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Surface-water/ground-water interaction along reaches of the Snake River and Henrys Fork, Idaho

Scientific Investigations Report 2004-5115

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Abstract

Declining water levels in the eastern Snake River Plain aquifer and decreases in spring discharges from the aquifer to the Snake River have spurred studies to improve understanding of the surface-water/ground-water interaction on the plain. This study was done to estimate streamflow gains and losses along specific reaches of the Snake River and Henrys Fork and to compare changes in gain and loss estimates to changes in ground-water levels over time. Data collected during this study will be used to enhance the conceptual model of the hydrologic system and to refine computer models of ground-water flow and surface-water/ground-water interactions. Estimates of streamflow gains and losses along specific subreaches of the Snake River and Henrys Fork, based on the results of five seepage studies completed during 2001?02, varied greatly across the study area, ranging from a loss estimate of 606 ft3/s in a subreach of the upper Snake River near Heise to a gain estimate of 3,450 ft3/s in a subreach of the Snake River that includes Thousand Springs. Some variations over time also were apparent in specific subreaches. Surface spring flow accounted for much of the inflow to subreaches having large gain estimates. Several subreaches alternately gained and lost streamflow during the study. Changes in estimates of streamflow gains and losses along some of the subreaches were compared with changes in water levels, measured at three different times during 2001?02, in adjacent wells. In some instances, a strong relation between changes in estimates of gains or losses and changes in ground-water levels was apparent.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Surface-water/ground-water interaction along reaches of the Snake River and Henrys Fork, Idaho
Series title:
Scientific Investigations Report
Series number:
2004-5115
Edition:
Online only
Year Published:
2005
Language:
ENGLISH
Description:
27 p. with 3 appendices online
Scale:
24000
Online Only (Y/N):
Y