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The following list describes all changes made on GREAT-ER since the first release at March, 15th, 1999.
1. On Sunday, 10/09/2000, the GREAT-ER 1.0 user and developer group at the Institute of Environmental Systems Research encountered a bug in the GREAT-ER dbase file generation. The bug was fixed by adding a corrected version of the dBase generation binary to the CD. 2. As part of the Ph.D. project of Carsten Schulze (Institute of Environmental Systems Research), the integration of the catchment data of the Rur catchment, located in Western North-Rhine Westfalia, was conducted. Two Rur catchment datasets have been included within this project, one containing the discharge-site data from 1993, the other containing the discharge-site data from 2000. The datasets include all data required for a simulation. In addition, monitoring data for a variety of substances as well as hydrological data and some background information are included. The data were provided by different organisations. The river network is based on the Feines Gewässernetz Deutschland provided by the German Federal Environmental Agency (Umweltbundesamt, UBA). The discharge-site and hydrological data are provided by the regional water authorities Wasserverband Eifel-Rur (WVER) and by the North Rhine-Westphalia State Environmental Agency (Landesumweltamt, LUA). The monitoring data are provided by Henkel KGaA and the LUA.
28/02/2000
A number of procedures has been adapted to handle concentrations of very low values. For simulation results with both, rather high (10^8) and rather low values, numbers as low as 10^-12 (pico-gramme per liter) are available. For simulations with less high maximum values, small numbers numbers less than 10^-30 are possible.
1. A bug was found within the simulator concerning the correlation between flow and flow velocity. The bug fix performed by G. Boeije was included in CDs/distributionen/greater/models/simul. 26/04/1999 2. Opening another substance while simulation results are displayed including background concentration did not delete the background concentration. This problem has been resolved. Loading another substance will automatically launch a dialog if any site-specific substance data were entered for the current scenario. The user is informed by a dialog about the situation and prompted whether to delete or keep the data (deleting the default). Furthermore, the simulation results are entirely delete when loading another substance. Changing the background concentration after a successful simulation will also remove the previous simulation results. 07/05/1999 3. The calculation of Csim classses for rivers (Analysis menu) causes an error on installations with relatively long path names due to fixed string length. This limitation was debugged. 10/05/1999 4. Documentation: - all PNG (portable network graphics) files were converted to GIF since some older browsers can not display PNG files. - a HTML file "documentation.html" was added to the doc directory providing the user a more comfortable access on the GREAT-ER documentation 10/05/1999 5. Update on Itter-Data: Some data for the sewage treatment plants in the catchment of River Itter have been updated (values of 1996), namely connected population and non-domestic flow. 10/05/1999