Wednesday, March 13, 2019
Venue: Luigi's Italian Restaurant, 245 W. Main, Spokane, WA. Tel: 509-624-5226
Social hour, 6:00 PM. Technical program, 7:00 PM.
Spokane Environmental Solutions presents
Estimating Future Domestic Home Water Needs Under RCW 90.94 in Rural Northeastern County Watershed, Stevens County, Washington
Gene St. Godard, PG, LHG, CWRE, Principal Hydrogeologist/Owner, WNR Group, Water Quality Program Manager, Washington Department of Health
The Colville River Watershed, Water Resource Inventory Area (WRIA) 59, is located within Stevens County in northeastern Washington. In 1977, the Washington State Department of Ecology, adopted an instream flow rule regulating the surface waters of WRIA 59 (Chapter 173-559 WAC). Over the past twenty years, Stevens County, in conjunction with other local governments, conservation district, tribes and citizens (referred to generally as the “WRIA 59 Planning Unit”) developed a Watershed Plan, conducted instream flow studies to determine if instream flow rule implemented in 1977 (WAC-173-559) should be modified, evaluated potential water storage projects, and developed a feasibility study for a water bank for promoting economic growth.
The Colville River Watershed is a 1,007-square mile area and lies in a generally north-south orientation. The Watershed is approximately 45 miles long and 23 miles wide and extends from near the towns of Springdale and Loon Lake at the southern (upstream) end of the basin to near the town of Kettle Falls at the northwestern (downstream) extent of the basin. The Colville River begins as Sheep Creek in the headwaters near Loon Lake, and flows in a generally northerly direction until the Colville River empties into the Columbia River at Lake Roosevelt, approximately 2 miles west of Kettle Falls.
The WRIA 59 Planning Unit, under the leadership of the Stevens County, has been collecting data within the mainstem and subbasins for over a decade. This data was used as the foundation for developing future water consumptive use estimates for the next 20-years. The basin contains three major aquifer systems: 1) A deep confined aquifer in the main Colville River Valley; 2) A shallow unconfined aquifer present in various areas on the main valley floor and the lower tributaries; and 3) the bedrock fractured aquifers located throughout the basin and tributaries.
The study included determining the potential subbasins which may have the highest impacts from the future building density. A key conclusion of the study revealed that the highest impact areas would be not where the highest density of future homes would be located in a certain subbasin, but the primary aquifer source for future homes.
Gene St. Godard is the owner and Principal Hydrogeologists of the Water & Natural Resource Group which he formed in 2004. He is a licensed professional geologist in five states (WA, ID, OR, CA, & WY), a licensed hydrogeologist (WA & CA), and a Certified Water Rights Examiner (WA & ID). Gene has 30 years of experience working in the natural resource field sand characterizing aquifers and surface water with regards to quantity and quality throughout northern Idaho and central and eastern Washington. He has completed numerous water resource studies throughout Washington and is experienced in conducting aquifer system studies, and water right extent and viability analyses for water rights management and transfers. Mr. St. Godard has extensive experience in managing large multi-disciplinary natural resource projects for resource planning and watershed assessments for public and private clients throughout the northwest. The WNR Group primarily represents agricultural, mining, and industrial clients in addition to county planning departments.