What's new?
The last modifications brought up to version 4.0 ease and improve largely its use. The main changes to version 4.0 are: 

Language management
CEQUEAU model Version 4.0 offers a choice of language for windows on the screen and of printed graphs. The languages presently available are: English, Spanish, French, Polish and Portuguese. The choice of language is easily done with the help of "Preference" menu  in "Project".

Temporal step
CEQUEAU model Version 4.0  allows a simulation choice according to temporal steps: 2, 2, 3, 4, 6, 8, 12 or 24 hours.

Forecasting in real time
CEQUEAU model was modified in order to introduce various options which allow forecasting of flow rates in real time along with updating. The options now available are:

Short-term forecasting
• forecasting without updating whereby forecast meteorological data are introduced as input to CEQUEAU model. In this manner, the simulated flow rates become forecast flow rates;

• forecasting with statistical updating whereby flow rates are simulated forecast meteorological data and corrected thereafter if required. This correction is undertaken as a function of  residuals between observed and simulated flow rates for days before the forecasting period. The statistical
updating parameters are the auto-correlation coefficients of residuals (observed minus simulated flow rates) for orders ranging from 1 to the number of forecasting temporal steps. These parameters are easily determined with CEQUEAU model;

• forecasting with deterministic updating whereby flow rates are simulated up to the beginning of the forecasting period. Water volumes in the reservoirs are thereafter corrected as a function of the difference between observed and calculated flow rates for the days preceding the start of the forecasting period. Forecast meteorological data are herein introduced as input data for CEQUEAU model to obtain forecast flow rates. Three (3) deterministic updating parameters are required for this purpose. CEQUEAU model allows an easy determination of these parameters through optimisation;

• forecasting with manual updating whereby flow rates are simulated with CEQUEAU model until the beginning of the forecasting period and shows a graph of both observed and simulated flow rates on the screen. If flow rates are inaccurate, one (1) or more of the six (6) variables are changed to improve the quality of the simulation. In this case, new  calculations are carried out with CEQUEAU model and another graph of observed and simulated flow rates appears on the screen. This process is repeated until the results are judged satisfactory; forecasting is then undertaken with the introduction of forecast meteorological data as input to the model. This
operation is performed easily using CEQUEAU model with the aid of a user friendly interface allowing a presentation on the screen of each of the six (6) variables selected for manual updating. 

Mid-term forecasting
CEQUEAU model allows mid-term forecasting after short-term forecasting using either deterministic or manual updating. To do so, CEQUEAU model uses historical meteorological data available on the watershed; in this fashion, an estimate of mid-term flow rates for varying probability levels, taking into account the water volumes in the reservoirs at the end of the
short-term forecasting period, is obtained. 

Miscellaneous
In its actual version, CEQUEAU model can deal simultaneously with many watersheds 
 and offers an increasing number of graph types which favours a better analysis of the 
 results and improve decision making. In addition, it is now possible to introduce a space domain variation of  the main parameters of the production function. 

Obtain more information on CEQUEAU.

Download demo version 4.0 for Windows 3.1, Windows 95/98.
Last revision: April 20th, 2000 

Webmestre  Sophie Renaud , Guy Morin & Maurice Seguin