I have no idea what physical system you are dealing with, but with no data except nitrate, I think all you can consider is a simple mass-balance model: nitrate = nitrate_in - nitrate_out - consumption. Perhaps you have enough data to fit a first order decay constant for consumption. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 "Vinson, Janie" <Janie_Vinson@xxx To: "'dlpark@xxxxxxxx'" <dlpark@xxxxxxxx>, "'nplummer@xxxxxxxx'" thtech.com> <nplummer@xxxxxxxx> cc: In-Reply-To: <FC461288E0BAD5119BCE00306E00411C7D177B@xxxxxxxxx> 02/05/02 01:45 PM Subject: Nitrate Predictions David and Niel, Thanks for your time, I know that you are both very busy. Your student in 1998, I hope that you will have an answer to a rather simplistic question: what model to use to predict nitrate levels over the long term (years)? The data could be as minimalistic as only nitrate concentrations (no alkalinity, etc.), so my next question: what is the minimal amount of data necessary to run the model of choice? Obviously, efficiency is a primary factor. Any help/guidance is greatly appreciated_ Janie
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