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