As requested, our hydrologists Stan Leake, Jesse Dickinson, Don Pool, and Nick Paretti have conducted a technical review of SWCA draft memorandum "Refined approaches to streamflow predictions." The memorandum documents an analysis of the potential impacts of the Rosemont mine on the hydrology of Cienega Creek, Empire Gulch, and Gardner Canyon. The potential impacts described in the report are changes in stream-flow discharge and number of days with zero flow. The approach included regression models with groundwater level as the explanatory variable and stream flow discharge as the response variable. Projected groundwater levels from numerical groundwater models are used to predict future changes in stream flow in the streams.
U.S. Geological Survey. 2014e. Technical Review of SWCA draft memorandum "Refined approaches to streamflow predictions". In Letter from James Leenhouts, Director, USGS Arizona Water Science Center, to Jim Upchurch, Forest Supervisor, Coronado National Forest. Tucson, Arizona: U.S. Geological Survey. September 30.