Recharge sources and residence times of groundwater as determined by geochemical tracers in the Mayfield Area, southwestern Idaho, 2011–12

Abstract

Inch/Pound to SI Multiply By To obtain Length inch (in.) 2.54 centimeter (cm) foot (ft.) 0.3048 meter (m) mile (mi) 1.609 kilometer (km) Flow rate cubic foot per second (ft 3 /s) 0.02832 cubic meter per second (m 3 /s) Hydraulic gradient foot per mile (ft/mi) 0.1894 meter per kilometer (m/km) Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:°F =(1.8×°C)+32 Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows: °C=(°F-32)/1.8 Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25 °C). Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). Datums Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Altitude, as used in this report, refers to distance above the vertical datum.

Isotopic composition of precipitation in a topographically steep, seasonally snow-dominated watershed and implications of variations from the global meteoric water line

“…Two regional studies (Schlegel et al , ; Hopkins, ) previously used the stable isotopes of water to investigate hydrologic and paleoclimatic processes in southwestern Idaho. The stable isotope composition of groundwater was used as a surrogate for the isotope composition of precipitation to investigate the paleo‐climate record of the Boise area.…”

“…The stable isotope composition of groundwater was used as a surrogate for the isotope composition of precipitation to investigate the paleo‐climate record of the Boise area. Recharge sources and residence times of groundwater were determined near Mayfield, ID (25 miles SW of Boise, ID) by isotope tracer and other geochemical methods (Hopkins, ). Both studies would have benefited from a robust LMWL, and future isotope‐based investigations in the area will be improved by the production of a LMWL for the Boise area.…”