A Conceptual Model of Ground-Water Flow in the Eastern Snake River Plain Aquifer at the Idaho National Laboratory and Vicinity with Implications for Contaminant Transport

Scientific Investigations Report 2006-5122

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5122

Table 6. Ground-water budget for the conceptual model area for 1980 and derived from the Regional Aquifer System Analysis (RASA) model of the Snake River Plain aquifer, Idaho.

[Data from sources listed in “Inflows, Outflows, and Fluxes Across Model Boundaries” section. Flow values are in cubic feet per second (ft³/s). Percentage rounded to nearest 1 percent; sum of inflows may not equal sum of outflows because of independent calculation of flows from various data sources, resulting in a budget residual. Values derived from RASA (Garabedian, 1992) model simulation output for a transient-state three-dimensional regional flow model for 1976-80. Symbol: <, less than]

Inflow	1980 (this report)		Derived from RASA model
Inflow	Flow	Percentage of total	Flow	Percentage of total
Water-table boundary
Precipitation recharge	70	3	157	6
Big Lost River infiltration recharge	95	4	101	4
Little Lost River infiltration recharge	0	0	17	1
Industrial wastewater return	6	<1	0	0
Irrigation infiltration	24	1	0	0
Change in storage	80	4	145	6
Base of the aquifer	44	2	0	0
Northwest mountain-front boundary
Big Lost River underflow	367	16	366	15
Little Lost River underflow	226	10	212	8
Birch Creek underflow	102	5	103	4
Mountain-front underflow	0	0	48	2
Northeast boundary	1,225	55	1,207	47
Southeast-flowline boundary	0	0	194	8
Total	2,239	100	2,550	100
Percentage difference, 1980 and RASA inflow	14
Outflow
Water-table boundary
Ground-water withdrawals			124	5
Irrigation	37	2
Industrial	8	<1
Southwest boundary	2,037	98	2,427	95
Total	2,082	100	2,551	100
Budget residual	157		1
Percentage difference between inflow and outflow		7		0
Percentage difference, 1980 and RASA outflow	23

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