Adaptive Rainfall-Runoff Model, SATT-1

The rainfall—runoff model SATT—I is introduced. In the model soil moisture can be treated in a physically based or in a conceptual way. Similarly, flood routing can be calculated either by using St. Venant’s equations or by using the Muskingum method. The latter is also used in the timing of direct runoff. The regulation routines for lakes and reservoirs are versatile and applicable to all practical cases. The model has 10 calibrable parameters whose values can be searched with an automatic calibration using the siplex algorithm. The model is provided with an adaptive calibration system which improves the accuracy of forecasts as new data are available. After presentation of the model some practical applications to the Kyrönjoki river basin in Western Finland are given.