Application of the solute-transport models OTIS and OTEQ and implications for remediation in a watershed affected by acid mine drainage, Cement Creek, Animas River basin, Colorado.

Instream zinc concentrations were depicted by OTIS (One-dimensional-Transport with Inflow and Storage) and it was also used to simulate the effect of two remediation scenarios on zinc concentrations at the mouth of Cement Creek. The Creek is dominated by inflows of natural and mining-related low-pH water. Preliminary simulations using the reactive solute-transport model OTEQ (OTis with EQuilibrium calculations) to account for instream pH changes were unsuccessful due to the partial nature of the mixing processes and lack of information on the thermodynamic properties of precipitates forming in mixing zones.
Instream zinc concentrations were depicted by OTIS (One-dimensional-Transport with Inflow and Storage) and it was also used to simulate the effect of two remediation scenarios on zinc concentrations at the mouth of Cement Creek. The Creek is dominated by inflows of natural and mining-related low-pH water. Preliminary simulations using the reactive solute-transport model OTEQ (OTis with EQuilibrium calculations) to account for instream pH changes were unsuccessful due to the partial nature of the mixing processes and lack of information on the thermodynamic properties of precipitates forming in mixing zones.