Precipitation and Runoff Simulations of the Carson Range and Pine Nut Mountains, and Updated Estimates of Ground-Water Inflow and the Ground-Water Budgets for Basin-Fill Aquifers of Carson Valley, Douglas County, Nevada, and Alpine County, California

Scientific Investigations Report 2007–5205

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5205

Table 6. Mean annual ground-water inflow to basin-fill deposits of Carson Valley simulated with watershed models, water years 1990–2002, and compared with mean annual inflow simulated during dry conditions, water years 1990–92, and wet conditions, water years 1995–97, Nevada and California.

{Values are rounded to two significant figures. Mean annual ground-water inflow, dry conditions: If MAG is mean annual ground-water inflow, percent difference calculated as 100*(MAG_{dry conditions}–MAG_1990–2002/MAG_1990–2002; wet conditons: If MAG is mean annual ground-water inflow, percent difference calculated as 100*(MAG_{wet conditions}–MAG_1990–2002/MAG_1990–2002. Abbreviations: acre-ft, acre-feet]

Ground-water inflow source	Simulated mean annual ground-water inflow
	Water years 1990–2002 (acre-feet)	Dry conditions, water years 1990–92		Wet conditions, water years 1995–97
	Water years 1990–2002 (acre-feet)	(acre-ft)	(Percent difference)	(acre-ft)	(Percent difference)
Carson Range
Ground-water inflow from watersheds
Perennial	¹6,200	3,400	-45	9,900	60
Ephemeral	²3,500	1,200	-66	5,200	49
Infiltration of ephemeral runoff	³9,400	2,600	-72	17,000	81
Subtotal (rounded)	19,000	7,200	-62	32,000	68
Pine Nut Mountains
Ground-water inflow from watersheds
Perennial	¹8,200	100	-99	21,000	156
Ephemeral	²5,700	0	-100	18,000	216
Infiltration of ephemeral runoff	⁴2,100	470	-78	4,800	128
Subtotal (rounded)	16,000	570	-96	44,000	175
Total for Carson Range and Pine Nut Mountains
Total (rounded)	35,000	7,800	-78	76,000	117

¹ From table 4.

² From table 5.

³ From table 5, simulated mean annual ephemeral runoff, 9,900 acre-ft, less 5 percent loss to evapotranspiration, 500 acre-ft.

⁴ From table 5, plus runoff of Pine Nut and Buckeye Creeks, less 5 percent loss to evapotranspiration.

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