> I am about to calculate the effect of storing water in an aquifer for later withdrawal. Previous modellers seemed to have used something called CHILLER, which I cannot find. Chiller was written by Mark Reed and could probably do the calculations you need. It was designed to model high temperature waters that cool as the water moves up a well, however, it should be adequate for your application as well. I'm not sure where to go to get the code. > I see you list ASR as a possible application of PHREEQC. Can I include in the mixing of the two waters, things like O2 and CO2 degassing / reactions? PHREEQC can handle 1D advective/dispersive transport with chemical reactions, including mineral and gas equilibria, ion exchange, surface complexation, and kinetic reactions. It is possible to model flow in one direction followed by flow in the other direction. It is possible to use radial coordinates for ASR-type calculations. There are general mixing capabilities, but I'll admit that this part could get tricky to implement correctly. Fixed partial pressures of O2 and CO2 in specified cells is easy to implement. PHREEQC is a good tool to check out the chemical effects of reaction and transport. It also has an inverse modeling capability that can take injected, background, and extracted water and calculate mixing fractions and chemical reactions that account for the composition of the extracted water. I have used the beta version of PHAST, a 3D reactive transport to investigate an ASR experiment in South Carolina. After working out reactions with PHREEQC (inverse and 1D), a full 3D model was implemented. > Any references come to mind where ASR issues have been directly addressed. A USGS conference on ASR was held in April. An open file report from the conference may be available from the USGS, Water Resources Division, Office of Ground Water. The report is: U.S. Geological Survey Artificial Recharge Workshop Proceedings, Sacramento, California, April 2-4, 2002, U.S. Geological Survey Open-File Report 02-89. The report covers many aspects of ASR and has some case studies. I have a report in the volume on the Charleston work that is included below as a Word document. David (See attached file: parkhurst.doc) David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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