| Changes
--- | ---

The following list describes all changes made on GREAT-ER since the first release at March, 15th, 1999.

## Changes from version 1.0.2 to 1.0.3

1. Generation of dBase files 10/09/2000
2. Rur catchment 12/02/2001

    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.

## Changes from version 1.0.1 to 1.0.2

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.

## Changes from version 1.0.0 to 1.0.1

1. New simulator 26/04/1999
2. Background Concentration 07/05/1999
3. Csim Classes River 10/05/1999
4. Documentation 10/05/1999
5. Itter Data Update 10/05/1999

    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

For general information see the GREAT-ER Documentation.