibility study for one of the identified options, in-channel storage within Dry and Idlewild Creeks to achieve both instream and out-of-stream benefits, which Aspect is conducting.