State and local water-resource managers in Lower Skagit/Samish Water Resource Inventory Area (WRIA-3) face two water-availability issues that are common throughout Washington State. First, they must reserve water for domestic wells that are exempt from the water rights system without harming river and stream ecosystems in the lower Skagit River basin. Skagit County, which would be responsible for implementing the proposed reservation rules through land-use management, requires a scientifically credible basis for allocating reservations of any size. Second, water managers need to determine where ground-water pumping between the Skagit and Samish basins should be regulated as part of the Skagit River instream-flow regulations.
9722-CK4 - Potential Effects of Increased Ground-Water Withdrawals on Streamflows in the Lower Skagit River Basin, Skagit County, Washington - Completed FY2010
Problem - State and local water-resource managers in the Lower Skagit/Samish basin face two water-availability issues that are common throughout Washington State. First, they must reserve water for domestic wells that are exempt from the water rights system without harming river and stream ecosystems in the lower Skagit River basin. Skagit County, which would be responsible for implementing the proposed reservation rules through land-use management, requires a scientifically credible basis for allocating reservations of any size. Second, water managers need to determine where ground-water pumping between the Skagit and Samish basins should be regulated as part of the Skagit River instream-flow regulations.
Objectives - This study has two primary objectives. The first objective is to evaluate the effects of potential ground-water withdrawals and consumptive use on streamflow in four tributary subbasins (the East Fork and mainstem of Nookachamps Creek, Fisher Creek, and Carpenter Creek). The second objective is to determine to the extent possible the location of the ground-water divide between the lower Skagit and Samish Rivers for the purposes of identifying areas where wells would be subject to reservations under the Skagit River instream-flow rule.
Relevance and Benefits - This study is consistent with the national USGS mission and goals and to water-resource issues identified in the Center's Science Plan. The study addresses surface-water and ground-water interactions as related to water-resource management, which is a priority issue for both the Strategic Directions of the Water Resources Division 1999-2008 and the Washington Water Science Center's Science Plan. The methods developed for this study will benefit other areas of Washington because of the widespread need to reserve water for domestic uses while maintaining streamflow to protect ecosystems.
Approach - The study has two components: 1) development of a numerical model to assess the effects of ground-water pumping on streamflow in four tributaries to the lower Skagit, and 2) construction of seasonal water-table maps for the area between the Skagit and Samish Rivers.
Below are publications associated with this project.
Numerical simulation of the groundwater-flow system in tributary subbasins and vicinity, lower Skagit River basin, Skagit and Snohomish Counties, Washington
Shallow Groundwater Movement in the Skagit River Delta Area, Skagit County, Washington
Hydrographs Showing Ground-Water Level Changes for Selected Wells in the Lower Skagit River Basin, Washington
Hydrogeologic Framework, Groundwater Movement, and Water Budget in Tributary Subbasins and Vicinity, Lower Skagit River Basin, Skagit and Snohomish Counties, Washington
Below are partners associated with this project.
- Overview
State and local water-resource managers in Lower Skagit/Samish Water Resource Inventory Area (WRIA-3) face two water-availability issues that are common throughout Washington State. First, they must reserve water for domestic wells that are exempt from the water rights system without harming river and stream ecosystems in the lower Skagit River basin. Skagit County, which would be responsible for implementing the proposed reservation rules through land-use management, requires a scientifically credible basis for allocating reservations of any size. Second, water managers need to determine where ground-water pumping between the Skagit and Samish basins should be regulated as part of the Skagit River instream-flow regulations.
9722-CK4 - Potential Effects of Increased Ground-Water Withdrawals on Streamflows in the Lower Skagit River Basin, Skagit County, Washington - Completed FY2010
Problem - State and local water-resource managers in the Lower Skagit/Samish basin face two water-availability issues that are common throughout Washington State. First, they must reserve water for domestic wells that are exempt from the water rights system without harming river and stream ecosystems in the lower Skagit River basin. Skagit County, which would be responsible for implementing the proposed reservation rules through land-use management, requires a scientifically credible basis for allocating reservations of any size. Second, water managers need to determine where ground-water pumping between the Skagit and Samish basins should be regulated as part of the Skagit River instream-flow regulations.
Objectives - This study has two primary objectives. The first objective is to evaluate the effects of potential ground-water withdrawals and consumptive use on streamflow in four tributary subbasins (the East Fork and mainstem of Nookachamps Creek, Fisher Creek, and Carpenter Creek). The second objective is to determine to the extent possible the location of the ground-water divide between the lower Skagit and Samish Rivers for the purposes of identifying areas where wells would be subject to reservations under the Skagit River instream-flow rule.
Relevance and Benefits - This study is consistent with the national USGS mission and goals and to water-resource issues identified in the Center's Science Plan. The study addresses surface-water and ground-water interactions as related to water-resource management, which is a priority issue for both the Strategic Directions of the Water Resources Division 1999-2008 and the Washington Water Science Center's Science Plan. The methods developed for this study will benefit other areas of Washington because of the widespread need to reserve water for domestic uses while maintaining streamflow to protect ecosystems.
Approach - The study has two components: 1) development of a numerical model to assess the effects of ground-water pumping on streamflow in four tributaries to the lower Skagit, and 2) construction of seasonal water-table maps for the area between the Skagit and Samish Rivers.
- Publications
Below are publications associated with this project.
Numerical simulation of the groundwater-flow system in tributary subbasins and vicinity, lower Skagit River basin, Skagit and Snohomish Counties, Washington
A groundwater-flow model was developed to evaluate the effects of potential groundwater withdrawals and consumptive use on streamflows in tributary subbasins of the lower portion of the Skagit River basin. The study area covers about 155 square miles along the Skagit River and its tributary subbasins (East Fork Nookachamps Creek, Nookachamps Creek, Carpenter Creek, Fisher Creek) in southwestern SkAuthorsKenneth H. Johnson, Mark E. SavocaShallow Groundwater Movement in the Skagit River Delta Area, Skagit County, Washington
Shallow groundwater movement in an area between the lower Skagit River and Puget Sound was characterized by the U.S. Geological Survey to assist Skagit County and the Washington State Department of Ecology with the identification of areas where water withdrawals from existing and new wells could adversely affect streamflow in the Skagit River. The shallow groundwater system consists of alluvial, lAuthorsMark E. Savoca, Kenneth H. Johnson, Elisabeth T. FasserHydrographs Showing Ground-Water Level Changes for Selected Wells in the Lower Skagit River Basin, Washington
Hydrographs for selected wells in the Lower Skagit River basin, Washington, are presented in an interactive web-based map to illustrate monthly and seasonal changes in ground-water levels in the study area. Ground-water level data and well information were collected by the U.S. Geological Survey using standard techniques and were stored in the USGS National Water Information System (NWIS), Ground-AuthorsE.T. Fasser, R. J. JulichHydrogeologic Framework, Groundwater Movement, and Water Budget in Tributary Subbasins and Vicinity, Lower Skagit River Basin, Skagit and Snohomish Counties, Washington
A study to characterize the groundwater-flow system in four tributary subbasins and vicinity of the lower Skagit River basin was conducted by the U.S. Geological Survey to assist Skagit County and the Washington State Department of Ecology in evaluating the effects of potential groundwater withdrawals and consumptive use on tributary streamflows. This report presents information used to charactAuthorsMark E. Savoca, Kenneth H. Johnson, Steven S. Sumioka, Theresa D. Olsen, Elisabeth T. Fasser, Raegan L. Huffman - Partners
Below are partners associated with this project.