Low-flow investigations

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Section: Constituent Load and Mass Balance Calculationsmentioning

confidence: 99%

Trace metal and nutrient loads from groundwater seepage into the South Fork Coeur d’Alene River near Smelterville, northern Idaho, 2017

Zinsser¹

2019

“…2; Simonds and Sinclair, 2002). The net change after accounting for the measured inflows and outflows is inferred to represent groundwater inflow to the stream (gain) or stream outflow to groundwater (loss) and is referred to in this report as the streamflow accrual from groundwater (Riggs, 1972). The same equation was used to calculate gains or losses of dissolved zinc, dissolved cadmium, and total phosphorus, where the calculated load was used in place of streamflow for each term in equation 2.…”

Section: Constituent Load and Mass Balance Calculationsmentioning

confidence: 99%

Trace metal and phosphorus loading from groundwater seepage into South Fork Coeur d’Alene River after remediation at the Bunker Hill Superfund Site, northern Idaho, 2022

Murray,

Zinsser

2023

“…Synoptic streamflow measurements can be used to determine flow interactions between surface water and groundwater in a river or stream. An increase (gain) or decrease (loss) in streamflow that is not attributed to surface-water inflows or outflows between measurement sites is inferred to indicate groundwater exchange (Riggs, 1972). Long reaches composed of multiple subreaches were used to determine surface-water/ groundwater interactions in the Big Lost River.…”

Section: Calculations Of Net Streamflow Gain or Lossmentioning

confidence: 99%

Surface-water and groundwater interactions in the Big Lost River, south-central Idaho

Dudunake¹,

Zinsser²

2021

This is the second of three reports in a multichapter volume characterizing water resources in the Big Lost River Basin. These reports document the findings of a hydrogeologic investigation of the Big Lost River Basin that was jointly conducted by the U.S. Geological Survey, Idaho Department of Water Resources, and the Idaho Geological Survey from 2018 through 2021. Chapter A (Zinsser, 2021) describes the hydrogeologic framework of the Big Lost River Basin. It includes a conceptual definition of the hydrogeologic units, a three-dimensional hydrogeologicframework model, and a description of groundwater occurrence and movement. Chapter B (this report) describes streamflow gains from and losses to groundwater in the Big Lost River between Mackay Reservoir and south of Arco, Idaho. Streamflow gains and losses were estimated from a series of four surface-water measurement events during pre-and post-irrigation season conditions from 2019 to 2021. Chapter C will describe groundwater budgets for the Big Lost River Basin from 2000 to 2019. The groundwater budgets will provide annual estimates for aquifer inflows and outflows. Collectively, these reports present a characterization of water resources in the Big Lost River Basin that will help address current challenges in water-resource management.